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Analysis of the γ → α transformation in a C-Mn steel by phase-field modeling

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Abstract

This article deals with the austenite (γ) decomposition to ferrite (α) during cooling of a 0.10 wt pct C-0.49 wt pct Mn steel. A phase-field model is used to simulate this transformation. The model provides qualitative information on the microstructure that develops on cooling and quantitative data on both the ferrite fraction formed and the carbon concentration profile in the remaining austenite. The initial austenitic microstructure and the ferrite nucleation data, derived by metallographic examination and dilatometry, are set as input data of the model. The interface mobility is used as a fitting parameter to optimize the agreement between the simulated and experimental ferrite-fraction curve derived by dilatometry. A good agreement between the simulated α-γ microstructure and the actual α-pearlite microstructure observed after cooling is obtained. The derived carbon distribution in austenite during transformation provides comprehension of the nature of the transformation with respect to the interface-controlled or diffusion-controlled mode. It is found that, at the initial stage, the transformation is predominantly interface-controlled, but, gradually, a shift toward diffusion control takes place to a degree that depends on cooling rate.

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Authors and Affiliations

  1. the Netherlands Institute for Metals Research, Rotterdamseweg 137, 2628 AL, Delft, The Netherlands

    M. G. Mecozzi

  2. the Department of Materials Science and Engineering, Delft University of Technology, Rotterdamseweg 137, 2628 AL, Delft, The Netherlands

    M. G. Mecozzi & J. Sietsma Ph.D.

  3. the Faculty of Aerospace Engineering, Delft University of Technology, Kluyverweg 1, 2629 HS, Delft, The Netherlands

    S. van der Zwaag (Professor)

  4. Access eV, Intzestasse 5, D-52072, Aachen, Germany

    M. Apel Ph.D., P. Schaffnit Ph.D. & I. Steinbach Ph.D.

Authors
  1. M. G. Mecozzi
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  2. J. Sietsma Ph.D.
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  3. S. van der Zwaag
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  4. M. Apel Ph.D.
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  5. P. Schaffnit Ph.D.
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  6. I. Steinbach Ph.D.
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Mecozzi, M.G., Sietsma, J., van der Zwaag, S. et al. Analysis of the γ → α transformation in a C-Mn steel by phase-field modeling. Metall Mater Trans A 36, 2327–2340 (2005). https://doi.org/10.1007/s11661-005-0105-4

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  • DOI: https://doi.org/10.1007/s11661-005-0105-4

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