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Tytuł:
Surface Decorations of Al-Cu-Fe and Al-Cu-Co Single Quasicrystals
Autorzy:
Surowiec, M.
Bogdanowicz, W.
Krawczyk, J.
Sozańska, M.
Powiązania:
https://bibliotekanauki.pl/articles/1373609.pdf
Data publikacji:
2014-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.44.Br
Opis:
We studied surface decorations of faceted icosahedral Al-Cu-Fe and decagonal Al-Cu-Co single quasicrystals by the scanning electron microscopy using primary and secondary electrons. Both types of single quasicrystals exhibited decorations on their facets, however the character of the decorations was totally different. Three kinds of decorations has been developed. On icosahedral $Al_{60}Cu_{26}Fe_{14}$ quasicrystals we found three kinds of decorations: cellular, cavity type and fractal-like. There was no evident difference in chemical composition between the inner dodecahedra and the decorations of all types. Surface decorations found on decagonal $Al_{73.5}Cu_{17.5}Co_9$ quasicrystals formed a kind of irregular dendritic stars on the separate bright islands.
Źródło:
Acta Physica Polonica A; 2014, 126, 2; 597-598
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dielectric Spectroscopy Studies of 4-Cyano-3-fluorophenyl 4-Butylbenzoate Liquid Crystal at High Pressure
Autorzy:
Rozwadowski, T.
Massalska-Arodź, M.
Juszyńska, E.
Krawczyk, J.
Wojnarowska, Ż.
Paluch, M.
Powiązania:
https://bibliotekanauki.pl/articles/1419574.pdf
Data publikacji:
2012-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.70.M-
77.22.Gm
Opis:
For 4-cyano-3-fluorophenyl 4-butylbenzoate, nematic glassformer at ambient pressure, dielectric relaxation studies were performed under elevated pressure. In the isobaric experiment, on cooling the nematic phase two superarrhenius α-relaxations, ascribed to the reorientations of molecules around short axes and precession of long molecular axes were found and the Arrhenius β-relaxation related to intramolecular motions. Complexity of dynamics at elevated and ambient pressure is similar. Shift towards lower frequencies was found for both α-relaxations.
Źródło:
Acta Physica Polonica A; 2012, 122, 2; 378-381
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hygiene, ways of storage and lifetime of removable dentures
Autorzy:
Krawczyk, J.
Bozyk, A.
Kiworkowa-Raczkowska, E.
Berger, M.
Bakalczuk, M.
Szkutnik, J.
Pietryka-Michalowska, E.
Wdowiak, A.
Sapula, M.
Powiązania:
https://bibliotekanauki.pl/articles/3601.pdf
Data publikacji:
2015
Wydawca:
Instytut Medycyny Wsi
Tematy:
human hygiene
hygiene
storage
removable denture
denture
Opis:
Hygiene plays an important role in patients who use removable dentures. The proper way of cleaning and storage also provides better health of oral cavity tissues as well as for the remaining teeth. The research involved 162 patients, 133 women and 29 men, aged 60–90, with different levels of education, the majority with secondary education. All patients were using removable dentures. 85.8% declared earlier use of dentures, and a half of the patients had used dentures for no more than 7.5 years. A considerable percentage (33.95%) used dentures for the whole day. Storing in a container with fluid was used by 25.93% of the respondents. Over 70% used toothpaste to clean their dentures and about 14% immersed them in special preparations, e.g. CoregaTabs, while over 8% used soap. Among patients who cleaned their dentures, the majority cleaned them once a week (75%) and the minority – twice a week (25%). The greatest percentage of patients cleaned their dentures with a toothbrush and toothpaste, which is not recommended due to occurring microabrasions. It is recommended that patients should be educated regarding prosthesis hygiene and regular follow-ups.
Źródło:
Journal of Pre-Clinical and Clinical Research; 2015, 09, 1
1898-2395
Pojawia się w:
Journal of Pre-Clinical and Clinical Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wear Mechanisms Analysis of Dies Used in the Process of Hot Forging a Valve Made of High Nickel Steel
Autorzy:
Hawryluk, M.
Gronostajski, Z.
Kaszuba, M.
Krawczyk, J.
Widomski, P.
Ziemba, J.
Zwierzchowski, M.
