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    Volume 8, Issue 2 (February 2019)

    Special Issue Paper

    A Novel Approach for Analytical Description of the Isothermal Bainite Transformation in Alloyed Steels

    (Received 16 December 2017; accepted 5 April 2018)

    Published Online: 2018

    CODEN: MPCACD

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    Abstract

    A novel approach for modeling the bainite transformation in alloyed steels during isothermal quenching is presented. The approach is based on the application of the logistic function with the logarithmic argument of the isothermal holding time. The proposed model involves two time-independent fitting parameters, a and b, where are specified for the given isothermal quenching temperature and other conditions (e.g., steel grade, austenite grain size, etc.). The adequacy of the modeling results is estimated using the sum of squared differences between the experimental and calculated bainite fraction formed at every time step Δτ during isothermal quenching. The logistic function was found to provide a fit between the experimental and calculated bainite transformation kinetics that was up to ten times better than that of the conventionally applied Kolmogorov–Johnson–Mehl–Avrami equation. An excellent agreement is achieved between the modeling results and the experimental data for commercially produced high-strength alloyed steels 300M, HY-TUF, and D6AC isothermally quenched in the temperature range of the bainite transformation. The obtained temperature dependences of the model parameters a and b reveal the potential for further theoretical investigation and verification of their physical meaning.

    Author Information:

    Maisuradze, M. V.
    Department of Heat Treatment and Physics of Metals, Ural Federal University, Yekaterinburg,

    Yudin, Y. V.
    Department of Heat Treatment and Physics of Metals, Ural Federal University, Yekaterinburg,

    Kuklina, A. A.
    Department of Heat Treatment and Physics of Metals, Ural Federal University, Yekaterinburg,


    Stock #: MPC20170168

    ISSN:2379-1365

    DOI: 10.1520/MPC20170168

    Author
    Title A Novel Approach for Analytical Description of the Isothermal Bainite Transformation in Alloyed Steels
    Symposium ,
    Committee A01