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    Wyświetlanie 1-3 z 3
    Tytuł:
    Dilatometric Study of High Strength Steels Hardenability
    Autorzy:
    Di Schino, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/351965.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high strength steel
    quenching
    hardenability
    microstructure
    Opis:
    The effect of low-alloy additions on low-C steels hardenability is reported. Various as-quenched materials with microstructures consisting of low-C (granular) bainitic (B), mixed bainitic (B)/martensitic (M) and fully martensitic microstructures were produced. Results show that for a given cooling rate, an increase of austenite grain size (AGS) and of Mo and Cr contents decreases the transformation temperatures and promotes martensite formation.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 1; 457-460
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling Grain Growth Kinetics in Steels
    Autorzy:
    Napoli, G.
    Di Schino, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/351246.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    grain growth
    steel
    computer simulation
    kinetics
    Opis:
    Steel is a versatile material that has found widespread use because of its mechanical properties, its relatively low cost, and the ease with which it can be used in manufacturing process such as forming, welding and machining. Regarding to mechanical properties are strongly affected by grain size and chemical composition variations. Many industrial developments have been carried out both from the point of view of composition variation and grain size in order to exploit the effect of these variables to improve the mechanical proprieties of steels. It is also evident that grain growth are relevant to the mechanical properties of steels, thus suggesting the necessity of mathematical models able to predict the microstructural evolution after thermo cycles. It is therefore of primary importance to study microstructural changes, such as grain size variations of steels during isothermal treatments through the application of a mathematical model, able in general to describe the grain growth in metals. This paper deals with the grain growth modelling of steels based on the statistical theory of grain growth originally developed by Lücke [1] and here integrated to take into account the Zener drag effect and is therefore focused on the process description for the determination of the kinetics of grain growth curves temperature dependence.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 2; 839-844
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tool Steels: Forging Simulation and Microstructure Evolution of Large Scale Ingot
    Autorzy:
    Mengaroni, S.
    Cianetti, F.
    Calderini, M.
    Evangelista, E.
    Di Schino, A.
    McQueen, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402102.pdf
    Data publikacji:
    2015-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    06.60.Ei
    61.05.J-
    81.05.Bx
    Opis:
    The aim of this paper is to analyze the hot working behavior of two different steels based on 3% and 5% Cr steel chemistry, respectively. Hot deformation is studied by hot torsion tests in the range of temperatures 1000-1200°C and strain rates 0.01, 0.10, 1.00 $s^{-1}$. At given temperatures and strain rates flow curves exhibit a peak followed by a decline towards a steady state which is indicative of dynamic recrystallization. At constant strain, flow stress increases with increasing strain rate and decreasing temperature. The analysis of the constitutive equation relating peak flow stress, strain rate and temperature shows high activation energy values for both steels. Recrystallized volume fraction of steels after hot deformation is estimated based on the grain orientation spread as measured by electron backscattered diffraction technique, on the hot deformed and quenched materials.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 4; 629-632
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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