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    Wyświetlanie 1-4 z 4
    Tytuł:
    Transformation Diagrams of Selected Steel Grades with Consideration of Deformation Effect
    Autorzy:
    Kawulok, R.
    Schindler, I.
    Mizera, J.
    Kawulok, P.
    Rusz, S.
    Opěla, P.
    Podolínský, P.
    Čmiel, K. M.
    Mališ, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/351710.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    transformation diagrams of steels
    phase transformation
    plastic deformation
    dilatometric tests
    Gleeble 3800
    Opis:
    The aim of this article was to assess the effect of previous plastic deformation on the transformation kinetics of selected steels with a wide range of chemical composition. Transformation (CCT and DCCT) diagrams were constructed on the basis of dilatometric tests on the plastometer Gleeble 3800 and metallographic analyses supplemented by measurements of HV hardness. Effect of previous deformation on transformation was evaluated of the critical rate of formation of the individual structural components (ferrite, pearlite and bainite) in the case of formation of martensite respect to Ms temperature. Previous plastic deformation accelerated especially diffuse transformations (ferrite and pearlite), temperature of Ms was lower after previous plastic deformation and bainitic transformation was highly dependent on the chemical composition of steel.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 1; 55-60
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of the Effect of Deformation on Transformation Diagrams of Two Low-Alloy Manganese-Chromium Steels
    Autorzy:
    Kawulok, R.
    Kawulok, P.
    Schindler, I.
    Opěla, P.
    Rusz, S.
    Ševčák, V.
    Solowski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/355693.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    CCT diagrams
    DCCT diagram
    16MnCrS5 steels
    20MnCrS5 steels
    dilatometric tests
    microstructure
    Opis:
    The work deal with an assembling and comparing of transformation diagrams of two low-alloy steels, specifically 16MnCrS5 and 20MnCrS5. In this work, diagrams of the type of CCT and DCCT of both steels were assembled. Transformation diagrams were assembled on the basis of dilatometric tests realized on the plastometer Gleeble 3800, of metallographic analyses and of hardness measurements. In addition, for comparison, the transformation diagrams were assembled even with use of the QTSteel 3.2 software. Uniform austenitization temperature of 850°C was chosen in case of both steels and even both types of diagrams. In case of both steels, an influence of deformation led to expected acceleration of phase transformations controlled by diffusion and also of bainite transformation. In both cases, the kinetics of martensitic transformation was not significantly affected by deformation.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 4; 1735-1741
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Deformation and Austenitization Temperature on the Kinetics of Phase Transformations During Cooling of High-Carbon Steel
    Autorzy:
    Kawulok, P.
    Podolinský, P.
    Kajzar, P.
    Schindler, I.
    Kawulok, R.
    Ševčák, V.
    Opěla, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/350975.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high-carbon steel
    cooling
    transformation diagrams
    microstructure
    hardness
    Opis:
    The aim of the performed experiments was to determine the influence of deformation and of austenitization temperature on the kinetics of phase transformations during cooling of high-carbon steel (0.728 wt. % C). The CCT and DCCT diagrams for austenitization temperature 940°C and DCCT diagram for austenitization temperature 1000°C were constructed with the use of dilatometric tests. On the basis of obtained results, a featureless effect of austenitization temperature and deformation on the kinetics of phase transformations during cooling of investigated steel was observed. Critical cooling rates for the transformation of martensite in microstructure fluctuated from 5 to 7°C · s-1 (depending on the parameters of austenitization and deformation), but only at cooling rates higher than 8°C · s-1 a dominant share of martensite was observed in the investigated steel, which resulted in the significant increase of hardness.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 4; 1743-1748
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of a Cooling Rate on the Evolution of Microstructure and Hardness of the Steel 27MnCrB5
    Autorzy:
    Kawulok, P.
    Schindler, I.
    Mizera, J.
    Kawulok, R.
    Rusz, S.
    Opěla, P.
    Olszar, M.
    Čmiel, K. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/351298.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    steel 27MnCrB5
    continuous cooling transformation diagrams
    dilatometric tests
    plastometer Gleeble 3800
    software QTSteel
    Opis:
    The aim of the performed experiments was to determine the influence of a cooling rate on the evolution of microstructure and hardness of the steel 27MnCrB5. By using dilatometric tests performed on the plastometer Gleeble 3800 and by using mathematical modelling in the software QTSteel a continuous cooling transformation diagram for a heating temperature of 850°C was constructed. Conformity of diagrams constructed for both methods is relatively good, except for the position and shape of the ferrite nose. The values of hardness, temperatures of phase transformations and the volume fractions of structural phases upon cooling from the temperature of 850°C at the rate from 0.16°C · s-1 to 37.2°C · s-1 were determined. Mathematically predicted proportion of martensite with real data was of relatively solid conformity, but the hardness values evaluated by mathematical modelling was always higher.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 2; 907-914
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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