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Wyszukujesz frazę "precipitation behavior" wg kryterium: Wszystkie pola

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    Wyświetlanie 1-6 z 6
    Tytuł:
    Research on the Characterization of Ti Inclusions and Their Precipitation Behavior in Tire Cord Steel
    Autorzy:
    Lei, Jialiu
    Zhao, Dongnan
    Fu, Yongjun
    Xu, Xianfeng
    Powiązania:
    https://bibliotekanauki.pl/articles/383339.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    precipitation behavior
    Ti inclusions
    concentration product
    tire cord steel
    characterization
    linka stalowa
    wtrącenia Ti
    odpady
    Opis:
    In the present investigation, the morphology of Ti inclusions in high strength tire cord steel was investigated and their precipitation behavior was discussed using a precipitation and growth model. The results show that Ti inclusions mainly exist in the form of TiN. The two-dimensional characterization of Ti inclusions is square-like with sharp edges and corners, while its three-dimensional shape exhibits a cubic or rectangular-prism morphology. The Ti inclusions do not precipitate when the solid fraction of tire cord during solidification is less than 0.987, and their final radius is closely related to the cooling rate and initial concentration product. The higher the cooling speed, the smaller the final radius, when the cooling speed is constant, the final radius of Ti inclusions is mainly determined by the initial concentration product, w[N]0×w[Ti]0. In order to retard the precipitation and growth of Ti inclusions in tire cord steel, the cooling rate and initial concentration product can be taken into consideration.
    Źródło:
    Archives of Foundry Engineering; 2019, 3; 33-37
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tem Observation Of Age-Hardening Precipitation In Mg-Gd-Y Alloys As Different Gd/Y Ratio
    Zastosowanie mikroskopii TEM do obserwacji wydzieleń po utwardzaniu wydzieleniowym w stopach Mg-Gd-Y o różnych stosunkach Gd/Y
    Autorzy:
    Matsuoka, Y.
    Watanabe, K.
    Nakamura, J.
    Lefebvre, W.
    Saikawa, S.
    Ikeno, S.
    Matsuda, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/351744.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Mg-RE alloy
    precipitation behavior
    TEM
    HAADF-STEM
    stop Mg-RE
    zachowanie wydzieleń
    transmisyjna mikroskopia elektronowa (TEM)
    Opis:
    In this study, the early stage of aging in Mg-Gd-Y alloys has been observed by transmission electron microscopy (TEM), high angle annular dark field – scanning transmission electron microscopy (HAADF-STEM) and calculations of images and electron density and bond overlap population (BOP) by first principal to understand the origin of precipitation in this alloy. The small hexagon of 0.37 nm is the first precipitate in this alloy, and this is the evidence of short range ordering of D019 structure. This is referred as the pre β”-phase. In the peak aged condition, β’ phase with bco structure was mainly observed.
    W pracy przedstawiono mikroskopowe obserwacje TEM wczesnego etapu starzenia stopów Mg-Gd-Y. Ponadto badania prowadzono z użyciem skaningowej transmisyjnej mikroskopii elektronowej. Wykorzystano zjawisko niekoherentnego rozpraszania w ciemnym polu i materiał obrazowano przy pomocy detektora pierścieniowego, który zbiera elektrony rozproszone pod dużymi kątami (HAADF-STEM). Przeprowadzono także analizę obrazów, obliczenie gęstości elektronowej i ilości nakładających się wiązań w celu zrozumienia źródła wydzieleń w ww. stopie. Pierwszym wytrąceniem w stopie jest mały sześciokąt o wielkości 0,37 nm, a dowodem tego jest uporządkowanie krótkiego zasięgu struktury D019.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 2A; 971-972
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of Wear Behavior of Precipitation-Strengthened Nickel-Copper Based K-500 Alloy Produced by Powder Metallurgy
    Autorzy:
    Esgin, U.
    Özyürek, D.
    Kaya, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398716.pdf
    Data publikacji:
    2016-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.40.Pq
    Opis:
    The present study investigates the effects of the ageing parameters of the precipitation-strengthened nickel-copper based K-500 alloy produced by powder metallurgy on the wear behavior of the alloy. After the cold pressing the prepared alloy powders under 600 MPa pressure, the samples were sintered under vacuum (10¯⁶ mbar) at 1150°C for 2 h and then cooled in the furnace. Produced K-500 alloy samples were taken into solution at 980°C for 1 h and quenched. Ageing process was carried out at 480°C for four different time periods (6, 8, 10, and 12 h). Aged samples were examined transmission electron microscope (TEM + EDS), X-ray diffraction (XRD), hardness and density measurements. The wear tests were carried out at 1 ms¯¹ constant sliding speed, under 40 N load and for five different sliding distances (400-2000 m). The results showed that there is γ' Ni₃(Al, Ti) inter-metallic phase coexisting with $Al_{0.9}Ni_{4.22}$, AlNi₃ and NiO phases. According to the hardness measurements, the highest hardness values were obtained with samples aged for 8 h. In wear tests with 2000 m sliding distance, the lowest weight loss was observed for the samples aged for 8 h.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 4; 544-547
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis, Characterization and Sensing Behavior of WO₃ Nanocrystalline Powder for Toluene Vapor
    Autorzy:
    Boran, F.
