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    Wyświetlanie 1-73 z 73
    Tytuł:
    Corrosion Behaviour Correlation of the Secondary Aluminium Casts in Natural Atmosphere and Laboratory Conditions
    Autorzy:
    Kuchariková, L.
    Liptáková, T.
    Tillová, E.
    Bonek, M.
    Medvecká, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/352248.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    secondary aluminium alloys
    high Fe content
    corrosion properties
    natural atmosphere
    Opis:
    The secondary aluminium alloys are very important material in actual industry from economic and ecological point of view. The secondary aluminium used for production of casts, however, contains some elements, i.e. iron, – affecting physical, chemical and mechanical behaviour. The subject of our investigation has been corrosion behaviour in natural atmosphere of the hypoeutectic AlSi7Mg0.3 cast alloys with various content of iron, because the Fe content affects not only mechanical properties but corrosion resistance, as well. Three types of the AlSi7Mg0.3 cast alloys were exposed for 9 months in natural atmosphere and the measure of their degradation by corrosion was found by determination of the weight loss and the light microscopy. In addition, a scanning electron microscopy (SEM) analyses and evaluation of surface changes were used. The corrosion behaviour in natural atmosphere was compared to results of the carried out electrochemical and exposure laboratory experiments in chloride solutions.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 4; 1455-1462
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Properties and Morphology of Fly Ash Based Alkali Activated Material (AAM) Paste Under Steam Curing Condition
    Autorzy:
    Razak, Rafiza Abd
    Izman, Sharifah Nur Syamimi Syed
    Abdullah, Mohd Mustafa Al Bakri
    Yahya, Zarina
    Abdullah, Alida
    Mohamed, Rosnita
    Powiązania:
    https://bibliotekanauki.pl/articles/28099518.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    alkali activated material
    AAM
    geopolymer
    fly ash
    steam-cured
    high-Fe
    Opis:
    This paper details the properties, microstructures, and morphologies of the fly ash-based alkali-activated material (AAM), also known as geopolymers, under various steam curing temperatures. The steam curing temperature result in subsequent high strengths relative to average curing temperatures. However, detailed studies involving the use of steam curing for AAM remain scarce. The AAM paste was prepared by mixing fly ash with an alkali activator consisting of sodium silicate (Na2SiO3) and sodium hydroxide (NaOH). The sample was steam cured at 50°C, 60°C, 70°C, and 80°C, and the fresh paste was tested for its setting time. The sample also prepared for compressive strength, density, and water absorption testings. It was observed that the fastest time for the fly ash geopolymer to start hardening was at 80°C at only 10 minutes due to the elevated temperature quickening the hydration of the paste. The compressive strength of the AAM increased with increasing curing time from 3 days to 28 days. The AAM’s highest compressive strength was 61 MPa when the sample was steam cured at 50°C for 28 days. The density of AAM was determined to be ~2122 2187 kg/m3, while its water absorption was ~6.72-8.82%. The phase analyses showed the presence of quartz, srebrodolskite, fayalite, and hematite, which indirectly confirms Fe and Ca’s role in the hydration of AAM. The morphology of AAM steam-cured at 50°C showed small amounts of unreacted fly ash and a denser matrix, which resulted in high compressive strength.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 2; 785--789
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surface Treatment Effect on Bulk Magnetoelastic Properties of High Damping Fe-Based Alloys
    Autorzy:
    Chudakov, I. B.
    Udovenko, V. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1945271.pdf
    Data publikacji:
    1996-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    62.40.+i
    75.50.Bb
    75.60.Ej
    75.80.+q
    Opis:
    Binary and complex alloyed high damping steels on the base of Fe-Cr and Fe-Al systems was investigated. It was shown that already slight surface treatment leads to the increase in magnetic anisotropy of the material and to the decrease in damping capacity.
    Źródło:
    Acta Physica Polonica A; 1996, 89, 3; 425-430
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Accents in Modern High Saturation Nanocrystalline Fe-Rich Alloys
    Autorzy:
    Butvinová, B.
    Butvin, P.
    Maťko, I.
    Janičkovič, D.
    Kuzminski, M.
    Ślawska-Waniewska, A.
    Švec, P.
    Chromčíková, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030276.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Bb
    75.60.-d
    75.75.-c
    Opis:
    Post processing limits for iron-rich Fe-Cu-Si-B-P high-induction rapidly-quenched ribbons have been tested. 530°C/20 min is already too much, formed borides being the essential culprit of magnetic properties deterioration. Unlike standard Si-poor Fe-Nb-Cu-B-Si Finemets, these alloys annealed even in "technical" Ar below the upper limit do not create significant squeezing surfaces.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 711-713
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    XRD and morphology analyzes of high-nitrogen Fe-Cr-Mn alloy powders synthesized by mechanical alloying
    Autorzy:
    Romańczuk, E.
    Oksiuta, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/285796.pdf
    Data publikacji:
    2016
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    biomaterials
    morphology
    XRD analysis
    Źródło:
    Engineering of Biomaterials; 2016, 19, 138; 95
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High-Quality Ni-Fe/Cu Multilayer Films with Antiferromagnetic Coupling
    Autorzy:
    Stobiecki, F.
    Dubowik, J.
    Luciński, T.
    Szymański, B.
    Rohrmann, H.
    Röll, K.
    Schmidt, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1955455.pdf
    Data publikacji:
    1997-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Tt
    76.50.+g
    Opis:
    We report structural and magnetic properties of Ni$\text{}_{83}$Fe$\text{}_{17}$/Cu multilayer films with various buffer layer and sublayer thicknesses of copper d$\text{}_{Cu}$ and Permalloy d$\text{}_{Py}$ deposited by face-to-face sputtering. The following features prove a good quality of our films: a well-layered structure, complete antiferromagnetic coupling with a low coupling strength (2×10$\text{}^{-5}$ J/m$\text{}^{2}$ for d$\text{}_{Cu}$=1 nm and 10$\text{}^{-6}$ J/m$\text{}^{^2}$ for d$\text{}_{Cu}$=2.1 nm) and a low coercive field which make them attractive for possible applications as giant magnetoresistance sensors.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 2; 277-280
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Synthesis and Properties of High Surface Area $Fe_{2}O_{3}$ Materials
    Autorzy:
    Surowiec, Z.
    Gac, W.
    Wiertel, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1506442.pdf
    Data publikacji:
    2011-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.80.+y
    78.67.Bf
    78.67.Rb
    75.20.-g
    Opis:
    Two types of the silica materials were used for the preparation of iron oxides. The MCM-48 type silica support and wide-pore silica gel were impregnated with iron nitrates. The samples were investigated by the nitrogen adsorption/desorption method, X-ray diffraction, scanning electron microscopy, and $\text{}^{57}Fe$ Mössbauer spectroscopy. Redox properties were studied by the temperature programmed reduction method. Strongly dispersed hematite was evidenced on the supports. An application of the MCM-48 silica mesoporous materials led to the development of the oxide phases within the ordered porous structure. The detailed temperature programmed reduction studies evidenced slight differences of the redox properties of the species located within the silica templates and after their removal. Magnetic properties of iron oxides were related to the porous structure of the silica supports. The Mössbauer study of high surface area materials Fe/$SiO_{2}$ and Fe/MCM-48 type silicate templates revealed existence of ferro- and superparamagnetic phases. The relative contribution of the superparamagnetic doublet component in Mössbauer spectra is 15% and 80% for Fe/$SiO_{2}$/c and Fe/MCM-48/c samples, respectively.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 1; 18-20
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    X-ray diffraction and EBSD study of Al-Ti-Co-Ni-Fe high-entropy alloy
    Autorzy:
    Górecki, K.
    Bała, P.
    Cios, G.
    Stępień, M.
    Kozieł, T.
    Wieczerzak, K.
    Tokarski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1153214.pdf
    Data publikacji:
    2016-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.30.-t
    61.05.C-
    68.37.Hk
    61.66.Dk
    Opis:
    Al₁₅Ti₂₀Co₂₀Ni₂₅Fe₂₀ alloy, synthesized in an arc furnace, was characterized by microscopic investigations, X-ray diffraction and electron backscatter diffraction techniques. Theoretical assumptions indicate a dual-phase crystal structure fcc+bcc. It was shown that dendrites and eutectic are bcc phase, and the interdendritic region is fcc phase.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 4; 991-992
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrical and Magnetic Properties of Selected Fe-Based High Entropy Alloys
    Autorzy:
    Perzyńska, K.
    Go, A.
    Szymański, K.
    Biernacka, M.
    Hawełek, Ł.
    Kalska-Szostko, B.
    Oleszak, D.
    Rećko, K.
    Waliszewski, J.
    Zaleski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1375573.pdf
    Data publikacji:
    2014-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.23.-k
    71.55.Ak
    72.15.-v
    72.15.Eb
    75.50.Bb
    82.80.Ej
    Opis:
    The electrical and magnetic properties of $Fe_{0.5}A_{0.5}$ alloys are presented, where the A corresponds to various compositions of the elements: A = (Al, Si, V, Cr, Co, Ga, Ni, Ge). The system is closely related to the known family of high entropy alloys. The samples were synthesized by arc melting and/or melt spinning technique and exhibit a regular type of crystal structure. Lattice parameters are systematically smaller than the estimates based on metallic radiuses of the elements. Temperature dependences of resistivities show maxima for some compositions. This behavior is consistent with results of electronic structure calculations, where a low density of states at the Fermi level were predicted. Also the measured magnetic moments are in good agreement with results of calculations. It is thus presented that some physical properties can be designed by appropriate choice of the chemical composition within the same simple structure.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 4; 999-1004
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cavitation Erosion Resistance of High-Alloyed Fe-Based Weld Hardfacings Deposited Via SMAW method
    Odporność na erozję kawitacyjną wysokostopowych twardych powłok napawanych na osnowie żelaza wytworzonych metodą SMAW
    Autorzy:
    Szala, Mirosław
    Hejwowski, Tadeusz
    Powiązania:
    https://bibliotekanauki.pl/articles/2200626.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    cavitation erosion
    hard facing
    pad welding
    wear mechanism
    roughness
    hardness
    erozja kawitacyjna
    napawanie utwardzające
    mechanizm zużycia
    chropowatość
    twardość
    Opis:
    In order to investigate the cavitation erosion (CE) resistance of high-alloyed ferrous hardfacings, the three different deposits were pad welded by the shielded metal arc welding (SMAW) method. Consumable electrodes differed in the content of carbide-forming elements, and pad welds were deposited onto the S235JR structural. The CE tests, conducted according to ASTM G32 standard, indicated that hardfacings reveal lower mass loss than the reference stainless steel AISI 304 (X5CrNi18-10). The hardfacings show increasing resistance to CE in the following order: Cr-C < Cr-C-Mo < Cr-C-Mo-V-W. The reference steel revealed more than twenty times higher material loss in the CE test than Cr-C-Mo-V-W hardfacing, which had outstanding hardness (825HV0.3). The profilometric measurements and scanning electron microscopy investigations showed large changes in valley and peak sizes of the roughness profiles for materials which displayed high erosion rates. The erosion mechanism of the coatings can be classified as brittle-ductile and relies on cracking, chunk removal of material, pits and craters formation, and deformation of fractured material tips and edges. Hardfacing materials failed primarily due to brittle fractures with different severities. Specimen surface degradation follows the changes in Ra, Rz, Rv, and Rp roughness parameters and well-corresponds to the proposed roughness rate (RR) parameter.
    W celu zbadania odporności na erozję kawitacyjną (EK) wysokostopowych napoin na osnowie żelaza napawano trzema materiałami metodą SMAW. Elektrody otulone różniły się zawartością pierwiastków węglikotwórczych. Napoiny wykonano na stali konstrukcyjnej S235JR. Testy EK, przeprowadzone zgodnie z normą ASTM G32, wykazały niższy ubytek masy napoin w porównaniu do referencyjnej stali odpornej na korozję AISI 304 (X5CrNi18-10). Napoiny wykazują rosnącą odporność na EK w następującej kolejności: Cr-C < Cr-C-Mo < Cr-C-Mo-V-W. Referencyjna próbka stalowa wykazała w teście EK ponad dwudziestokrotnie większy ubytek materiału niż napoina Cr-C-Mo-V-W, która miała wyjątkowo wysoką twardość (825HV0.3). Pomiary profilometryczne i badania przeprowadzone przy użyciu skaningowego mikroskopu elektronowego wykazały duże zmiany wielkości dolin i szczytów profilu chropowatości dla materiałów wykazujących wysoką szybkość erozji. Mechanizm EK powłok można sklasyfikować jako krucho-plastyczny i opiera się na pękaniu, usuwaniu kawałków materiału, tworzeniu wgłębień i kraterów oraz deformacji pękniętych fragmentów kraterów oraz deformacji wyodrębnionych szczytów i krawędzi materiału. Napawany materiał podlega niszczeniu przez jego pękanie w różnym nasileniu. Degradacja powierzchni próbek pogłębia się wraz ze zmianą parametrów chropowatości Ra, Rz, Rv i Rp i dobrze koresponduje z proponowanym parametrem RR (zmiana chropowatości pow. degradowanej).
    Źródło:
    Tribologia; 2022, 4; 85--94
    0208-7774
    Pojawia się w:
    Tribologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High-coercivity Nd-Fe-B Powders Obtained by High-Temperature Milling
    Wysokokoercyjne proszki Nd-Fe-B otrzymywane przez mielenie w wysokiej temperaturze
    Autorzy:
    Kaszuwara, W.
    Michalski, B.
    Orlowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/355400.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    hard magnetic materials
    Nd-Fe-B
    mechanical alloying
    mechanical milling
    twarde materiały magnetyczne
    mechaniczna synteza
    obróbka mechaniczna
    Opis:
    The possibility of employing high temperature milling (600°C) for the production of highly coercive Nd-Fe-B powders was examined. The materials were the Nd12Fe82B6, alloy which was subjected to mechanical milling and the powders of the constituent elements of this alloy which were processed by mechanical alloying. The processes were conducted in the two variants: the first variant consisted of mechanical milling performed at a high temperature which was maintained during the entire process, and the other variant included preliminary milling carried out at room temperature and then the milling temperature was increased. All the processes gave nanocrystalline powders with hard magnetic properties. The powders produced by mechanical milling had better properties than those produced by mechanical] alloying as they were more homogeneous and contained smaller amounts of the α-Fe phase.
    W pracy badano możliwości zastosowania procesu mielenia w wysokiej temperaturze (600°C) do otrzymywania wyso- kokoercyjnych proszków Nd-Fe-B. Mieleniu poddano stop Nd12Fe82B6,. a także zastosowano metodę mechanicznej syntezy stopów tzn. mielono proszki pierwiastków składników stopu. Procesy prowadzono w dwóch wariantach: cały proces odbywał się w podwyższonej temperaturze lub stosowano wstępne mielenie w temperaturze pokojowej, a następnie mielenie w wysokiej temperaturze. We wszystkich procesach uzyskano nanokrystalicze proszki o właściwościach magnetycznie twardych Proszki uzyskane w procesie mielenia stopu miały właściwości lepsze od proszków otrzymanych w procesie mechanicznej syntezy stopów, ponieważ były bardziej jednorodne i posiadały mniejszy udział fazy α-Fe.
    Źródło:
    Archives of Metallurgy and Materials; 2014, 59, 1; 47-50
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructural Changes in a High-Manganese Austenitic Fe-Mn-Al-C Steel
    Zmiany mikrostrukturalne w wysokomanganowej stali austenitycznej Fe-Mn-Al-C
    Autorzy:
    Witkowska, M.
    Zielińska-Lipiec, A.
    Kowalska, J.
    Ratuszek, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/350948.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high-manganese austenitic steel hot-rolling
    spinodal decomposition
    carbides
    microstructure
    wysokomanganowa stal austenityczna
    rozpad spinodalny
    węgliki
    mikrostruktura
    Opis:
    Microstructural changes in the age-hardenable Fe-28wt.%Mn-9wt.%Al-1wt.%C steel during ageing at 550°C for various times have been investigated by transmission electron microscopy (TEM) and X-ray diffraction (XRD). The steel was produced in an induction furnace and the ingot, after homogenization at 1150°C for 3 hours under a protective argon atmosphere, was hot-rolled and subsequently cold-rolled up to 23% reduction. The sheet was then aged at 550°C for various times in an argon atmosphere and cooled in air. XRD analysis and TEM observations revealed a modulated structure and superlattice reflections produced by spinodal decomposition, which occurred during ageing at 550°C. Theexistence of satellites suggests that either (Fe, Mn)3AlCx carbides were formed within the austenite matrix by spinodal decomposition during cooling or chemical fluctuactions occurred between the (Fe, Mn)3AlCx carbides and the austenitic matrix.
    W pracy analizowano zmiany mikrostruktury w stali Fe-28%wt. Mn-9%wt. Al-1%wt.C zachodzące podczas starzenia w temperaturze 550°C w różnych czasach. Stal Fe-28Mn-9Al-1C wytopiono w próżniowym piecu indukcyjnym. Po odlaniu wlewek homogenizowano w temperaturze 1150°C przez 3 godziny w atmosferze argonu. Wlewek walcowano na gorąco a następnie na zimno do 23 % odkształcenia. Próbki po odkształceniu starzono w temperaturze 550°C dla różnych czasów w atmosferze argonu i chłodzono na powietrzu. Obserwacje elektronomikroskopowe starzonej stali Fe-28Mn-9Al-1C ujawniły modulowaną strukturę i refleksy od nadstruktury, co było efektem rozpadu spinodalnego, który miał miejsce podczas procesu starzenia. Występowanie satelitów na zapisach dyfrakcyjnych sugeruje, że węgliki (Fe, Mn)3AlCx powstały w osnowie austenitycznej na skutek rozpadu spinodalnego zachodzącego podczas chłodzenia czy fluktuacji chemicznych występujących pomiędzy węglikami Fe, Mn)3AlCx i osnową austenityczną.
    Źródło:
    Archives of Metallurgy and Materials; 2014, 59, 3; 971-975
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wysokotemperaturowe własności tribologiczne stopów Fe-Al
    High temperature tribological properties of Fe-Al alloys
    Autorzy:
    Śleboda, T.
    Krawczyk, J.
    Zimowski, S.
    Kot, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/189298.pdf
    Data publikacji:
    2012
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    stopy Fe-Al
    zużycie
    współczynnik tarcia
    Fe-Al alloys
    wear
    friction coefficient
    Opis:
    W niniejszej pracy poddano dyskusji wysokotemperaturowe własności tribologiczne stopów Fe-Al. Jako materiał wyjściowy do badań zastosowano stop FeAl w formie odlewu oraz otrzymany z proszku stopu. Analizie został poddany wpływ rodzaju stopu na jego własności tribologiczne. Badania tribologiczne wykonano w temperaturze 700C w układzie trzpień-tarcza. Określono wielkość zużycia oraz współczynnik tarcia. Dyskusji poddano różnice w mechanizmach zużycia tribologicznego badanych materiałów.
    This research was focused on high temperature tribological properties of Fe-Al alloys. Powder and cast FeAl alloy was used in this study. The influence of the alloy morphology on its tribological properties is discussed. Tribological tests were performed at 700C. Wear and friction coefficients of the investigated materials were analysed. The differences in the mechanisms of the wear of the investigated alloys are also presented.
    Źródło:
    Tribologia; 2012, 3; 209-215
    0208-7774
    Pojawia się w:
    Tribologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Carbides Analysis of the High Strength and Low Density Fe-Mn-Al-Si Steel
    Autorzy:
    Sozańska-Jędrasik, L.
    Mazurkiewicz, J.
    Borek, W.
    Matus, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/351736.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high manganese steels
    triplex
    microstructure
    isolates of carbide
    carbides κ
    M7C3
    EBSD
    Opis:
    The work presents the results of investigations into the structure and phase composition of newly developed high manganese steels of the X98MnAlSiNbTi24-11 and X105MnAlSi24-11 type. The average density of such steels is 6.67 g/cm3, which is 15% lower as compared to typical structural steels. An analysis of phase composition and structure allows to conclude that the investigated steels feature an austenitic γ-Fe(Mn,Al,C) structure with uniformly distributed and elongated α-Fe(Mn,Al) ferrite grains on the boundaries of austenite grains and carbides. Examinations by diffraction of back scattered electrons (EBSD) allow to conclude that high-angle boundaries dominate in such steels, having significant influence on mechanical properties. Three types of carbides with differentiated chemical composition and size were identified in steel X98MnAlSiNbTi24-11 with scanning and transmission electron microscopy. κ-(Fe,Mn)3AlC carbides, having a regular, face-centered cubic lattice (fcc), were identified in austenite. Transmission electron microscopy examinations have enabled to identify M7C3-type carbide in ferrite. Nb- and Ti-based complex carbides were identified in steel X98MnAlSiNbTi24-11, both, in ferrite and austenite. (NbTi)C2 carbide precipitates were confirmed in an X-ray qualitative phase analysis. The size of the above-mentioned carbides is within several to several dozens of μm. An X-ray qualitative phase analysis has confirmed the precipitates of M7C3 carbides in both steels.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 1; 265-276
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure and High Temperature Oxidation Properties of Fe-Cr-Ni HK30 Alloy Manufactured by Metal Injection Molding
    Autorzy:
    Wi, Dong-Yeol
    Kim, Young-Kyun
    Yoon, Tae-Sik
    Lee, Kee-Ahn
    Powiązania:
    https://bibliotekanauki.pl/articles/356708.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metal injection molding
    HK30
    microstructure
    high temperature oxidation
    Opis:
    This study investigated the microstructure and high temperature oxidation properties of Fe-25Cr-20Ni-1.5Nb, HK30 alloy manufactured by metal injection molding (MIM) process. The powder used in MIM had a bi-modal size distribution of 0.11 and 9.19 μm and had a spherical shape. The initial powder consisted of γ-Fe and Cr23C6 phases. Microstructural observation of the manufactured (MIMed) HK30 alloy confirmed Cr23C6 along the grain boundary of the γ-Fe matrix, and NbC was distributed evenly on the grain boundary and in the grain. After a 24-hour high temperature oxidation test at air atmospheres of 1000, 1100 and 1200°C, the oxidation weight measured 0.72, 1.11 and 2.29 mg/cm2, respectively. Cross-sectional observation of the oxidation specimen identified a dense Cr2O3 oxide layer at 1000°C condition, and the thickness of the oxide layer increased as the oxidation temperature increased. At 1100°C and 1200°C oxidation temperatures, Fe-rich oxide was also formed on the dense Cr2O3 oxide layer. Based on the above findings, this study identified the high-temperature oxidation mechanism of HK30 alloy manufactured by MIM.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 2; 525-530
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of the Magnetization Reversal Process of High-Remanent $Nd_{10}Fe_{83}Zr_1B_6$ Alloy in the As-Cast State
    Autorzy:
    Ceglarek, A.
    Płusa, D.
    Dośpiał, M.
    Nabiałek, M.
    Pietrusiewicz, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1429022.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Et
    75.50.Vv
    75.50.Ww
    75.60.Ej
    75.60.Jk
    Opis:
    In this work the magnetic properties of ribbons with composition of $Nd_{10}Fe_{83}Zr_1B_6$ obtained by using the melt-spinning method were studied. From the X-ray diffraction patterns the phase composition was determined. It was found that investigated alloy was composed of α-Fe and $Nd_2Fe_{14}B$ phases. From the peaks broadening the grain sizes of α-Fe and $Nd_2Fe_{14}B$ phases were estimated as equal to 20 nm and 40 nm, respectively. From the recoil curves the reversible $μ_0$ $M_{rev}$ and irreversible $μ_0 M_{irr}$ parts of magnetization and differential susceptibility $χ_{rev}$ and $χ_{irr}$ were determined as a function of an applied field. From these dependences it was found that the pinning of domain walls at the grain boundaries is the main magnetization reversal process. The interactions between grains were investigated by means of the δ M plot. It was stated that short range exchange interaction between grains of hard and soft phases are dominant and causes the remanence enhancement.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 1279-1281
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Żaroodporność i żarowytrzymałość stali typu Fe-Cr-Al w warunkach utleniających; aktualny stan i perspektywy badań
    High temperature behavior of Fe-Cr-Al steel under oxidizing conditions - a review
    Autorzy:
    Homa, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/391670.pdf
    Data publikacji:
    2008
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
    Tematy:
    stal Fe-Cr-Al
    wysokotemperaturowe utlenianie
    zgorzelina Al2O3
    transformacja fazowa
    morfologia powierzchni
    Fe-Cr-Al steel
    high temperature oxidation
    alumina scale
    phase transformation
    surface morphology
    Opis:
    Praca przedstawia krytyczną analizę obecnego stanu wiedzy na temat badań nad żaroodpornością stali typu Fe-Cr-Al z grupy AFA (Alumina Forming Alloys), których zachowanie w środowisku gorących gazów jest od lat przedmiotem wnikliwych badań. W warunkach wysokotemperaturowego utleniania tworzy się na ich powierzchni ochronna warstwa zgorzeliny zbudowana z tlenku glinu, który może występować w różnych odmianach krystalograficznych. Odmiany fazowe mogą ulegać transformacji od niestabilnej fazy γ poprzez δ i θ do stabilnej fazy α. O rodzaju utworzonej fazy decyduje temperatura procesu utleniania, skład atmosfery oraz czas. Przemianom fazowym tlenku glinu towarzyszy zmiana szybkości utleniania stali, ponieważ niestabilne tlenki wykazują wyższe szybkości narastania niż stabilny tlenek α-Al2O3. Dodatkowo w trakcie transformacji fazowej obserwuje się zmiany morfologii powierzchni tworzących się zgorzelin. Fazy przejściowe na ogół występują w postaci płytek, bardzo cienkich długich kryształów (whiskerów) oraz tworów blaszkowych, tworzących silnie rozwinięte powierzchnie, podczas gdy faza α wykazuje budowę kolumnową a utworzona z niej powierzchnia zgorzeliny jest pofałdowana.
    This work reviews the current state of research regarding high temperature oxidation resistance of Fe-Cr-Al steels, that belong to a family of AFA (Alumina Forming Alloys). The behavior of these steels in hot gases environment is a subject of intensive research. During high temperature oxidation, the protective layer of alumina oxide is formed on their surface, which can have different crystallographic forms. Moreover, Al2O3 can transform from instable γ- phase to δ, θ and finally stable α-phase. The type of alumina depends on temperature, time and atmosphere composition. The phase transformation of aluminum oxide is accompanied with change of oxidation kinetics because instable oxides grow faster than unstable ones. Additionally, during phase transformation the morphology change of surfaces is observed. Instable phases have the form of platelets, very long thin crystals (whiskers) and blade-like crystals, in all cases resulting in the formation of highly developed scale surface. Stable α-phase shows columnar crystals construction with corresponding pleated scale surface.