Janik, M.
Powiązania:
https://bibliotekanauki.pl/articles/351102.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
tool wear
tools durability
destructive mechanisms
valve engine
high nickel steel
Opis:
The study presents a durability analysis of dies used in the first operation of producing a valve-type forging from high nickel steel assigned to be applied in motor truck engines. The analyzed process of producing exhaust valves is realized in the forward extrusion technology and next through forging in closed dies. It is difficult to master, mainly due to the increased adhesion of the charge material (high nickel steel) to the tool’s substrate. The mean durability of tools made of tool steel W360, subjected to thermal treatment and nitriding, equals about 1000 forgings. In order to perform a thorough analysis, complex investigations were carried out, which included: a macroscopic analysis combined with laser scanning, numerical modelling by FEM, microstructural tests on a scanning electron microscopy and light microscopy (metallographic), as well as hardness tests. The preliminary results showed the presence of traces of abrasive wear, fatigue cracks as well as traces of adhesive wear and plastic deformation on the surface of the dies. Also, the effect of the forging material being stuck to the tool surface was observed, caused by the excessive friction in the forging’s contact with the tool and the presence of intermetallic phases in the nickel-chromium steel. The obtained results demonstrated numerous tool cracks, excessive friction, especially in the area of sectional reduction, as well as sticking of the forging material, which, with insufficient control of the tribological conditions, may be the cause of premature wear of the dies.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 4; 1963-1974
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wybrane własności tribologiczne stopu z grupy FeAl
Chosen tribological properties of FeAl alloys
Autorzy:
Śleboda, T.
Krawczyk, J.
Bednarek, S.
Wojtaszek, M.
Paćko, M.
Powiązania:
https://bibliotekanauki.pl/articles/189050.pdf
Data publikacji:
2011
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
stopy Fe-Al
zużycie
współczynnik tarcia
FeAl alloys
wear
friction coefficient
Opis:
W ramach przedstawionych badań analizie poddano własności tribologiczne stopów z grupy FeAl. Jako materiał wyjściowy do badań zastosowano stop FeAl w formie odlewu oraz otrzymany z proszku stopu. Dyskusji poddany został wpływ morfologii materiału wyjściowego do badań na jego własności tribologiczne. Badania tribologiczne wykonano w temperaturze pokojowej na testerze T-05 przy zmiennych obciążeniach. Jako przeciwpróbkę zastosowano stal narzędziową HS6-5-2. Układ tribologiczny składał się z pierścienia (przeciwpróbka) oraz płaskiej powierzchni (próbka). Zbadano wpływ stosowanego obciążenia na zużycie badanych materiałów oraz zmiany współczynnika tarcia. Na podstawie przeprowadzonych badań można stwierdzić, że morfologia stopów FeAl ma duży wpływ na własności tribologiczne tego typu materiałów, a w szczególności na rodzaj mechanizmów zużycia tribologicznego.
This research was focused on tribological properties of FeAl 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 room temperature, using a T-05 testing device, under various testing conditions. HS6-5-2 tool steel was used as counter-sample. The tribological set up consisted of a ring (counter-sample) and flat surface of the investigated sample. The effect of tribological testing load on the wear and friction coefficient of the investigated materials was analysed. The obtained results indicated that the morphology of FeAl alloys has significant influence on tribological properties of these alloys and on the mechanisms of wear in particular.
Źródło:
Tribologia; 2011, 4; 253-261
0208-7774
Pojawia się w:
Tribologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Molecular Dynamics of 4-Cyano-3-Fluorophenyl 4-Butylbenzoate as Studied by Dielectric Relaxation Spectroscopy
Autorzy:
Massalska-Arodź, M.
Krawczyk, J.
Juszyńska, E.
Kocot, A.
Inaba, A.
Powiązania:
https://bibliotekanauki.pl/articles/1538189.pdf
Data publikacji:
2010-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.70.kj
64.70.M-
77.22.Gm
Opis:
Dielectric α-relaxation connected with reorientations of the 4-cyano-3-fluorophenyl-4-butylbenzoate molecules around short axes in the isotropic and nematic phases is presented. In the nematic phase the super-Arrhenius temperature dependence of the relaxation has been found. Vitrification of the supercooled nematic phase is shown. Below glass transition temperature the secondary β-relaxation has been identified and described well by the Arrhenius temperature dependence on cooling and on heating. After softening of glass to the metastable nematic phase a spontaneous crystallization occurs as for some other low-weight molecular glass formers.