    Çetinkaya, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031559.pdf
    Data publikacji:
    2017-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    tungsten oxide
    direct precipitation technique
    toluene
    Opis:
    Tungsten oxide (WO₃) nanocrystalline powder was successfully synthesized by direct precipitation technique starting from sodium tungstate dehydrate (Na₂WO₄·2H₂O) as precursor at 80°C for 48 h. The morphological characteristics, distribution, and crystallite size of WO₃ nanocrystalline powder were analysed by transmission electron microscopy, X-ray diffraction, and the Fourier transform infrared spectroscopy. According to transmission electron microscopy results, the mean particle size of WO₃ nanocrystalline powder was approximately determined as 41.7 nm. The gas sensing performance of WO₃ nanocrystalline powder for saturated toluene vapor was measured by two probe resistivity unit in a closed vessel at room temperature. In addition, WO₃ nanocrystalline powder was able to respond the lowest concentration of 500 ppm. The results showed that the sample exhibited high sensitivity (93%) and good response reproducibility (0.93+5.5%) for toluene vapor.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 3; 572-573
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructural Evolution and Oxidation Behavior of Fe-4Cr-6Ti Ferritic Alloy with Fe2Ti Laves Phase Precipitates
    Autorzy:
    Demirel, Ahmet
    Çetin, Emre Can
    Karakuş, Ali
    Ataş, Mehmet Şahin
    Yildirim, Mehmet
    Powiązania:
    https://bibliotekanauki.pl/articles/2125526.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ferritic alloy
    microstructure
    precipitation hardening
    laves phase
    oxidation
    Opis:
    The microstructural properties and hardness of a model ternary Fe-4Cr-6Ti ferritic alloy aged at 800°C for 8, 16 and 24 h are investigated in detail. Fine Fe2Ti Laves phase particles precipitate in the α-Fe (ferrite) matrix phase after solutionizing and subsequent aging treatments. The size and amount of Fe2Ti precipitates gradually increase with increasing aging time. The magnetic measurements of the aged samples confirm the variations in the microstructural properties including the volume fraction of the constituent phases, and Ti content of the α-Fe matrix phase. The mean Vickers microhardness value also increases from 203.5 to 238.4 with increasing aging time from 8 to 24 h. In addition, the cyclic oxidation behavior of 24 h aged sample, which contains maximum amount of Fe2Ti precipitates, is also investigated in detail. X-ray diffraction analysis reveals that scale product is α-Fe2O3 (hematite). Significant scale spallation and void formation is observed on the surfaces of 24 h aged Fe-4Cr-6Ti sample oxidized at 500°C.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 3; 827--836
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical behavior of wheel steels with solid solution and precipitation hardening
    Autorzy:
    Kulyk, V. V.
    Shipitsyn, S. Ya.
    Ostash, O. P.
    Duriagina, Z. A.
    Vira, V. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/378578.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    railway wheel steel
    alloying
    resistance to flat formation
    wear
    damaging
    stalowe koło kolejowe
    stopowanie
    odporność na formowanie płaskie
    zużycie
    uszkodzenia
    Opis:
    Purpose: The aim of the proposed research is to investigate operational properties of a wheel steel treated with simultaneous solid solution and precipitation hardening at various carbon content, in comparison with the standard wheel grade T steel. Design/methodology/approach: The mechanical behaviour of wheel steels with increased content of silicon, manganese, vanadium, and nitrogen at various carbon content has been investigated and compared to that of the standard high-strength wheel grade T steel. The steels were undergo thermal treatment due to austenitic heating up to a temperature of 950.C with cooling down in water to 550.C followed by intense blowing of blanks in the air. After that, a tempering was performed at a temperature in the range of 450-650.C. Static strength (UTS), relative elongation (TEL), impact toughness tests (KCV) were determined on standard specimens. The characteristics of Mode I fatigue crack growth resistance of steel were determined on the basis of fatigue macrocrack growth rate diagrams da/dN–ΔKI, obtained by the standard method on compact specimens with the thickness of 10 mm at a frequency of 10-15 Hz and the stress ratio R = 0.1 and R = 0.5 of the loading cycle. The characteristics of Mode II fatigue crack growth resistance were determined on the basis of da/dN–ΔKII diagrams, obtained earlier method on edge notched specimens with the thickness 3.2 mm at a frequency of 10-15 Hz and R = -1 taking account of the crack face friction. Rolling contact fatigue testing was carried out on the model specimens. Findings: The regularities of the change of mechanical characteristics of the high-strength wheel steel with simultaneous solid solution and precipitation hardening at lowered carbon content under static, impact and cyclic loading are studied. Research limitations/implications: The results obtained using laboratory samples should be checked during a real railway wheels investigation. Practical implications: The investigated steel with simultaneous solid solution and precipitation hardening provides high wear resistance of the tread surface and damage resistance determined on the model wheels. Originality/value: A steel with solid solution hardening due to increased content of silicon (up to 0.7%) and manganese (up to 0.8%) and also with precipitation hardening (at optimal content of vanadium and nitrogen [V‧N]‧104 = 28.9%) at lowered carbon content (0.52) possesses high strength and fatigue fracture toughness in cases of Mode I and Mode II loading, causing better combination of wear and damage resistances of the tread surface of the model wheels, as compared to corresponding parameters for grade T steel.
    Źródło:
    Archives of Materials Science and Engineering; 2019, 95, 2; 49-54
    1897-2764
    Pojawia się w:
    Archives of Materials Science and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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