    Źródło:
    Prace Instytutu Odlewnictwa; 2008, 48, 3; 57-85
    1899-2439
    Pojawia się w:
    Prace Instytutu Odlewnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wysokotemperaturowe siarkowanie stali typu Fe-Cr-Al: aktualny stan i perspektywy badań
    High-temperature sulphidation of Fe-Cr-Al steels: the present state of the art and future research
    Autorzy:
    Homa, M
    Powiązania:
    https://bibliotekanauki.pl/articles/391735.pdf
    Data publikacji:
    2008
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
    Tematy:
    zgorzelina
    siarczki
    stale typu Fe-Cr-Al
    siarkowanie
    scale
    sulfides
    Fe-Cr-Al steels
    high temperature sulfidatio
    Opis:
    Praca przedstawia krytyczną analizę obecnego stanu wiedzy na temat badań nad żaroodpornością stali typu Fe-Cr-Al z grupy AFA (Alumina Forming Alloys) w atmosferach siarkujących. Zachowanie się tych materiałów w środowisku gorących gazów jest od lat przedmiotem wnikliwych badań. W warunkach wysokotemperaturowego siarkowania w atmosferach takich, jak gazowa siarka, siarkowodór, gazy spalinowe, merkaptany i inne na powierzchni tych materiałów tworzą się wielowarstwowe zgorzeliny siarczkowe. Warstwy te ze względu na swoją budowę (pęknięcia, szczeliny oraz pustki na granicy zgorzelina/stal) wykazują słabe właściwości ochronne nie zabezpieczając stali przed dalszą degradacją. Skład chemiczny zgorzelin tworzących się w różnych atmosferach siarkowych jest podobny i najczęściej analiza rentgenowska wykazuje obecność siarczków chromu, żelaza oraz glinu, a także sulfospineli. Udział poszczególnych siarczków w poszczególnych warstwach, zależy od rodzaju medium siarkującego, temperatury i czasu ekspozycji oraz składu chemicznego siarkowanego materiału. Wzrost wielowarstwowych zgorzelin siarczkowych odbywa się na drodze odrdzeniowej dyfuzji kationów metalu (Fe, Cr, Al) w strukturze sieci krystalicznej oraz dordzeniowej dyfuzji siarki poprzez nieciągłości w strukturze warstwy.
    This work reviews the current state of research regarding high temperature sulphidation resistance of Fe-Cr-Al steels that belong to a family of AFA (Alumina Forming Alloys). The behavior of these steels in hot gases environment (sulphur, H2S, combustion gases, mercaptans etc.) is a subject of intensive research. During high temperature sulphidation none-protective porous and cracking multilayer scale is formed on their surface. The chemical composition of this scales depends on atmosphere composition. Mostly, the XRD analysis shows that mainly the scales consist of iron, chromium, aluminum sulphides and sulfospinels. The amount of particular sulphides in particular layers depends on atmosphere, temperature, time of sulphidation and chemical composition of the material. The growth of multilayer scales take place by the outward diffusion of metal cations (Fe, Cr, Al) through the defects of the crystal lattice and inward diffusion of the sulphur through the discontinuities in the layer structure.
    Źródło:
    Prace Instytutu Odlewnictwa; 2008, 48, 4; 19-41
    1899-2439
    Pojawia się w:
    Prace Instytutu Odlewnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zagadnienie odlewania elementów ze stopu na bazie Fe-Al pracujących w podwyższonych temperaturach
    The issue of cast parts working at high temperature of an Fe-Al base alloys
    Autorzy:
    Jaskowiec, K.
    Uhl, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/77401.pdf
    Data publikacji:
    2013
    Wydawca:
    Komisja Motoryzacji i Energetyki Rolnictwa
    Tematy:
    staliwo Fe-Al
    zastosowanie
    sklad chemiczny
    zawory silnikowe
    wytrzymalosc na rozciaganie
    odpornosc na utlenianie
    masy formierskie
    Opis:
    Stopy na bazie Fe-Al wykazują cechy predysponujące je do zastosowań w podwyższonych temperaturach. Elementy pieców, rury oraz zawory, które podczas swojej pracy narażone są na działanie agresywnego środowiska, bywają wykonywane z tego tworzywa. Pojawiają się także próby wykorzystania stopu na bazie Fe-Al-Cr na elementy grzejne. Jednak zastosowanie tego materiału wiąże się z wieloma trudnościami. Część z nich została opisana w poniższej publikacji, przedstawiono kilka uwag oraz opis wytopu staliwa na bazie Fe-Al przeprowadzonego w Instytucie Odlewnictwa.
    Fe-Al alloy can be useful at high temperature. Components furnace, pipes and valves, that working at aggressive environment, can make of this alloy. High resistive Fe-Al alloy it reason developing heating elements on this material. Other application is described in this paper as well as casting vanes process for this class of alloys. The influence environment, alloy elements, melting process and other problems on properties is also reviewed
    Źródło:
    Motrol. Motoryzacja i Energetyka Rolnictwa; 2013, 15, 1
    1730-8658
    Pojawia się w:
    Motrol. Motoryzacja i Energetyka Rolnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High-temperature oxidation of Fe40Al5Cr0.2ZrB and TiAl intermetallic phase alloys
    Wysokotemperaturowe utlenianie stopów na osnowie fazy międzymetalicznej Fe40Al5Cr0,2ZrB i TiAl
    Autorzy:
    Cebulski, Janusz
    Powiązania:
    https://bibliotekanauki.pl/articles/41157525.pdf
    Data publikacji:
    2023
    Wydawca:
    Wydawnictwo SIGMA-NOT
    Tematy:
    FeAl
    TiAl
    corrosion
    high-temperature corrosion
    scale
    Al2O3 oxide
    korozja
    korozja wysokotemperaturowa
    zgorzelina
    tlenek Al2O3
    Opis:
    A comparison of high-temperature corrosion resistance was carried out between Fe40Al5Cr0.2ZrB intermetallic phase-based alloy and TiAl alloy by annealing in air at 1000°C for 50 h, 100 h, 200 h, and 500 h. The extent of oxide scale formation on the surface of both alloys was determined and related to the initial surface condition before the oxidation process. The surfaces of both materials were analyzed and compared after the same annealing time. The surface condition before and after oxidation was examined using a stereoscopic microscope. The kinetics of the oxidation process at 1000°C over a period of 500 h were determined. Samples after oxidation were observed using a Hitachi S-4200 scanning electron microscope. Additionally, energy-dispersive X-ray spectroscopy (EDS) was performed to analyze the chemical composition of all tested samples of both materials after oxidation. The relationship between the occurrence of corrosion products for each of the tested materials and the annealing time was demonstrated.
    W pracy dokonano porównania odporności na korozję wysokotemperaturową stopu na osnowie fazy międzymetalicznej Fe40Al5Cr0,2ZrB i stopu TiAl poprzez wyżarzanie w powietrzu w temperaturze 1000°C przez 50 h, 100 h, 200 h i 500 h. Określono powierzchnię zgorzeliny tlenkowej obu stopów i odniesiono te dane do stanu powierzchni przed procesem utleniania. Przeanalizowano i porównano powierzchnie obu materiałów po jednakowym czasie wyżarzania. Badania stanu powierzchni przed utlenianiem i po utlenianiu wykonano za pomocą mikroskopu stereoskopowego. Wyznaczono kinetykę procesu utleniania w temperaturze 1000°C w czasie 500 h. Próbki po procesie utleniania obserwowano przy użyciu elektronowego mikroskopu skaningowego Hitachi S-4200. Przeprowadzono również mikroanalizę rentgenowską składu chemicznego (EDS) wszystkich badanych próbek obu materiałów po utlenianiu. Wykazano zależność między występowaniem produktów korozji każdego z badanych materiałów a czasem wyżarzania.
    Źródło:
    Ochrona przed Korozją; 2023, 6; 170-174
    0473-7733
    2449-9501
    Pojawia się w:
    Ochrona przed Korozją
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High-temperature oxidation of Fe40Al5Cr0.2TiB intermetallic phase-based alloy depending on its surface condition
    Wysokotemperaturowe utlenianie stopu na osnowie fazy międzymetalicznej Fe40Al5Cr0,2TiB w zależności od stanu powierzchni
    Autorzy:
    Cebulski, Janusz
    Powiązania:
    https://bibliotekanauki.pl/articles/41156843.pdf
    Data publikacji:
    2023
    Wydawca:
    Wydawnictwo SIGMA-NOT
    Tematy:
    FeAl alloys
    high-temperature corrosion
    scale
    Al2O3 oxide
    stop FeAl
    korozja wysokotemperaturowa
    zgorzelina
    tlenek Al2O3
    Opis:
    The influence of an FeAl intermetallic phase-based alloy’s surface condition on the high-temperature corrosion process during annealing in air at 1000°C for 500 h was investigated. The structure of the oxide scale was determined and related to the initial surface condition before the oxidation process. Oxidation was observed using a Hitachi S-4200 scanning electron microscope. X-ray microanalysis of the chemical composition (EDS) was also carried out for all the tested samples after oxidation. The relationship between the structure of the oxide scale layer and the type of surface before oxidation was demonstrated.
    W pracy dokonano analizy wpływu stanu powierzchni na przebieg procesu korozji wysokotemperaturowej stopu na osnowie fazy międzymetalicznej FeAl podczas wyżarzania w powietrzu w temperaturze 1000°C przez 500 h. Określono budowę zgorzeliny tlenkowej i odniesiono te dane do stanu powierzchni przed procesem utleniania. Próbki po procesie utleniania obserwowano przy użyciu elektronowego mikroskopu skaningowego Hitachi S-4200. Przeprowadzono również mikroanalizę rentgenowską składu chemicznego (EDS) wszystkich badanych próbek po utlenianiu. Wykazano zależność pomiędzy budową warstwy zgorzeliny tlenkowej a rodzajem powierzchni przed utlenianiem.
    Źródło:
    Ochrona przed Korozją; 2023, 5; 139-142
    0473-7733
    2449-9501
    Pojawia się w:
    Ochrona przed Korozją
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of $Nd_{12}Fe_{82}B_6$ and $Nd_{14}Fe_{80}B_6$ Powders Obtained by High Temperature Milling
    Autorzy:
    Kaszuwara, W.
    Michalski, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1490856.pdf
    Data publikacji:
    2012-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Tt
    75.50.Ww
    81.20.Wk
    Opis:
    The present paper describes a comparison of magnetic properties of $Nd_{12}Fe_{82}B_6$ and $Nd_{14}Fe_{80}B_6$ powders obtained by a new method of processing of Nd-Fe-B powders - high temperature milling. In this method the milling operation is carried out, entirely or only in the final stage, at high temperatures, so that the destruction of the $Nd_2Fe_{14}B$ phase and its recombination occur simultaneously. In this way a powder with good magnetic properties immediately after milling was obtained. In the present experiments, the powder was subjected to high-energy milling for 17 h (until the material becomes amorphous) and then, the milling was continued for 0.5 h with the powder container being heated to an appropriate temperature or milled at high temperature during whole time of the process. Diffraction examinations have shown that the powder processed in this way contains the $Nd_2Fe_{14}B$ phase. Its magnetic properties appear to depend on the applied temperature or milling time (at optimum temperature). The used method of processing leads to obtaining high-coercivity Nd-Fe-B powders. The magnetic properties of the material thus produced, in particular its coercivity, strongly depend on the milling temperature and milling time.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 1; 89-93
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modification of the Surface of the Iron Powder as an Ingredient of the High Calorific Mixture
    Autorzy:
    Czajka, B.
    Wachowski, L.
    Łapiński, A.
    Rzodkiewicz, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/358561.pdf
    Data publikacji:
    2008
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    iron powder
    Fe-KClO4 mixture
    Raman spectroscopy (RS)
    ellipsometry
    thermo-programmed reduction (TPR)
    thermogravimetric analysis
    TG/DTA
    Opis:
    Textural properties of iron powders obtained by reduction of iron(II) compounds and by electrolysis were determined. Their specific surfaces were 0.38 and 0.43 m2g-1 respectively, and the prevailing grain sizes amounted to 10 and 43 ?m respectively. Total content of the determined metallic impurities was 0.055 wt.% in the preparation obtained by the electrolysis while in the preparation obtained by reduction it was 0.025 wt.%. It was proved that in initial samples the α-Fe2O3 phase occurred in the outer oxide layer present on the surface of Fe grains, and below this phase a layer of magnetite was found, the thickness of which was considerably greater in iron obtained by electrolysis. Measurements of selected properties showed that modification of the iron powder surface carried out by reduction with dihydrogen led to decreasing the linear rate of burning of the high calorific mixture Fe/KClO4 but it did not affect its calorific value. Moreover, it was found that modification of the iron powder surface resulted in lowering the temperature of ignition of the analysed mixture and decreasing the quantity of the released oxygen generated by decomposition of the oxidant, which did not react with the iron powder.
    Źródło:
    Central European Journal of Energetic Materials; 2008, 5, 3-4; 87-102
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The structure and properties of magnetic composites based on amorphous Fe alloys
    Autorzy:
    Jeż, Bartłomiej
    Postawa, Przemysław
    Nabiałek, Marcin
    Powiązania:
    https://bibliotekanauki.pl/articles/27311420.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    bulk amorphous alloys
    magnetic composites
    high-temperature isostatic press
    kompozyty magnetyczne
    prasa izostatyczna wysokotemperaturowa
    stop amorficzny
    Opis:
    Materials with so-called soft magnetic properties are an important object of material engineering research due to their potential application, among others, in the construction of low-loss transformer cores. Such properties are typical for alloys with an amorphous structure and with a high content of ferromagnetic elements: Fe, Co, Ni. Difficulties related with obtaining alloys which meet satisfactory dimensions result in the search for new solutions. One of them is the production of composites based on ferromagnetic powders obtained from amorphous alloys. This paper presents results of structure research for composite materials produced in a multi-stage production process. Magnetic composites were made on the basis of a bulk amorphous Fe70B20Y5Nb4Mo1 alloy produced by the injection method. On the basis of the obtained powder, two series of moldings were made: with 0.5% resin and covered with high-temperature varnish. Final composites were produced by using high temperature isostatic press. On the basis of the conducted research, it was found that the composites without resin are characterized by distinctly better magnetic properties as compared to resin-bonded composites.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2023, 71, 4; art. no. e144608
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Fabrication Method of Fe-TiB2 Nanocomposite Powders on Spark-Plasma Sintering Behavior
    Autorzy:
    Bae, Sun-Woo
    Huynh, Xuan-Khoa
    Kim, Ji-Soon
    Powiązania:
    https://bibliotekanauki.pl/articles/351535.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Fe-TiB2 composite
    ex-situ
    in-situ
    iron boride
    titanium hydride
    high-energy ball-milling
    spark plasma sintering
    densification behavior
    Opis:
    In this study, Fe-40wt% TiB2 nanocomposite powders were fabricated by two different methods: (1) conventional powder metallurgical process by simple high-energy ball-milling of Fe and TiB2 elemental powders (ex-situ method) and (2) high-energy ball-milling of the powder mixture of (FeB+TiH2 ) followed by reaction synthesis at high temperature (in-situ method). The ex-situ powder was prepared by planetary ball-milling at 700 rpm for 2 h under an Ar-gas atmosphere. The in-situ powder was prepared under the same milling condition and heat-treated at 900°C for 2 h under flowing argon gas in a tube furnace to form TiB2 particulates through a reaction between FeB and Ti. Both Fe-TiB2 composite powder compacts were sintered by a spark-plasma sintering (SPS) process. Sintering was performed at 1150°C for the ex-situ powder compact and at 1080°C for the in-situ powder for 10 minutes under 50 MPa of sintering pressure and 0.1 Pa vacuum for both processes. The heating rate was 50°/min to reach the sintering temperature. Results from analysis of shrinkage and microstructural observation showed that the in-situ composite powder compacts had a homogeneous and fine microstructure compared to the ex-situ preparation, even though the sintered densities were almost the same (99.6 and 99.8% relative density, respectively).