Źródło:
Acta Physica Polonica A; 2010, 117, 4; 532-536
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructural characteristic of hypereutectoid iron alloys melted in ArcMelter furnace
Autorzy:
Frocisz, Ł.
Krawczyk, J.
Kozieł, T.
Goły, M.
Tokarski, T.
Wieczerzak, K.
Powiązania:
https://bibliotekanauki.pl/articles/1075751.pdf
Data publikacji:
2016-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.F-
64.70.kd
Opis:
ArcMelter furnace is commonly used as a method for synthesis of amorphous and nanocrystalline materials. Due to easy and precise chemical composition control, also short time of whole process, this method was used to synthesis of new model hypereutectoid iron alloys. Material for the investigation was 90CrV6 steel. The chemical composition of this steel was modified to obtain the increase of carbides volume fraction with preserving the same chemical composition and mechanical properties of the matrix. The melt was conducted at sub atmospheric pressure of argon. The obtained materials were chemically analyzed by the use of optical emission spectrometer. The metallographic analysis was performed by the use of microscope. Phase composition in cast state was analyzed by X-ray diffraction. Chemical composition of the ingots differed from the previously established compositions in the range of 0.08 mass percentage. The high cooling rate resulted in dendritic character of the obtained microstructures. The microstructure of modified tool materials was plate martensite with large amount of retained austenite. The stress induced martensitic transformation in the crack area was observed. Retained austenite destabilization was initiated by the stress relaxation related with material cracking.
Źródło:
Acta Physica Polonica A; 2016, 130, 4; 939-941
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of cavitation erosion on austenitic-ferritic steel
Autorzy:
Krawczyk, J.
Jasionowski, R.
Ura, D.
Goły, M.
Frocisz, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/135269.pdf
Data publikacji:
2018
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
cavitation
austenite destabilization
duplex steel
erosion wear
plastic deformation
material
Opis:
Cavitation is a one of many wear mechanisms which are related to the flow of liquid. It is one of the most destructive wear methods for stainless materials. The local changes in the pressure of the liquid stream related to the flow across the metal component cause straightening of the surface area, as well as its erosion and the formation of pits on the surface layer. The erosion value of cavitation is related to the material’s microstructure, the geometry of the element, the phase composition of the material and the surface roughness. In this paper the investigation of the cavitation process for duplex stainless steel has been performed. Samples examined in the first stages of the experiments were not significantly changed, but after a long time the hardness increase was very visible. The result of the cavitation was also cracking along the interphase boundaries, which resulted in the chipping of the material. One of the most important results was a description of the change in the wear mechanisms and its intensity during the cavitation exposure time. At first plastic micro deformation of the material’s surface occurred, then the plastic deformation increased significantly and after some time this resulted in erosion of the material and interfacial boundary decohesion; these two effects increased simultaneously. The last of the mechanisms was mechanical destabilization of the austenite, but the clear result of the mechanical destabilization of the austenite was only observed in the last sample. Martensitic transformation of the material changed the material’s mechanical properties, but for the stainless steels this resulted in electrochemical corrosion of the material, especially through the formation of an electrochemical potential between austenite and martensite.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2018, 56 (128); 30-35
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Productivity of laying hens in different production systems
Produkcyjność kur nieśnych w różnych systemach chowu
Autorzy:
Sokołowicz, Z.
Krawczyk, J.
Dykiel, M.
Powiązania:
https://bibliotekanauki.pl/articles/2604918.pdf
Data publikacji:
2018
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
laying hen
productivity
production system
free-range system
organic system
Źródło:
Acta Scientiarum Polonorum. Zootechnica; 2018, 17, 2; 23-30
1644-0714
Pojawia się w:
Acta Scientiarum Polonorum. Zootechnica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Role of Microstructure in High Temperature Tribology of Iron Alloys
Autorzy:
Krawczyk, J.
Rożniata, E.
Zimowski, S.
Kot, M.
Dąbrowski, R.
Dziurka, R.
