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    Wyświetlanie 1-4 z 4
    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:
    Hot Formability of Heat-Resistant Stainless Steel X15CrNiSi20-12
    Autorzy:
    Kawulok, R.
    Schindler, I.
    Navrátil, H.
    Ševčák, V.
    Sojka, J.
    Konečná, K.
    Chmiel, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/355196.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heat-resistant stainless steel
    hot tension test
    nil strength temperature
    nil ductility temperature
    Opis:
    High-temperature plastic properties of heat-resistant stainless steel X15CrNiSi20-12 were assessed on the basis of hot tensile tests and nil strength tests. The results were supported by metallographic analyses using SEM and EDX analysis. The formability of the investigated steel can be divided into roughly three temperature areas. In the temperature range of 900°C to about 1050°C, formability was negatively affected by precipitation of carbide particles at grain boundaries. As the temperature rose to 1200°C, these particles dissolved, resulting in an increase in formability. Further temperature increases resulted in a relatively steep drop in formability caused by overheating of the material. The nil ductility temperature of 1280°C and the nil-strength temperature of 1362°C were determined. The Plastic and strength properties of the investigated material were compared with the deformation behavior of the reference steel X5CrNi18-10, which shows a significantly wider range of suitable forming temperatures.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 2; 727-734
    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:
    Study of Hot Deformation Behavior of CuFe2 Alloy
    Autorzy:
    Schindler, I.
    Sauer, M.
    Kawulok, P.
    Rodak, K.
    Hadasik, E.
    Jabłońska, M. Barbara
    Rusz, S.
    Ševčák, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/353206.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    copper alloy CuFe2
    hot ductility
    stress-strain curves
    hot deformation activation energy
    Opis:
    Nil strength temperature of 1062°C and nil ductility temperature of 1040°C were experimentally set for CuFe2 alloy. The highest formability at approx. 1020°C is unusable due to massive grain coarsening. The local minimum of ductility around the temperature 910°C is probably due to minor formation of γ-iron. In the forming temperatures interval 650-950°C and strain rate 0.1-10 s-1 the flow stress curves were obtained and after their analysis hot deformation activation energy of 380 kJ·mol-1 was achieved. Peak stress and corresponding peak strain values were mathematically described with good accuracy by equations depending on Zener-Hollomon parameter.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 2; 701-706
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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