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 3; 1023-1028
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wysokotemperaturowa korozja materiałów w parze wodnej w sektorze energetycznym
    High temperature performance of materials for the energy sector exposed to water steam
    Autorzy:
    Dudziak, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/391674.pdf
    Data publikacji:
    2014
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
    Tematy:
    korozja wysokotemperaturowa
    blok energetyczny
    stopy żelaza z chromem
    stop niklu
    high temperature corrosion
    power unit
    Fe-based alloys with Cr content
    Ni based alloy
    Opis:
    W artykule opisano zagadnienia związane z polskim sektorem energetycznym, w którym decydującą rolę odgrywa technologia subkrytyczna, w której spalanie węgla odbywa się w zakresie temperatur 500−530°C i przy ciśnieniu 14−16 MPa. Ponadto przedstawiono mechanizm korozji materiałów na bazie żelaza i niklu, zawierających różne ilości chromu, przeznaczonych na budowę nowych bloków energetycznych. Z przeprowadzonych badań w wysokich temperaturach (675°C oraz 725°C) w atmosferze czystej pary wodnej, wynika, iż stopy żelaza z dużą zawartością (18% wag.) chromu tworzą spinel Fe-Cr, który ma gorsze właściwości ochronne niż tlenek Cr2O3, lecz jest bardziej ochronny niż magnetyt (Fe3O4) czy też hematyt (Fe2O3). Stwierdzono również, że stopy żelaza charakteryzowały się powstawaniem wysepek bogatych w magnetyt Fe3O4. Powstawanie takich miejsc jest związane z różnym stężeniem żelaza w osnowie stopu i jego aktywnością, a także niską koncentracją chromu i brakiem możliwości stworzenia ochronnej cienkiej warstwy spinelu czy też samodzielnej warstwy Cr2O3. Stop na bazie niklu IN718+ wytworzył warstewkę spinelu Ni-Cr (NiCr2O4), jego zgorzelina nie przekraczała 2 μm grubości.
    In this work, issues regarding the energy sector in Poland are described in terms of subcritical technology which is commonly used and plays the most important role in electric power production. In such technology steam temperature reaches 500−530°C with 14−16 MPa pressure. In addition, in this study the mechanism of high temperature corrosion of Fe and Ni- based materials with a different content of Cr considered for construction of new coal power plants will be discussed. The study clearly shows that at high temperatures (675°C and 725°C) in a pure steam atmosphere the Fe based alloy with 18 wt.% of Cr creates the formation of Fe-Cr spinel, the phase indicates poorer corrosion resistance than Cr2O3, however better than magnetite (Fe3O4) or hematite (Fe2O3). It was also shown that Fe based alloys were characterised by the development of islands rich in Fe3O4. The formation of such islands is related to an unequal distribution of iron concentration and its activity within the matrix, and the inability to create a thin protective layer of spinel or an independent layer of Cr2O3. The Ni based alloy 718+ developed a layer of Ni-Cr spinel (NiCr2O4) with a thickness of 2 μm.
    Źródło:
    Prace Instytutu Odlewnictwa; 2014, T. 54, nr 3, 3; 43-57
    1899-2439
    Pojawia się w:
    Prace Instytutu Odlewnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Forming of the microstructure in Fe-C-V alloys
    Kształtowanie mikrostruktury stopów Fe-C-V
    Autorzy:
    Kawalec, M.
    Fraś, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/264061.pdf
    Data publikacji:
    2011
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    stopy Fe-C-V
    eutektyka
    żeliwo wysokowanadowe
    mikrostruktura
    Fe-C-V alloys
    eutectic
    high-vanadium cast iron
    microstructure
    Opis:
    The study presents the results of microstructural examinations of the volume solidifying Fe-C-V alloys containing carbon in the range of 1.45-2.23% and vanadium in the range of 7.33-15.08%. Attention was focussed on near-eutectic alloys. The Fe-C-V eutectic crystallising in these alloys is composed of ferrite and vanadium carbides of VC1-x type, and as such is included in the group of fibrous eutectics. During research, the experimental eutectic lines were plotted for Fe-C-V alloys, and a formula enabling calculation of the eutectic saturation ratio of these alloys was proposed.
    W pracy przedstawiono wyniki badań mikrostruktury stopów Fe-C-V, o zawartości węgla w zakresie 1,45-2,23% i wanadu w zakresie 7,33-15,08%, krystalizujących w sposób objętościowy, przy czym szczególną uwagę zwrócono na stopy okołoeutektyczne. Krystalizująca w stopach Fe-C-V eutektyka składa się z ferrytu i węglików wanadu typu VC1-x i jest zaliczana do grupy eutektyk włóknistych. W pracy określono eksperymentalnie przebieg linii eutektycznej dla stopów Fe-C-V oraz wyznaczono zależność na stopień nasycenia eutektycznego dla tych stopów.
    Źródło:
    Metallurgy and Foundry Engineering; 2011, 37, 1; 17-24
    1230-2325
    2300-8377
    Pojawia się w:
    Metallurgy and Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Crystallization of Eutectics in Fe-C-V-Si Alloys
    Autorzy:
    Kawalec, M
    Powiązania:
    https://bibliotekanauki.pl/articles/381286.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    theory of crystallization
    Fe-C-V-Si alloys
    high-vanadium cast iron
    microstructure
    eutectic grain
    teoria krystalizacji
    stopy Fe-C-V-Si
    żeliwo wysokowanadowe
    mikrostruktura
    eutektyka
    Opis:
    This article addresses the results of microstructural examinations of the volume solidifying Fe–C–V–Si alloys containing carbon in the range of 1.39÷1.76%, vanadium in the range of 6.77÷7.77% and silicon in the range of 0.02÷3.10. The melting charge was Armco iron, ferro-vanadium with 81.7 wt.%V, spectrally pure graphite and technically pure silica. It was shown that with increasing the silicon content, the microstructure of the resulting alloy changing. These changes include both a matrix the shape of the primary carbides and type of crystallizing eutectic. In the studied alloys was observed following eutectic: fibrous (crystallize as non-faceted/ non-faceted eutectic), complex regular (crystallize as faceted/ non-faceted eutectic), spiral (crystallize as faceted/ faceted eutectic). The results illustrated by the images of the microstructures made with an optical microscope and a scanning electron microscope.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 1 spec.; 143-146
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stop na bazie Fe-Al - aspekt technologiczny
    Technological aspects of alloys based on the Fe-Al system
    Autorzy:
    Jaśkowiec, K.
    Uhl, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/391686.pdf
    Data publikacji:
    2012
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
    Tematy:
    FAP
    staliwo wysokoaluminiowe
    Fe-Al
    straty aluminium
    twardość
    udarność
    high-aluminium cast steel
    aluminium loss
    hardness
    impact resistance
    Opis:
    W artykule opisano wytop staliwa na bazie Fe-Al. Poruszono zagadnienia technologiczne realizacji wytopu, zaczynając od symulacji komputerowej, kończąc na obróbce odlewu. Efektem pracy było uzyskanie odlewów pracujących w wysokiej temperaturze. Oprócz praktycznych uwag skupiono się na opisie sposobów minimalizacji strat Al oraz na metodach uzyskania odlewów pozbawionych wad typowych dla tego typu staliwa lub żeliwa. Zwrócono szczególną uwagę na twardość i udarność stopów na bazie Fe-Al.
    Melting of cast steel based on Fe-Al system was described. Problems of technological nature related with the melting process performance, starting with computer simulation and in the casting treatment ending, were discussed. The outcome of the study was designing and making of castings for high temperature operation. In addition to practical observations, attention was focussed on the development of methods to reduce to minimum the loss of Al and on the methods to make castings without the defects typical for this type of cast iron or cast steel. Another object of discussion was hardness and impact resistance of alloys based on Fe-Al.
    Źródło:
    Prace Instytutu Odlewnictwa; 2012, 52, 4; 113-126
    1899-2439
    Pojawia się w:
    Prace Instytutu Odlewnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High temperature transformation of iron-bearing minerals in basalt: Mössbauer spectroscopy studies
    Autorzy:
    Kądziołka-Gaweł, Mariola
    Wojtyniak, Marcin
    Klimontko, Joanna
    Powiązania:
    https://bibliotekanauki.pl/articles/2086563.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Mineralogiczne
    Tematy:
    basalts
    high temperature affects
    Mössbauer spectroscopy
    Fe-bearing minerals
    Opis:
    The high temperature decomposition of basalt from Lower Silesia (Poland) was followed by Mössbauer spectroscopy investigation. The Fe content of the sample was ~9.0 at.%. The X-ray diffraction analysis shows that augite (37%) and olivine (12%) are major Fe-bearing mineral components. The sample also contains significant amount of anorthite (22%) and nepheline (17%). The sample was heated at various temperatures between 200o C and 1100o C for three hours. Up to a temperature of 500o C changes in contribution of Fe-bearing minerals are insignificant. Heating in the temperature range from 500o C to 1100o C leads to a systematic increase in contribution of iron oxides at the cost of contribution of silicate minerals, like augite and olivine. Mössbauer spectrum obtained after heating at 1100o C showed hematite as the main iron oxide phase. The ratio of Fe3+/Fetot in the non-heated sample was equal to 0.51 and after heating at 1100o C this ratio amounted to 0.89.
    Źródło:
    Mineralogia; 2022, 53, 1; 10--19
    1899-8291
    1899-8526
    Pojawia się w:
    Mineralogia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Special Structures of Graphite Steels After High-Energy Electron Irradiation
    Autorzy:
    Alexandrova, N. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2011024.pdf
    Data publikacji:
    1999-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.80.Fe
    61.82.Bg
    Opis:
    The effect of high-energy electron irradiation on the structure and properties of the graphite steels have been investigated. It has been shown that single- and multicycle irradiation allows the improvement of hardness and ductility (≈ twice). A partial dissolution of the graphite, carbides redistribution, and refinement of the grain size allow the formation of the favorable surface structure after irradiation.
    Źródło:
    Acta Physica Polonica A; 1999, 96, 2; 259-262
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Diffusive and Displacive Phase Transformations in Nanocomposites under High Pressure Torsion
    Autorzy:
    Straumal, B.
    Kilmametov, A.
    Gornakova, A.
    Mazilkin, A.
    Baretzky, B.
    Korneva, A.
    Zięba, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/356575.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high-pressure torsion
    Ti-Fe alloys
    phase transitions
    high-pressure phases
    Opis:
    The high-pressure torsion (HPT) of Ti-Fe alloys with different iron content has been studied at 7 GPa, 5 anvil rotations and rotation speed of 1 rpm. The alloys have been annealed before HPT in such a way that they contained different amounts of α/α' and β phases. In turn, the β phase contained different concentration of iron. The 5 anvil rotations correspond to the HPT steady-state and to the dynamic equilibrium between formation and annihilation of microstructure defects. HPT leads to the transformation of initial α/α' and β-phases into mixture of α and high-pressure ω-phase. The α → ω and β → ω phase transformations are martensitic, and certain orientation relationships exist between α and ω as well as β and ω phases. However, the composition of ω-phase is the same in all samples after HPT and does not depend on the composition of β-phase (which is different in different initial samples). Therefore, the martensitic (diffusionless) transformations are combined with a certain HPT-driven mass-transfer. We observed also that the structure and properties of phases (namely, α-Ti and ω-Ti) in the Ti – 2.2 wt. % Fe and Ti – 4 wt. % Fe alloys after HPT are equifinal and do not depend on the structure and properties of initial α'-Ti and β-Ti before HPT.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 2; 457-465
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Manufacturing And High Temperature Oxidation Properties Of Electro-Sprayed Fe-24.5% Cr-5%Al Powder Porous Metal
    Wytwarzanie i wysokotemperaturowe utlenianie elektro-rozpylanego porowatego proszku Fe-24.5% Cr-5%Al
    Autorzy:
    Lee, K-A.
    Oh, J-S.
    Kong, Y-M.
    Kim, B-K.