Frocisz, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/355366.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
microstructure
tribology
iron alloys
cast steel
wear
cementite
Opis:
The present paper describe the issue of tool materials wear in a high temperature conditions. The investigations were performed at the cast steel tool material at the tribological contact to the structural steel. The investigations aim was to determine the role of microstructure in a tribological properties between the structural steel and tool material. The results of such investigation could be referenced to the industry conditions and could answer about the problems of tool materials wear. The observations of the wear mechanisms were referred to the microstructure of the mill rolls. The laboratory tests ware aimed at evaluating the thermal treatment modification effect on the cast steels properties. A significant role of the morphology of ledeburitic cementite and secondary cementite on the tribological properties was exhibited. The investigations assumed the presence of an austenitic matrix with primary and secondary cementite. Influence of varying morphology carbides was described. in the cast steel microstructure. The investigation results make possible to point to a direction of carbide morphology change with the purpose of obtaining the assumed properties of hot operation tools.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 2; 915-920
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:
Własności tribologiczne stopów z układu Ni-Ta-Al-M o dużej zawartości węgla
The tribological properties of the alloy from Ni-Ta-Al-M system with high carbon content
Autorzy:
Bała, P.
Krawczyk, J.
Madej, M.
Powiązania:
https://bibliotekanauki.pl/articles/189139.pdf
Data publikacji:
2012
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
zużycie
tribologia
stop Ni
węgliki
materiał narzędziowy
wear
tribology
Ni-based alloys
carbides
tool material
Opis:
W niniejszej pracy przedstawiono ocenę własności tribologicznych stopów z układu Ni-Ta-Al-M o dużej zawartości węgla. Materiały te zaprojektowano do pracy w wysokich temperaturach w warunkach silnego zużycia tribologicznego oraz agresywnego chemicznie środowiska. Omówiono mikrostrukturę badanych stopów po odlaniu i po obróbce cieplnej oraz określono rodzaj i udział objętościowy węglików. Badania tribologiczne wykonano w temperaturze pokojowej, w stanie po odlaniu oraz po obróbce cieplnej celem określenia roli węglików w mechanizmie zużycia. Określono wpływ obciążenia i czasu trwania próby na parametry tribologiczne ww. stopów. Dla wszystkich wariantów testów tribologicznych wyznaczono wielkość zużycia, współczynnik tarcia oraz określono mechanizm zużycia.
In the paper, the two alloys from Ni-Ta-Al-M system with high carbon content, strengthened by intermetallic compounds, are presented. The chemical compositions of the new materials were designed in such a way as to obtain matrix strengthening by means of the precipitation of intermetallic compounds rich in Ni as well as Al and Ta and having the carbide fraction above 20%. Carbides should remain stable in the microstructure, regardless of the heat treatment, since they favourably influence an abrasion resistance. Tools use for special application made of these materials should primarily have good tribological properties at elevated temperatures. The microstructures and carbides volume fraction of investigated alloys are described. The tribological tests were performed at ambient temperature to determined the role of the carbides in the wear mechanism. The wear level, coefficient of wear, and wear mechanism for all investigated alloys, are described.
Źródło:
Tribologia; 2012, 3; 21-28
0208-7774
Pojawia się w:
Tribologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the Forming Process of Energy-Absorbing Elements made from 7000 Series High-Strength Aluminum Alloy
Autorzy:
Jaśkiewicz, K.
Skwarski, M.
Polak, S.
Gronostajski, Z.
Krawczyk, J.
Kaczyński, P.
Chorzępa, W.
Powiązania:
https://bibliotekanauki.pl/articles/355556.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
aluminum alloys
hot forming
Opis:
The paper covers the research on the process of solutionizing of 7075 aluminum alloy in cold tools during the stamping of a high-strength structural element (B-pillar’s base). For technological reasons, in order to obtain high strength parameters of the 7075 alloy, it is necessary to carry out a solutionization process, which allows to obtain dispersion strengthening during ageing process. Properly performed heat treatment of the alloy increases the strength of the material to approx. 600 MPa. The combination of the process of solutionization with simultaneous shaping is aimed at improving and simplifying technological operations of aluminum alloy stamping, shortening the duration of the manufacturing process and reducing production costs. The manufactured lower part of the B-pillar will be used for the verification of the validity of the developed method. During the experiment, a series of stamping tests were carried out, in which the lubricants, pressure and position of the upper and lower blankholders were the variables. The obtained results allow to estimate the influence of the cooling conditions on the strength of the drawpieces obtained after the process of artificial ageing. In order to verify and analyse the results more quickly, a numerical simulation was carried out.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 2; 697-705
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of CMSX-4 single-crystalline turbine blades root by electron and X-ray diffraction methods
Autorzy:
Krawczyk, J.
