Transformation character of ferrite formation by a ledge mechanism under a mixed-control model

Zhen-qing Liu, Zhi-gang Yang, Zhao-dong Li, Chi Zhang

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    Zhen-qing Liu, Zhi-gang Yang, Zhao-dong Li, and Chi Zhang, Transformation character of ferrite formation by a ledge mechanism under a mixed-control model, Int. J. Miner. Metall. Mater., 19(2012), No. 5, pp.428-433. https://dx.doi.org/10.1007/s12613-012-0574-6
    Zhen-qing Liu, Zhi-gang Yang, Zhao-dong Li, and Chi Zhang, Transformation character of ferrite formation by a ledge mechanism under a mixed-control model, Int. J. Miner. Metall. Mater., 19(2012), No. 5, pp.428-433. https://dx.doi.org/10.1007/s12613-012-0574-6
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    Transformation character of ferrite formation by a ledge mechanism under a mixed-control model

    • Key Laboratory of Advanced Materials, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

    基金项目: 

    This work was financially supported by the National Natural Science Foundation of China (Nos.51171087 and 51071089) and the Specialized Research Fund for the Doctoral Program of Higher Education (No.20070003006).

      通信作者:

      Zhi-gang Yang E-mail: zgyang@tsinghua.edu.cn

    中文摘要

    A mixed-control model was developed to study the transformation character of ferrite formation by a ledge mechanism. A numerical two-dimensional diffusion-field model was combined to describe the evolution of the diffusion field ahead of the migrating austenite/ferrite interface. The calculation results show that the bulk diffusion-controlled model leads to a deviation from experimental results under large solute supersaturation. In the mixed-control model, solute supersaturation and a parameter Z together determine the transformation character, which is quantified by the normalized concentration of carbon in austenite at the austenite/ferrite interface. By comparing with experimental data, the pre-exponential factor of interface mobility, M0, is estimated within the range from 0.10 to 0.60 mol·m·J-1·s-1 for the alloys with 0.11wt%-0.49wt% C at 700-740℃. For a certain Fe-C alloy, the trend of the transformation character relies on the magnitude of M 0 as the transformation temperature decreases.

     

    Transformation character of ferrite formation by a ledge mechanism under a mixed-control model

    Author Affilications

      • Key Laboratory of Advanced Materials, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

    • Funds: 

      This work was financially supported by the National Natural Science Foundation of China (Nos.51171087 and 51071089) and the Specialized Research Fund for the Doctoral Program of Higher Education (No.20070003006).

    • Received: 20 June 2011; Revised: 07 August 2011; Accepted: 21 August 2011;
    A mixed-control model was developed to study the transformation character of ferrite formation by a ledge mechanism. A numerical two-dimensional diffusion-field model was combined to describe the evolution of the diffusion field ahead of the migrating austenite/ferrite interface. The calculation results show that the bulk diffusion-controlled model leads to a deviation from experimental results under large solute supersaturation. In the mixed-control model, solute supersaturation and a parameter Z together determine the transformation character, which is quantified by the normalized concentration of carbon in austenite at the austenite/ferrite interface. By comparing with experimental data, the pre-exponential factor of interface mobility, M0, is estimated within the range from 0.10 to 0.60 mol·m·J-1·s-1 for the alloys with 0.11wt%-0.49wt% C at 700-740℃. For a certain Fe-C alloy, the trend of the transformation character relies on the magnitude of M 0 as the transformation temperature decreases.

     

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