    Powiązania:
    https://bibliotekanauki.pl/articles/350912.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    powder porous metal
    electro-spray process
    electric wire explosion
    Fe-24Cr-5Al
    high temperature oxidation
    porowaty proszek metalu
    elektrorozpylanie
    utlenianie wysokotemperaturowe
    Opis:
    Fe-Cr-Al based Powder porous metals were manufactured using a new electro-spray process, and the microstructures and high-temperature oxidation properties were examined. The porous materials were obtained at different sintering temperatures (1350°C, 1400°C, 1450°C, and 1500°C and with different pore sizes (500 μm, 450 μm, and 200 μm). High-temperature oxidation experiments (TGA, Thermal Gravimetry Analysis) were conducted for 24 hours at 1000°C in a 79% N2+ 21% O2, 100 mL/min. atmosphere. The Fe-Cr-Al powder porous metals manufactured through the electro-spray process showed more-excellent oxidation resistance as sintering temperature and pore size increased. In addition, the fact that the densities and surface areas of the abovementioned powder porous metals had the largest effects on the metal’s oxidation properties could be identified.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 2B; 1169-1173
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Frequency Discrimination for Amplitude Modulated Sinusoidal Signals at High Carrier Frequencies
    Autorzy:
    Sęk, A.
    Kordus, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1359956.pdf
    Data publikacji:
    2014-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.66.Fe
    43.66.Hg
    Opis:
    The current study is a continuation of experiments presented by Sęk and Bukała (Acta Physica Polonica A 123, 1106 (2013)). The purpose of the present study was to investigate frequency discrimination of amplitude modulated high frequency carriers. Using 2AFC procedure, the subjects were presented with two observation intervals of which the first interval contained four pulses of the same high frequency signal (called SSSS), while in the second interval (called SHSH) the second and fourth pulses had higher frequencies values (i.e. shifted upwards by Δ f). The carrier frequency (in S pulses) was fixed and equal to 10 kHz. Modulation rates were equal to 100, 200, 337, 500, 600, 733, and 800 Hz. The value of the modulation rate was limited to keep all components of the sinusoidal modulation within one auditory filter (17% of the center frequency) centered at the carrier frequency. Two different types of modulation were used: a simple sinusoidal modulation with the modulation depth m set to 100%, and a logarithmic modulation with the modulation depth m set to 50 dB. Results indicate a strong relationship between frequency discrimination threshold and modulation type. The thresholds are significantly higher for logarithmic modulation in comparison to sinusoidal modulation. Amplitude modulation as well as logarithmic modulation applied to the high frequency carrier cause significant increase in the frequency discrimination threshold. For high frequency sinusoidal signal carriers (i.e. close to 10 kHz), frequency discrimination thresholds do not depend on amplitude modulation rates up to about 800 Hz. In general, the excitation pattern mechanism was a primary cue enabling frequency discrimination of modulated and unmodulated signals to compare with the mechanism based on the temporal fine structure. However, the excitation pattern was not the only mechanism responsible for the frequency discrimination.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 4A; A-149-A-154
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ortho-Positronium in Alkanes under High Pressure
    Autorzy:
    Goworek, T.
    Zgardzińska, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812529.pdf
    Data publikacji:
    2008-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    36.10.Dr
    61.80.Fe
    71.60.+z
    78.70.Bj
    Opis:
    Phase transitions in n-alkanes were observed by using the positron annihilation lifetime method. In the case of alkanes, application of pressure is equivalent to temperature lowering (1 K corresponds to ≈4 MPa). When argon at high pressure penetrates the sample one observes a non-monotonous dependence of the melting point on pressure. This effect is observed also in even-numbered alkanes, in which there is no rotator phase.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 5; 1379-1383
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High-Temperature X-ray Diffraction Studies of Lattice Dynamics in Ni$\text{}_{3}$(Fe,Nb) Ordered Alloys
    Autorzy:
    Mekhrabov, A. O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1930628.pdf
    Data publikacji:
    1994-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.10.-i
    Opis:
    A study is performed on characteristics of lattice dynamics in the initially ordered ternary Ni$\text{}_{3}$(Fe$\text{}_{1-x}$Nb$\text{}_{x}$) (x = O to 10 at.%) alloys using high temperature X-ray diffractometry for the temperature range from 300 K to 1300 K. Aspects investigated included temperature and concentration dependencies of the full mean square atomic displacements Ū²$\text{}_{f}$, the Debye characteristic temperature Θ$\text{}_{D}$, and linear thermal expansion coefficient α. It is found that the Ū²$\text{}_{f}$, Θ$\text{}_{D}$, and α parameters show anomalous change at temperatures where the alloys are subjected to order-disorder phase transitions. It is further found that Nb addition results in the considerable increase in the parameters Ū²$\text{}_{f}$ and α and decrease in Θ$\text{}_{D}$. Moreover, the addition of Nb stabilizes Ni$\text{}_{3}$Fe ordered structure and shifts the order-disorder transition to higher temperature.
    Źródło:
    Acta Physica Polonica A; 1994, 85, 3; 571-578
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Consolidation of Nanocrystalline Nd-Fe-B Powder by Hydrostatic Extrusion at High Temperature
    Autorzy:
    Gizynski, T.
    Kaszuwara, W.
    Kulczyk, M.
    Leonowicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030247.pdf
    Data publikacji:
    2017-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Ww
    Opis:
    Hydrostatic extrusion is a modern method of shaping material microstructure and properties. Hydrostatic extrusion can also be successfully used for consolidation of hard magnetic powders. The effect of extrusion temperature, within the range of 700-800°C, on the magnetic properties of the bulk, final product was studied. A commercial MQU-F42 powder, dedicated to hot pressing, was placed in copper capsules and initially cold compacted up to 60% of the theoretical density. Subsequently, the billet was heated in an oven to temperatures 700 and 800°C, respectively and subjected to hydrostatic extrusion. The extruded product had a form of a copper rod, with the Nd-Fe-B core, having 96% of theoretical density (true strain 1.85 after extrusion at 800°C). The extrusion process led to deterioration of the coercivity, for which coarsening of the Nd₂Fe₁₄B grains was blamed. In order to prove this hypothesis, the starting powder was annealed in a temperature range of 550-900°C for various times. The crystallite size, measured after annealing by the X-ray diffraction method, showed that with extension of time and elevation of the temperature the crystallite size increases, however the dominating parameter is the temperature. Correlation of the crystallite size with temperature indicates that when the crystallites are larger than 80 nm the magnetic properties dramatically decrease. Additionally, after HE at 800°C micrometric size Nd-rich phase appear in the microstructure. The Nd is squeezed from the grain boundary of the Nd₂Fe₁₄B phase leading to non-isolated grains, which also contributes to the deterioration of the coercivity.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 5; 1260-1263
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of High Co Addition on the Properties of $Fe_{79}Zr_{9}B_{12}$ and $Fe_{76}Zr_{9}B_{15}$ Alloys
    Autorzy:
    Yu, W.
    Long, D.
    Liu, Y.
    Sun, Y.
    Hua, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401884.pdf
    Data publikacji:
    2015-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    65.60.+a
    61.43.Dq
    Opis:
    Thermal properties, microstructure and magnetic properties of $Fe_{79}Zr_{9}B_{12},$ $Fe_{76}Zr_{9}B_{15},$ $Fe_{39.5}Co_{39.5}Zr_{9}B_{12}$ and $Fe_{38}Co_{38}Zr_{9}B_{15}$ alloys were investigated by differential thermal analysis, X-ray diffraction and vibrating sample magnetometer. High Co addition has a significant impact on the properties of alloys. High Co addition increases the main crystallization peak temperature and the crystallization activation energy. Moreover, high Co addition changes the crystallization products and influences the crystallization processes of $Fe_{79}Zr_{9}B_{12}$ and $Fe_{76}Zr_{9}B_{15}$ alloys. The specific saturation magnetization $(M_{s})$ increases and coercivity $(H_{c})$ decreases by high Co additions.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 3; 340-342
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Fe-Ti Inoculation on Solidification, Structure and Mechanical Properties of High Chromium Cast Iron
    Autorzy:
    Kopyciński, D.
    Siekaniec, D.
    Szczęsny, A.
    Guzik, E.
    Nowak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/353234.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high chromium cast iron
    inoculation
    titanium
    mechanical properties
    Opis:
    The results of studies of the effect of different amounts of the Fe-Ti inoculant on structure and selected mechanical properties of High Chromium Cast Iron (conventionally abbreviated as HCCI) are presented. The main purpose of the inoculation is structure refinement and hence the improvement of casting properties. Generally considered a strong carbide-forming element, titanium is an effective inoculant for the high chromium cast iron. However, there is an optimal amount of titanium addition beyond which the mechanical properties begin to deteriorate. The studies enabled determining the amount of Fe-Ti inoculant optimal for the cast iron of a given chemical composition.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 4; 2183-2187
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    $\text{}^{57}Fe$ Hyperfine Interactions in the $Sc(Fe_{1-x}Ni_x)_2$ Laves Phases Synthesized under High Pressure
    Autorzy:
    Wiertel, M.
    Surowiec, Z.
    Budzyński, M.
    Tsvyashchenko, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811581.pdf
    Data publikacji:
    2008-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.80.+y
    77.80.Bh
    75.30.Kz
    07.35.+k
    Opis:
    The structural and microscopic magnetic properties of the pseudobinary $Sc(Fe_{1-x}Ni_x)_2$ system prepared under high pressure of 8 GPa were studied by X-ray diffraction and Mössbauer measurements in the range of 0.0 ≤ x ≤ 0.60. The samples for 0.0 ≤ x ≤ 0.10 have the hexagonal C14-type structure and those for 0.30 ≤ x ≤ 0.60 crystallize in the C15-type structure. Both the magnetic hyperfine field on $\text{}^{57}Fe$ and the Curie temperature decrease with the increasing Ni content and the system becomes paramagnetic for x ≈ 0.60 at room temperature. The form and temperature dependences of the Mössbauer spectra for 0.40 ≤ x ≤ 0.50 indicate the coexistence of paramagnetic and ferromagnetic regions in the samples and occurrence of magnetic clusters with a wide distribution of the Curie temperatures. It is interesting that $T_C$ for the compounds obtained under high pressure are by about 100 K smaller in comparison with those for the isostructural samples produced under normal pressure even though interatomic distances are practically equal in the both types of compounds.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 6; 1517-1527
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fabrication of Fe-TiB2 Nanocomposites by Spark-Plasma Sintering of a (FeB, TiH2) Powder Mixture
    Autorzy:
    Huynh, X.-K.
    Kim, B.-W.
    Kim, J.-S.
    Powiązania:
    https://bibliotekanauki.pl/articles/351368.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Fe-TiB2 nanocomposite
    mechanical activation
    spark plasma sintering
    self-propagating high-temperature synthesis reaction
    Opis:
    Fe-40wt% TiB2 nanocomposites were fabricated by mechanical activation and spark-plasma sintering of a powder mixture of iron boride (FeB) and titanium hydride (TiH2). The powder mixture of (FeB, TiH2) was prepared by high-energy ball milling in a planetary ball mill at 700 rpm for 3 h followed by spark-plasma sintering (SPS) at various conditions. Analysis of the change in relative sintered density and densification rate during sintering showed that a self-propagating high-temperature synthesis reaction occurs to form TiB2 from FeB and Ti. A sintered body with relative density higher than 98% was obtained after sintering at 1150°C for 5 and 15 min. The microstructural observation of sintered compacts with the use of FE-SEM and TEM revealed that ultrafine particulates with approximately 5 nm were evenly distributed in an Fe-matrix. A hardness value of 83 HRC was obtained, which is equivalent to that of conventional WC-20 Co systems.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 2; 1043-1047
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Necessary Thermodynamics Factors to Obtain Simple Solid Solutions in High-Entropy Alloys from the Al-Ti-Co-Ni-Fe System
    Autorzy:
    Górecki, K.
    Bała, P.
    Kozieł, T.
    Cios, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/356241.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    High-Entropy Alloys
    entropy
    enthalpy
    VEC
    solid solution
    Opis:
    In this paper findings regarding the design and synthesis of High-Entropy Alloys based on mixing enthalpy, mixing entropy, δ parameter, Ω parameter and valence electron concentration are presented. Four alloys were synthesised with different predicted crystalline structures. Results of the microstructure and crystal structure studies are presented. It was shown that predicted structures as well as complex intermetallic phases exist in the material. The validity of valence electron concentration as well as additional parameters such as mixing enthalpy, mixing entropy and others necessary to obtain only the solid solution in High-Entropy Alloys were examined.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 4; 2141-2145
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructures and Tensile Properties of Fe-Cr-Al Oxide Dispersion Strengthened Ferritic Alloys for High Temperature Service Components
    Autorzy:
    Park, Minha
    Bae, Jaeyoon
    Kim, Byung-Jun
    Kim, Bu-Ahn
    Noh, Sanghoon
    Powiązania:
    https://bibliotekanauki.pl/articles/2203715.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Fe-Cr-Al
    ferritic alloy
    oxide dispersion strengthening
    complex oxide
    tensile strength
    Opis:
    In present study, Fe-22Cr-4.5Al oxide dispersion strengthened ferritic alloys were fabricated using a pre-alloyed powder with different minor alloying elements, and their microstructures and tensile properties were investigated to develop the advanced structural materials for high temperature service components. Planetary-typed mechanical alloying and uniaxial hot pressing processes were employed to fabricate the Fe-Cr-Al oxide dispersion strengthened ferritic alloys. Microstructural observation revealed that oxide dispersion strengthened ferritic alloys with Ti, Zr additions presented extremely fine micro-grains with a high number density of nano-scaled oxide particles which uniformly distributed in micro-grains and on the grain boundaries. These oxide particles were confirmed as a fine complex oxide, Y2Zr2O7. These favorable microstructures led to superior tensile properties than commercial ferritic stainless steel and oxide dispersion strengthened ferritic alloy with only Ti addition at elevated temperature.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 1; 85--88
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vertical vibrations of composite bridge/track structure/high-speed train systems. Part 2: Physical and mathematical modelling
    Autorzy:
    Podworna, M.