Zubko, M.
Bogdanowicz, W.
Tondos, A.
Sieniawski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1058074.pdf
Data publikacji:
2016-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.10.Aj
61.72.Ff
61.05.J-
Opis:
The root of single-crystalline turbine blade made of CMSX-4 superalloy were studied. The studied blade was produced by the Bridgman technique in industrial ALD furnace at withdrawal rate of 3 mm/min. The samples for investigations were cut from the blade root parallel to the withdrawal direction. Metallographic sections of longitudinal samples planes were prepared for further investigations. The samples were analysed using scanning electron microscopy and the Laue diffraction studies. The crystal orientations in macro-scale were determined by analysis of the Laue pattern and local crystal orientations were studied by electron backscattered diffraction technique. Morphology of dendrites were examined by analysis of scanning electron microscopy macro-images. Study of subgrain structure was performed by X-ray diffraction topography. The sharp parallel contrast bands, visible on the X-ray topograms, were related with dendrite cores, arranged with the same direction. Additionally, the low angle boundaries were formed in certain samples, visible on the topograms as contrast shifts. Step changes of local crystal orientation in certain areas were observed on the electron backscattered diffraction maps. The electron backscattered diffraction crystal orientation maps were related to the misorientation visualized in topograms.
Źródło:
Acta Physica Polonica A; 2016, 130, 4; 1104-1106
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rola modyfikacji we właściwościach tribologicznych staliwa ledeburytycznego
The role of modification processes in ledeburitic class cast steel tribological properties
Autorzy:
Krawczyk, J.
Rożniata, E.
Dąbrowski, R.
Madej, M.
Pacyna, J.
Powiązania:
https://bibliotekanauki.pl/articles/391514.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
Tematy:
staliwo
modyfikacja
tribologia
zużycie
cast steel
modification
tribology
wear
Opis:
Praca dotyczy badań tribologicznych staliwa G200CrNiMo4-3-3 w stanie bez modyfikacji oraz po modyfikacji FeSi oraz FeB. Modyfikacja FeSi ograniczyła, a modyfikacja FeB wyeliminowała wydzielenia cementytu drugorzędowego w układzie Widmanstättena. Uzyskany w wyniku modyfikacji wzrost twardości oraz zmniejszenie udziału wydzieleń cementytu w układzie Widmanstättena nie skutkował wzrostem odporności na ścieranie. Modyfikacja FeSi spowodowała wzrost średniego współczynnika tarcia. Uzyskane wyniki badań wskazują, że sam proces modyfikacji (ograniczający ilość wydzieleń cementytu drugorzędowego) nie jest wystarczający dla poprawy właściwości tribologicznych. Niezbędnym wydaje się zastosowanie (obok modyfikacji) również obróbki cieplnej, skutkującej wydzieleniem cementytu drugorzędowego w obszarze pierwotnego ziarna austenitu.
The work focuses on tribological tests of G200CrNiMo4-3-3 cast steel in the state without modification as well as after modification with FeSi and FeB. The FeSi modification reduced the secondary cementite precipitation in the Widmanstätten pattern and the FeB modification eliminated it. The increase in hardness and the reduction of the cementite content in the Widmanstätten pattern obtained as a result of the modification did not increase abrasion resistance. The FeSi modification resulted in an increase of the mean friction coefficient. The obtained test results point to the fact that the modification process itself (limiting the amount of the secondary cementite precipitations) is not sufficient to improve tribological properties. It seems necessary to apply (beside modification) also heat treatment resulting in secondary cementite precipitation in the area of primary austenite grain.
Źródło:
Prace Instytutu Odlewnictwa; 2015, T. 55, nr 3, 3; 71-79
1899-2439
Pojawia się w:
Prace Instytutu Odlewnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 30

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