    Klasztorny, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/200194.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    composite steel-concrete bridge
    ballasted track structure
    high-speed train
    random track irregularities
    FE modelling
    equations of motion
    Opis:
    A theory of one-dimensional physical and mathematical modelling of the composite (steel-concrete) bridge/track structure/highspeed train system is developed including viscoelastic suspensions of rail-vehicles with two two-axle bogies each, non-linear Hertz contact stiffness and one-sided contact between wheel sets and rails, the viscoelastic and inertia features of the bridge, the viscoelastic track structure on and beyond the bridge, approach slabs, and random vertical track irregularities. Compared to the state-of-the-art, the physical model developed in the study accurately reproduces dynamic processes in the considered system. Division of the system into the natural subsystems, a method of formulation of the equations of motion partly in implicit form and the finite element method are applied. Vibrations in the vertical plane of symmetry are described by more than nine matrix equations of motion with constant coefficients. Couplings and non-linearity are hidden in the generalized load vectors. The equations of motion are integrated using the implicit Newmark average acceleration method with linear extrapolation of the interactions between the subsystems.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 1; 181-196
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure and Chemical Composition of Fe-Cr Alloy Tempered in High Temperature and Atmosphere Containing Ar-SO2
    Autorzy:
    Radziszewska, A.
    Kranzmann, A.
    Dörfel, I.
    Mosquera Feijoo, M.
    Solecka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/354072.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    microstructure
    high-temperature corrosion
    X20Cr13 steel
    Opis:
    The paper presents the microstructure, chemical and phase composition of thin scale, obtained as a result of high-temperature corrosion of X20Cr13 stainless steel. Samples were exposed to gas atmosphere of the following composition: 0.25 vol.% of SO2 and 99.75 vol.% of Ar at 600 °C for 5 h. As a consequence, thin compact scale was formed on steel surface. This scale consisted of three different zones. An amorphous zone was formed close to steel surface. Then, nanocrystalline zone could be observed. Finally, larger grains were formed during the corrosion process. The analysis of the chemical composition revealed higher concentration of chromium near steel surface. In contrast, to chromium, the content of iron, increased near the scale surface. It was found out that the (Cr, Mn, Fe)5O12 phase appeared in the thin scale.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 3; 1607-1612
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High-Voltage Pulses Potentiate Bleomycin Cytotoxicity Towards Cancer Cells in vitro
    Autorzy:
    Saulė, R.
    Saulis, G.
    Batiuškaitė, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807930.pdf
    Data publikacji:
    2009-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.50.cj
    87.80.Fe
    87.50.cf
    Opis:
    In this study the influence of high-voltage pulses on bleomycin cytotoxicity towards mouse hepatoma MH-22A and rat glioma C6 cells in vitro was determined. It was obtained that combining bleomycin with pulses of strong electric field significantly enhances the number of cells killed by bleomycin. Bleomycin alone was cytotoxic to both cell lines at concentrations above 1 μM. Treatment of cells by electric pulses in the presence of bleomycin greatly potentiated its cytotoxicity towards both cell lines tested - the bleomycin concentration required to reduce cell survival by 50% was 3.5-3.8 nM only. Exposure of cells to electric pulses only did not reduce cell viability.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 6; 1098-1100
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetocaloric Effect in Nanostructured $Pr_2Fe_{17}$ and $Nd_2Fe_{17}$ Synthesized by High-Energy Ball-Milling
    Autorzy:
    Alvarez, P.
    Sánchez-Marcos, J.
    Sanchez Llamazares, J.
    Franco, V.
    Reiffers, M.
    Blanco, J.
    Gorria, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1534200.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.cp
    75.50.Tt
    75.30.Kz
    Opis:
    Nanocrystalline $Pr_2Fe_{17}$ and $Nd_2Fe_{17}$ powders with rhombohedral $Th_2Zn_{17}$-type crystal structure and average particle sizes around 20 nm have been obtained by high-energy ball milling. While the bulk alloys show a well-defined and sharp drop in the low-field magnetization curve at the Curie temperature, $T_{C}$ = 285 K (Pr) and 335 K (Nd), the ball-milled samples exhibit a substantial broadening of the ferro-to-paramagnetic transition due to a considerable augmentation of the disordered inter-grain boundaries. The latter results in an increase of more than 25% in the values of the full width at half maximum of the temperature dependence of the magnetic entropy change maintaining almost unchanged the relative cooling power.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 867-869
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High-Pressure EPR Study of Spin Molecular Bistability in $Li[Fe(Th-5Cl-Sa)_2]$
    Autorzy:
    Krupska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1205442.pdf
    Data publikacji:
    2014-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Wx
    33.35.+r
    75.50.Bb
    Opis:
    The spin transitions in $Li[Fe(Th-5Cl-Sa)_2]$ were studied by EPR under hydrostatic pressure in the temperature range 80-332 K. The structural changes in the complex anion induced by the pressure above 350 MPa (when LS-2 phase appears) are observed, which are manifested in abrupt changes in $g_{⊥}$ factor and linewidth $ΔB_{⊥}$ of the low-spin phase LS. It is also manifested in the change in the shape of EPR spectrum. The high-spin $↔$ low-spin transition $HS ↔ LS$ shows hysteresis whose width is constant up to about 265 K and then rapidly increases. The spin phase diagram studied shows a large similarity to the phase diagram of $(2Me-5Et-PyH)[Fe(Th-5Cl-Sa)_2]$, which means that characteristics of the transition depend mainly on complex anion, not on cation. The hysteresis indicates on a cooperative character of the spin transition and on grouping of the complexes in domains.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 3; 790-794
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Novel FE/MC-based Mathematical Model of Mushy Steel Deformation with GPU Support
    Autorzy:
    Hojny, Marcin
    Dębiński, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/2106557.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    FEM
    Monte Carlo
    extra-high temperatures
    soft-reduction
    GPU
    Opis:
    The paper presents the results of work leading to the construction of a spatial hybrid model based on finite element (FE) and Monte Carlo (MC) methods allowing the computer simulation of physical phenomena accompanying the steel sample testing at temperatures that are characteristic for soft-reduction process. The proposed solution includes local density variations at the level of mechanical solution (the incompressibility condition was replaced with the condition of mass conservation), and at the same time simulates the grain growth in a comprehensive resistance heating process combined with a local remelting followed by free/controlled cooling of the sample tested. Simulation of grain growth in the entire computing domain would not be possible without the support of GPU processors. There was a 59-fold increase in the computing speed on the GPU compared to single-threaded computing on the CPU. The study was complemented by examples of experimental and computer simulation results, showing the correctness of the adopted model assumptions.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 2; 735--742
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vertical vibrations of composite bridge/track structure/high-speed train systems. Part 1: Series-of-types of steel-concrete bridges
    Autorzy:
    Podworna, M.
    Klasztorny, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/202151.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    composite steel-concrete bridge
    ballasted track structure
    high-speed train
    design
    FE modelling
    simulation
    forced resonances
    numerical analysis
    Opis:
    A new series-of-types of single-span simply-supported railway composite (steel-concrete) bridges, with a symmetric platform, has been designed according to the Polish bridge standards. The designed bridges/viaducts are located on the main railways of the classification coefficient k = +2. A ballasted track structure adapted to high operating speeds has also been designed. The ultimate limit states and the limit states corresponding to the bridges undertaken are collected and discussed. The bridges have been designed in accordance with contemporary art engineering, with geometric and material optimization, avoiding overdesign. A new methodology of numerical modelling and simulation of dynamic processes in composite bridge/ballasted track structure/high speed train systems, developed in Part 2 and Part 3, has been applied and implemented in a problem-oriented computer programme. A new approach to predicting forced resonances in those systems is formulated and tested numerically. It has been proved that in the case of typical structural solutions of bridges and ballasted track structures, it is necessary to introduce certain limitations for operating speeds of trains.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 1; 165-179
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preliminary results of 57Fe Mössbauer spectroscopy of metamict samarskite after one-hour high temperature annealing in argon
    Autorzy:
    Malczewski, D.
    Grabias, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/146552.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    samarskite
    metamict minerals
    Mössbauer spectroscopy
    recrystallization
    Opis:
    The preliminary results of 57Fe Mössbauer spectroscopy and X-ray diffraction (XRD) of fully metamict samarskite dated at ~1500 Ma, which absorbed -dose of 6.5 × 1017 α-decay mg–1, are reported after one-hour annealing at 673, 873, 1173 and 1373 K in argon atmosphere. Metamict minerals contain radioactive elements that degrade their crystal structures over geological time. All the Mössbauer spectra obtained can be fitted to two quadrupole doublets assigned to Fe2+ and Fe3+ in octahedral positions. The relative contribution of Fe2+ (Fe2+/Fe) reaches a minimum of 0.10 at 1173 K.
    Źródło:
    Nukleonika; 2017, 62, 2; 141-144
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    XRD phase investigations of steam oxidized Fe and Ni rich Cr alloys
    Autorzy:
    Dudziak, T.
    Witkowska, M.
    Ratuszek, W.
    Chruściel, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/391538.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
    Tematy:
    austenitic steel
    Ni based alloys
    high temperature
    steam
    XRD
    Opis:
    The aim of this work was to summarise XRD investigations performed after the tests carried out in steam oxidation conditions in the temperature range 700‒800°C for 3000 hours. In this work, two solid-solution strengthened alloys; Haynes® 230®, 617 alloy and two (γ’) gamma-prime strengthened alloys; 263 and Haynes® 282® and high alloyed steels rich in Cr: 309S, 310S and HR3C were exposed. The phase analyses were carried out using two techniques; Bragg-Brentano (BB) geometry and geometry of constant angle called grazing incidence α = 1° and α = 3°.
    Źródło:
    Prace Instytutu Odlewnictwa; 2017, 57, 4; 265-276
    1899-2439
    Pojawia się w:
    Prace Instytutu Odlewnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The mechanism of $CaCO_3$ in the gas-based direct reduction of a high-phosphorus oolitic iron ore
    Autorzy:
    Wu, Shichao
    Li, Zhengyao
    Sun, Tichang
    Kou, Jue
    Xu, Chengyan
    Powiązania:
    https://bibliotekanauki.pl/articles/1446124.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    high-phosphorus oolitic iron ore
    gas-based direct reduction
    magnetic separation
    $Fe_3PO_7$
    $CaCO_3$
    Opis:
    Gas-based direct reduction and magnetic separation process was applied in treating a high-phosphorus oolitic iron ore, of which phosphorus mainly occured as $Fe_3PO_7$ and apatite. The mechanism of $CaCO_3$ was investigated using XRD, SEM-EDS, and mineral phase analysis. Results showed that when no CaCO3 was added, most of the iron minerals were reduced to metallic iron, while $Fe_3PO_7$ was reduced to elemental phosphorus and mixed with the metallic iron particles. When a small amount of $CaCO_3$ was added, $CaCO_3$ preferentially reacted with $SiO_2$, $Al_2O_3$ and other components, preventing them from reacting with FeO and resulting in the increase of iron recovery. When the amount of $CaCO_3$ reached 25%, apatite was produced from the reaction of CaO and $Fe_3PO_7$, which could be later removed by grinding and magnetic separation.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2021, 57, 4; 117-124
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The choice of high gradient magnetic separation processes for removal of Fe2O3 carriers from quartz raw material
    Wybór procesów separacji magnetycznej wysokogradientowej do usuwania nośników Fe2O3 z surowca kwarcowego
    Autorzy:
    Sekulic, Z.
    Bartulovic, Z.
    Mihajlovic, S.
    Ignjatovic, M.
    Savic, L.
    Jovanovic, V.
    Nisic, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/216606.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
    Tematy:
    quartz raw material
    mineral impurities
    preparation process
    high gradient separation
    magnetic separation
    surowiec kwarcowy
    zanieczyszczenia surowca
    proces wzbogacania
    separacja wysokogradientowa
    separacja magnetyczna
    Opis:
    This review article surveys the subject of choice of high gradient magnetic separation processes for removal of Fe2O3 carriers from quartz raw material by electromagnetic separator with magnetic field intensity of 1.4 T. The review is based on current experience of authors during research phase, as well as project development phase and initial operation of facilities in several locations. Quartz mineral raw material in those locations appeared as sandstone or as loose material. In addition to that, quartz raw material from those locations contained various impurities, i.e. Fe2O3 carriers. The choice of this process for Fe2O3 removal depended on mineralogical composition, shape and the content of minerals, and Fe2O3 removal rate after this process was from 29 to 65%. Magnetic separation is magnetic induction of 1.4 T. It is applied on commercial assortments which were previously subjected to washing and classification processes. It is always the assortment which has to have the lowest Fe2O3 content. The choice of „dry“ or „wet“ magnetic separation (with water flush) also depends on the fact whether this desired assortment is intended for market as dry or wet, as well as on the composition of magnetic impurities. In most cases, the process applied is the wet one.
    W artykule dokonano przeglądu badań nad zastosowaniem procesów separacji magnetycznej wysokogradientowej w celu usunięcia nośników Fe2O3 z surowca kwarcowego z a pomocą separatora elektromagnetycznego o natężeniu pola magnetycznego wynoszącego 1,4 T. Przegląd opiera się na aktualnym doświadczeniu autorów podczas fazy badań, a także fazy planowania projektu i początkowej eksploatacji obiektów w kilku miejscach. Kwarcowy surowiec mineralny w tych miejscach występował jako piaskowiec lub luzem. Poza tym surowiec kwarcowy z tych miejsc zawierał różne zanieczyszczenia, np. nośniki Fe2O3. Wybór tego procesu w celu usunięcia Fe2O3 zależał od składu mineralogicznego, kształtu i zawartości minerałów, a stopień usuwania Fe2O3 w tym procesie wynosił od 29 do 65%. Separacja magnetyczna jest indukcją magnetyczną o natężeniu pola 1,4 T. Stosuje się ją do handlowych asortymentów, które były wcześniej poddawane procesom przemywania i klasyfikacji. Zawsze jest to asortyment, który musi mieć najniższą zawartość Fe2O3. Wybór „suchej” lub „mokrej” separacji magnetycznej (z płukaniem wodą) zależy również od tego, czy pożądany asortyment jest przeznaczony do sprzedaży na sucho czy na mokro, a także od składu zanieczyszczeń magnetycznych. W większości przypadków stosowany jest proces mokry.
    Źródło:
    Gospodarka Surowcami Mineralnymi; 2017, 33, 4; 93-106
    0860-0953
    Pojawia się w:
    Gospodarka Surowcami Mineralnymi
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Erratum to “Preliminary results of 57Fe Mössbauer spectroscopy of metamict samarskite after one-hour high temperature annealing in argon” [Nukleonika 2017;62(2):141-144]
    Autorzy:
    Malczewski, D.
    Grabias, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/147593.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Źródło:
    Nukleonika; 2017, 62, 4; 311
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fe-Al based composite reinforced with ultra-fine Al2O3 oxides for high temperature applications
    Autorzy:
    Kopec, Mateusz
    Jóźwiak, Stanisław
    Kowalewski, Zbigniew
    Powiązania:
    https://bibliotekanauki.pl/articles/2055052.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    cermet composites
    reaction synthesis
    powder method
    electron microscopy
    Opis:
    In this paper, an Fe-Al based composite reinforced with ultra-fine Al2O3 oxides was obtained through sintering of aluminium, iron and mullite ceramic powders using self-propagated high temperature synthesis (SHS). The powder mixture with a 50%wt. content of the ceramic reinforcement was cold pressed and subsequently subjected to the sintering process in vacuum at 1200◦C for 25 minutes under external loading of 25 kN. The complex microstructure of the Fe-Al matrix reinforced with ultra-fine Al2O3 oxides was found to be desired in high temperature applications since only 3% of the relative weight gain was observed after 100 hours of annealing at 900◦C.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2021, 59, 3; 509--513
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Die Wall Lubrication on High Velocity Compaction Behavior and Sintering Properties of Fe-Based PM Alloy
    Autorzy:
    Liu, Zili
    Li, Dong
    Liu, Xiqin
    Li, Haohao
    Huang, Xin
    Tang, Zhihao
    Zou, Yuwen
    Powiązania:
    https://bibliotekanauki.pl/articles/352101.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high velocity compaction
    die wall lubrication
    green density
    impact force
    cold welding
    Opis:
    Fe-based PM alloy powder of Fe-2.5Ni-0.5Mo-2Cu-0.4C was pressed by high velocity compaction combined with die wall lubrication, and the effect of die wall lubrication on high velocity compaction behavior and sintering properties of the Fe-based PM alloy were studied. The results indicate that the impact force, green density, sintered density of samples increase with the augment of the impact velocity and die wall lubrication. Compared with that without die wall lubrication, the green density and sintered density of the sample with die wall lubrication are about 0.07-0.12 g/cm3 and 0.08~0.11 g/cm3 higher at the same impact velocity, respectively, while the ejection force of the die wall lubricated sample is much smaller, and reduced about 26%~36%. The green compact with die wall lubrication has much fewer porosity than that without die wall lubrication, and more mechanical bonding and cold welding regions are observed. The sintered samples mainly consists of gray pearlite and white ferrite, and more pearlite is observed in the sintered sample with die wall lubrication.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 2; 677-684
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of High Temperature Corrosion Resistance in Gaseous Environment of Alloys based on Intermetallic Phase Matrix Fe40Al5CrZrb And Steel X12CrCoNi2120
    Porównanie wysokotemperaturowej odporności korozyjnej w środowisku gazowym stopów na osnowie fazy międzymetalicznej Fe40Al5CrTiB i stali X12CrCoNi2120
    Autorzy:
    Cebulski, J.
    Fornalczyk, A.
    Pasek, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/353132.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    corrosion resistance
    high-temperature corrosion
    alloys intermetallic FeAl matrix phase
    odporność korozyjna
    korozja wysokotemperaturowa
    faza międzymetaliczna FeAl
    Opis:
    The paper presents results of the research which aim was to compare the corrosion resistance of alloys based on intermetallic phase after Fe40Al5CrTiB crystallization and after forming the steel corrosion resistant X12CrCoNi2120 species. The tests were performed for steel at temperature of 700°C Fe40Al5CrTiB and for alloy at 1100°C and 9% O2 0.2% HCl + SO2+ 0.08 N2 environment. In the research the changes of weight after corrosion tests, observations of the surface, specified chemical and phase composition of corrosion products were made. The obtained results of the study showed a very good corrosion resistance of Fe40Al5CrTiB alloys in high temperature and environments containing oxygen, sulfur and chlorine as compared to the corrosion resistance of the steel grade X12CrCoNi2120. Results of the research conducted in this scope are the basis for further research.
    W artykule przedstawiono wyniki badań mających na celu porównanie odporności korozyjnej stopów na osnowie fazy międzymetalicznej Fe40A15CrTiB po krystalizacji i po przeróbce plastycznej ze stalą odporną na korozję gatunku X 12CrCoNi2120. Badania wykonano dla stali w temperaturze 700°C oraz dla stopu Fe40A15CrTiB w temperaturze 1100°C w środowisku: 9% O2+0,2 HC1 + 0,08% SO2+ N2. Określono zmiany masy po badaniach korozyjnych, wykonano obserwacje stanu powierzchni, określono skład chemiczny i fazowy produktów korozji. Uzyskane rezultat)' badań wykazały bardzo dobrą odporność stopów Fe40A15CrTiB na korozję wysokotemperaturową w środowisku zawierającym tlen, siarkę i chlor w porównaniu do odporności korozyjnej stali gatunku X12CrCoNi2120. Wyniki badań prowadzonych w tym zakresie stanowią podstawę do dalszych prac badawczych.
    Źródło:
    Archives of Metallurgy and Materials; 2014, 59, 2; 447-450
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electron Spin Resonance Spectra of Fe$\text{}^{3+}$ Ions in SrLaAlO$\text{}_{4}$ and SrLaGaO$\text{}_{4}$ High-T$\text{}_{c}$ Substrates
    Autorzy:
    Jabłoński, R.
    Pajączkowska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1964358.pdf
    Data publikacji:
    1997-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.30.-v
    61.72.Hh
    Opis:
    New results concerning paramagnetic defects in SrLaAlO$\text{}_{4}$ and SrLaGaO$\text{}_{4}$ high-T$\text{}_{c}$ substrates connected with unavoidable impurity Fe$\text{}^{3+}$ are reported. The identification was checked by measuring the spectra in SrLaAlO$\text{}_{4}$ crystals intentionally doped with 0.5 at.% Fe. Angular dependences of three lines were distinguished at X-band frequency in the temperature range from 4 K to 300 K. We attribute these lines to the transitions inside the doublets ±1/2, and "forbidden" doublets ±3/2, ±5/2, respectively. By diagonalization of spin-Hamiltonian, parameters |D| > 1.2 cm$\text{}^{-1}$, |E| ≈ 0.1 cm$\text{}^{-1}$ and g$\text{}_{x}$=g$\text{}_{y}$=g$\text{}_{z}$= 1.987(13) for SrLaAlO$\text{}_{4}$ and SrLaGaO$\text{}_{4}$ were calculated and within the margin of error they were of the same value.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 1; 173-176
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The domain structure of die-upset anisotropic magnet based on Nd-(Fe, Co)-B alloy
    Struktura domenowa anizotropowego odkształconego na gorąco magnesu na bazie związku Nd-(Fe, Co)-B
    Autorzy:
    Płusa, D.
    Dośpial, M.
    Derewnicka-Krawczyńska, D.
    Wieczorek, P.
    Kotlarczyk, U.
    Powiązania:
    https://bibliotekanauki.pl/articles/354074.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    exchange interactions
    high coercivity materials
    permanent magnets
    domain walls and domain structure
    Opis:
    The measurements of the recoil curves for the die-upset Nd-(Fe, Co)-B based magnets from different points on the magnetization and demagnetization curves have been carried out by means of the LakeShore vibrating sample magnetometer in an applied magnetic fields up to 2 T. From the recoil curves the so-called Wohlfarth's remanence relationship has been derived. From this it was deduced that the magnetic interaction existing between the magnet grains has a dipolar nature. The existence of the magnetic interaction has been confirmed by magnetic domain observations by using the magnetic force microscopy (MFM). In the area of interaction domains there is the fine scale magnetic contrast resulting from the dipolar interaction between neighboring grains.
    Za pomocą magnetometru wibracyjnego firmy LakeShore wyznaczono krzywe powrotne dla spęczanych magnesów Nd-(Fe, Co)-B w polu magnetycznym do 2 T. Na podstawie krzywych powrotnych wyznaczono zależność remeanencyjną Wohlfartha. Z zależności tej wynika, że oddziaływania magnetyczne pomiędzy ziarnami to dalekozasięgowe oddziaływania dipolowe. Obecność tych oddziaływań została potwierdzona przez obserwację struktury domenowej za pomocą mikroskopu sił magnetycznych (MFM). Oscylacyjne zmiany kontrastu, występujące w obszarach zbliżonych do wielkości ziaren, świadczą o istnieniu uporządkowania magnetycznego w tych obszarach, które jest wynikiem oddziaływania dipolowego między sąsiednimi ziarnami.
    Źródło:
    Archives of Metallurgy and Materials; 2011, 56, 1; 159-161
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanisms of plastic deformation in light high-manganese steel of TRIPLEX type
    Autorzy:
    Sozańska-Jędrasik, Liwia
    Borek, Wojciech
    Mazurkiewicz, Janusz
    Powiązania:
    https://bibliotekanauki.pl/articles/2090674.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Fe-Mn-Al-C steels
    mechanism of plastic deformation
    microbands
    shear bands
    slip band
    TEM
    transmission electron microscopy
    stale Fe-Mn-Al-C
    mechanizm odkształcenia plastycznego
    transmisyjna mikroskopia elektronowa
    pasmo ścinania
    mikropasma
    pasmo poślizgu
    Opis:
    In this scientific publication, research results of two newly developed hot-rolled Fe-Mn-Al-C (X105) and Fe-Mn-Al-Nb-Ti-C (X98) types of steel were compared. These types of steel are characterized by an average density of 6.68 g/cm³, a value 15% lower compared to conventional structural steel. Hot rolling was carried out on a semi-industrial line to evaluate the effect of hot plastic deformation conditions with different cooling variants on the structure. The detailed analysis of phase composition as well as microstructure allows us to state that the investigated steel is characterized by an austenitic-ferritic structure with carbides precipitates. The results of the transmission electron microscopy (TEM) tests of both types of steel after hot rolling showed the occurrence of various deformation effects such as shear bands, micro bands, and lens twins in the microstructure. Based on the research undertaken with the use of transmission electron microscopy, it was found that the hardening mechanism of the X98 and X105 steel is deformation-induced plasticity by the formation of shear bands (SIP) and micro shear bands (MBIP).
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 5; e137412, 1--7
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Maximum Piston Velocity on Internal Homogeneity of AlSi9Cu3(Fe) Alloy Processed by High-Pressure Die Casting
    Autorzy:
    Matejka, Marek
    Bolibruchowá, Dana
    Podprocká, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2203939.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Al-Si-Cu alloy
    high-pressure die casting
    porosity
    Brinell hardness
    microstructure
    stop Al-Si-Cu
    odlewanie wysokociśnieniowe
    porowatość
    twardość Brinella
    mikrostruktura
    Opis:
    High-pressure die casting results in a high quality surface and good mechanical properties of castings. Under the effect of pressure, integral and solid castings are achieved without a large number of foundry defects. The correct and proper setting of technological parameters plays a very important role in minimizing casting defects. The aim of the presented article is to determine the optimum maximum piston velocity for a casting in the high-pressure casting process with two height variants, depending on their internal quality. It is because the internal quality of particular castings is important in terms of proper functionality in operations where the biggest problem is the porosity of the casting. The main cause of porosity formation is the decreasing solubility of gases (most often hydrogen) during the melt solidification. Solubility represents the maximum amount of gas that can dissolve in a metal under equilibrium conditions of temperature and pressure. Macroporosity and microporosity were determined from the sections of the surfaces in the determined zones of the castings. Here, the results was that the macroporosity decreased with increasing piston velocity. Ideal microstructure was evaluated at a piston velocity of 3 m/s for both types of castings. On the other hand, the increase in tube size has shown that velocities of 3 m/s and higher, the tube is more prone to macroporosity formation. The highest hardness was achieved at the piston velocity of 2 m/s at both tube lengths.
    Źródło:
    Archives of Foundry Engineering; 2022, 22, 4; 34--40
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Corrosion Behavior of Hastelloy® C-2000® Ni-Cr-Mo-Fe Alloys in the Entrained-Flow Coal Gasification Syngas Plants
    Autorzy:
    Lee, Sungkyu
    Kim, Min-Jung
    Choi, Nuri
    Hwang, Sang Yeon
    Chung, Seok-Woo
    Lee, Seung-Kong
    Yun, Yongseung
    Powiązania:
    https://bibliotekanauki.pl/articles/352403.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    mixed oxidant corrosion
    Hastelloy® C-2000® Ni-Cr-Mo-Fe alloy
    coal gasification
    high temperature halogencorrosion
    hydrated chlorides
    Opis:
    A mechanistic exposure experiment was performed on the commercially available and welded Ni-Cr-Mo-Fe alloy samples used in the piping materials of the coal gasification pilot plant. Thermodynamic Ellingham-Pourbaix stability diagrams were constructed to provide insight into the mechanism of the observed corrosion behavior. The thermodynamic inference on the corrosion mechanism was supplemented with the morphological, compositional and microstructural analyses of the exposed samples using scanning electron microscopy, X-ray diffraction and energy-dispersive X-ray spectroscopy analyses. X-ray diffraction result revealed stable corrosion products of NiO, MoNi4 and Cr4.6 MoNi2.1 after accumulated total exposure duration of 139 h to the corrosive atmosphere. Scanning electron microscopy and energy-dispersive X-ray spectroscopy positively identified formation of rather continuous and adherent pre-oxidation corrosion products although extensively peeled-off oxides were finally observed as corrosion scales on the post-exposure alloy samples, which were attributed to the chlorination/oxidation into thin (spalled) oxides.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 2; 869-878
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Temperature Dependent Variations of Properties of Polymer-Like Carbon Coatings Treated with High Energy Electrons
    Autorzy:
    Plaipaitė-Nalivaiko, R.
    Vigricaitė, L.
    Adlienė, D.
    Rutkūnienė, Ž.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402232.pdf
    Data publikacji:
    2015-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.80.Fe
    68.37.Ps
    78.30.Jw
    78.70.-g
    Opis:
    Polymer-like carbon coatings can be used for the protection of micro-electromechanical devices functioning in chemically or radiation harsh environment due to their beneficial properties. Properties of carbon coatings depend on the method of synthesis, initial gas mixture, admixture of additives, temperature and other technological parameters. Modification of carbon structures is possible applying high energy electrons. Coating mechanical properties become almost stable after their pretreatment with some doses of high energy electrons. Polymer-like carbon coatings were synthesized from acetylene gas plasma on n-type silicon substrates in the RF plasmotron system at temperatures in the range 293-673 K using plasma enhanced chemical vapor deposition method. Series of samples were prepared and irradiated with high energy (6 MeV) electrons in a medical linear accelerator. The ellipsometric method was used for estimation of some optical parameters and thickness of synthesized coatings. Structural changes of polymer-like carbon coatings were evaluated using the Raman spectroscopy and surface morphology was assessed by atomic force microscopy. Electron beam induced structural changes in the coatings were analyzed using the obtained results. The relations between the synthesis temperature and samples structure and surface morphology are discussed.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 5; 915-917
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Isothermal Heating Time on the Disappearance of Strain Hardening in High-Manganese TRIPLEX Type Steels
    Autorzy:
    Sozańska-Jędrasik, L.
    Mazurkiewicz, J.
    Borek, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/351838.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Fe-Mn-Al-C steels
    TRIPLEX steel
    thermo-mechanical processing
    softening degree
    Opis:
    The paper presents the results of the effect of isothermal heating time on the disappearance of strain hardening (the softening degree) of the studied high-manganese TRIPLEX type steels at a temperature of 900 and 1000°C. In order to determine the kinetics of recrystallization of austenite plastically deformed for selected steels, hot compression tests with draft ε = 0.2 were made. The presented results reveal that the complete recrystallization of austenite needs long isothermal heating times. In industrial conditions, such long times are not used, therefore in the initial rolling passages, the time required for half recrystallization of austenite t0.5 is often used. The total disappearance of the strain hardening, completion of the recrystallization of austenite tested high-manganese X98 and X105 TRIPLEX type steels isothermal heating time requires far more than 200 s. The increase of the deformation temperature is a factor influencing the acceleration of the disappearance of strain hardening.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 4; 2023-2030
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Additive Element on the Properties of Mechanically Alloyed Fe-Y2O3 Alloys
    Autorzy:
    Ahn, J.-H.
    Kim, T. K.
    Ahn, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/356561.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    mechanical alloying
    ODS alloy
    nanoparticles
    oxide dispersion strengthening
    high-energy ball milling
    Opis:
    In the present work, we have examined the effect of Ti on the properties of Fe-Y2O3 alloys. The result showed that the addition of Ti was effective for improving mechanical properties. This is due to the reduction of oxides by Ti during mechanical alloying and hot-consolidation. In particular, iron oxides are effectively reduced by the addition of Ti. Compared to the pristine Fe-Y2O3 alloys, titanium-added alloys exhibited fine and uniform microstructures, resulting in at least 60% higher tensile strength.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 2B; 1043-1046
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling nearshore hydrodynamics and circulation under the impact of high waves at the coast of Varkiza in Saronic-Athens Gulf
    Autorzy:
    Belibassakis, K.A.
    Karathanasi, F.E.
    Powiązania:
    https://bibliotekanauki.pl/articles/47934.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    sediment transport
    shoreline
    modelling
    hydrodynamics
    Saronic Gulf
    coastal zone
    wind
    wave
    Opis:
    A plethora of physical parameters, such as hydro-, litho- and morpho-dynamic char- acteristics, are essential for understanding the response of coastal systems to intense sea states in terms of sediment transport and shoreline evolution. Nowadays, numerical models are extensively applied to meet the above needs and support coastal planning and management. In the present work, a 2DH dynamic modelling system is used for simulating the hydrodynamic and meteorological/ oceanographic characteristics of the Saronic Gulf, in order to examine circulation patterns and predict sediment transport phenomena under high wave conditions at the coast of Varkiza, a sandy beach in the southern Attica, Greece. Time series of wind and wave data were used as input at the open boundaries of the model domain while the model was calibrated and validated through (linear and directional) statistical measures with respect to in situ wave measurements, since there was lack of hydrodynamic data at the site of interest.The simulation period of the model was between January 3 and February 19, 2013, with consecutive high waves in-between. The good agreement of the numerical results from the wave and hydrodynamic model with in situ measurements confirmed the suitability of the model for the support of sediment transport rates at Varkiza coastal segment. Model results reveal that there is a counter-clockwise water circulation during high waves that contribute to the erosion of the examined beach, which is also confirmed by independent field measurements.
    Źródło:
    Oceanologia; 2017, 59, 3
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural Mechanism of the High-Damping State Formation in the Fe-Mn-Si Shape Memory Alloys
    Autorzy:
    Udovenko, V. A.
    Polyakova, N. A.
    Turmambekov, T. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2011038.pdf
    Data publikacji:
    1999-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.16.-d
    75.50.Bb
    75.60.Ej
    75.80.+q
    Opis:
    The structural mechanism of the high-damping state formation in the Fe-Mn-Si alloys has been investigated using transition electron microscopy and logarithmic decrement measurements. The high level of the elastic energy dissipation was found to be connected with a reversible movement of the Shockley dislocations under the sign changing stress action. The Shockley dislocations density and mobility are controlled by the alloys compositions and prior deformation value. The increase in the dislocations density with the help of the special cycling treatments can improve the alloys damping capacity.
    Źródło:
    Acta Physica Polonica A; 1999, 96, 2; 307-310
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High-Pressure Mössbauer Studies of Magnetism in ScFe$\text{}_{2}$ and Sc$\text{}_{0.4}$Ti$\text{}_{0.6}$Fe$\text{}_{2}$ Laves Phases
    Autorzy:
    Rupprecht, K.
    Lu, J.
    Wortmann, G.
    Przewoźnik, J.
    Żukrowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2029022.pdf
    Data publikacji:
    2001-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Bb
    76.80.+y
    Opis:
    We report on $\text{}^{57}$Fe-Mössbauer studies of the magnetic properties in ScFe$\text{}_{2}$ and Sc$\text{}_{0.4}$Ti$\text{}_{0.6}$Fe$\text{}_{2}$ performed as a function of pressure and temperature. Both systems crystallize in the C14-type Laves phase structure with two different Fe sites 6h and 2a. The ferromagnetic properties of ScFe$\text{}_{2}$ (T$\text{}_{C}$=540 K at ambient pressure) change around 30 GPa to antiferromagnetic order of the 6h sites with non-magnetic 2a sites. The ordering temperature is lowered to T$\text{}_{N}$=300 K at 51 GPa. This pressure-dependent behaviour of ScFe$\text{}_{2}$ resembles that observed within the Sc$\text{}_{1-x}$Ti$\text{}_{x}$Fe$\text{}_{2}$ series as a function of x. In ferromagnetic Sc$\text{}_{0.4}$Ti$\text{}_{0.6}$Fe$\text{}_{2}$ we observe, as a function of temperature and of pressure, an abrupt high-moment to low-moment transition of the Fe band moments of the 6h sites, accompanied by a rearrangement of the spin directions. In both systems the decrease in the Fe moments is accompanied by a strong increase in the volume coefficient of the isomer shift, originating from a reduced s-electron shielding capability of the d-electrons in the low-moment state.
    Źródło:
    Acta Physica Polonica A; 2001, 100, 5; 789-797
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fabrication of High-Strength Gray Cast Iron Using Permanent Magnet Scrap
    Autorzy:
    Park, S.-Y.
    Kim, J. H.
    Seo, S. J.
    On, J. S.
    Lim, K. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/352204.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    gray cast iron
    rare earth element
    Nd-Fe-B magnet scrap
    graphite formation
    microstructure
    Opis:
    In this study, we have developed the manufacturing technology for high strength gray cast irons by using the spent permanent magnet scraps. The cast specimen inoculated by using a spent magnet scraps showed the excellent tensile strength up to 306MPa. This tensile strength value is 50MPa higher than that of the specimen cast without inoculation, and is similar to that of the specimen inoculated by using the expensive misch-metal. These superior mechanical properties are attributed to complex sulfides created during solidification that promote the formation and growth of Type-A graphite. It is therefore concluded that spent magnets scrap can provide an efficient and cost-effective inoculation agent for the fabrication of high-performance gray cast iron.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 2B; 1113-1117
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Thermal Processing in High Magnetic Field on Soft Magnetic Properties and Crystallographic Texture of Non-Oriented Fe-Si Steels
    Autorzy:
    Petryshynets, I.
    Kováč, F.
    Marcin, J.
    Škorvánek, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032640.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Kj
    61.72.-y
    68.55.jm
    75.60.Nt
    75.50.Vv
    Opis:
    In this work, we report on the effects of high static magnetic field on the formation of desirable crystallographic orientation of grains ("rotating" cube) during the primary recrystallization of non-oriented steels. Vacuum degassed non-oriented steel with the silicon content about 1 wt% was taken from industrial line after final cold rolling with 80% of deformation and then it was subjected to the laboratory annealing at temperature of primary recrystallization. Whole annealing process was carried with and without the applied external magnetic field of 14 T. The analysis of crystallographic orientation of experimental material was studied by electron backscattered diffraction technique. The microstructural and textural observations have shown a small difference in average grain size between samples annealed with and without magnetic field as well as increase of the "rotating" Cube component and decrease of the intensity of deformation texture by application of magnetic field. The magnetic measurements show that the coercivity value of the sample annealed in the magnetic field of 14 T can be reduced by approximately 3% in comparison with sample annealed under the zero field conditions.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 783-785
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Technologie przeróbcze uszlachetniania, zawierających części palne, popiołów lotnych z węgli kamiennych spalanych w elektrociepłowniach
    Treatment processes for utilization of high carbon fly ashes from combustion of black coal in thermal power plants
    Autorzy:
    Michalikova, F.
    Skvarla, J.
    Sisol, M.
    Krinicka, I.
    Kolesarova, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/317933.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    popiół z węgla kamiennego
    pozostałości niespalonego węgla PNW
    straty prażenia (StP)
    koncentraty Fe
    flotacja
    separacja magnetyczna
    black coal ash
    unburned coal residues (UCR)
    loss on ingition (LOI)
    Fe-concentrates
    flotation
    magnetic separation
    Opis:
    W artykule przedstawiono potencjalne przeróbcze technologie uszlachetniania popiołów lotnych z węgla kamiennego spalanego w kotłach topiących, które umożliwiają uzyskanie produktów znajdujących zastosowanie - niespalonych pozostałości węgla, koncentratów Fe, uszlachetnionych popiołów lotnych przydatnych głównie w budownictwie. Poszczególne produkty uzyskano w procesie flotacji i separacji w słabym polu magnetycznym. Uzyskane produkty są przydatne w przemyśle. Wyniki testów laboratoryjnych stanowią podstawę do oceny możliwości utylizacji tego typu popiołów w budownictwie i prekursorycznie do produkcji geopolimerów.
    The article presents potential treatment technologies for black coal ash from melting boilers and opportunities for utilization of obtained products - unburned coal residues, Fe-concentrates and fly ash cleaned from unburned coal particles utilizable mostly in building industry. Single useful components were separated by the process of flotation and wet magnetic low-intensity separation. Obtained products are industrially utilizable. The results of laboratory tests are the basis for evaluation the possibilities for utilization this type of fly ashes as a precursors for geopolymer production and for utilization in building industry.
    Źródło:
    Inżynieria Mineralna; 2010, R. 11, nr 1-2, 1-2; 9-26
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza przepływu metodą elementów skończonych w systemach wysokociśnieniowych maszyn do obróbki wodno-ściernej
    The analysis of flow using the FE method at the high pressure systems of AWJ machines
    Autorzy:
    Wala, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/270080.pdf
    Data publikacji:
    2012
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    obróbka wodno-ścierna (WATERJET)
    analiza przepływowa
    metoda elementów skończonych
    waterjet machining
    flow analysis
    finite element method
    Opis:
    Artykuł przedstawia analizę wpływu pracy pompy wysokociśnieniowej na wytwarzane ciśnienie jako źródło energii strumienia tnącego. Ze względu na sposób pracy pompy wysokociśnieniowej wartość ciśnienia rzeczywistego na wyjściu cyklicznie zmienia się w czasie. Wynika to ze sposobu pracy multiplikatora. W ramach badań wykazano, że to właśnie ten charakter zmian obciążeń ma główny wpływ na zużycie elementów głowicy tnącej. W części wstępnej artykułu przedstawiono kierunki badań w dziedzinie obróbki wodno-ściernej, będące analizą dotychczasowych prac wykonanych w ramach obróbki wodno-ściernej.
    The article shows the influence of high pressure pump work on generated pressure as source of kinetic energy outlet water jet. Due to specific character of high pressure pump work the value of real pressure cyclical changes over time. The study proved that the nature of the changes loads have a major impact on the cutter head wear. Introduction presents the directions of research in the field of abrasive waterjet machining. It is an analysis of previous work done in the treatment of AWJM method.
    Źródło:
    Inżynieria Maszyn; 2012, R. 17, z. 3; 74-83
    1426-708X
    Pojawia się w:
    Inżynieria Maszyn
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-73 z 73

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