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Austenite Grain Growth in Peritectic Solidified Carbon Steels Analyzed by Phase-Field Simulation

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Abstract

The formation of coarse columnar grains (CCGs) in the as-cast austenite structure of peritectic carbon steels is a serious problem in continuous casting processes. Recently, it was elucidated that the formation of CCGs is ascribed to a discontinuous grain growth. Furthermore, the critical condition for the discontinuous growth to occur was elicited on the basis of phase-field simulations and a theory of grain growth. In this study, by means of the phase-field simulations, the detailed investigation is carried out for the grain coarsening of the as-cast austenite structure. It is demonstrated in the two-dimensional simulations that the coarsest grain structure emerges by the discontinuous growth in the vicinity of the critical condition. In addition, a model for predicting the upper limit of grain size during the discontinuous growth is proposed. The model successfully describes the experimental result with reasonable accuracy.

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Acknowledgments

This work was supported by 18th ISIJ Research Promotion Grant and Grant-in-Aid for Young Scientists (A) (No. 2268067) from MEXT, Japan. One author (M.O.) acknowledges partial financial support from the Next Generation Super Computing Project, Nano-science Program, MEXT, Japan.

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Authors and Affiliations

  1. Division of Materials Science and Engineering, Faculty of Engineering, Hokkaido University, Sapporo, Hokkaido, 060-8628, Japan

    Munekazu Ohno (Associate Professor), Shingo Tsuchiya (Graduate Student) & Kiyotaka Matsuura (Professor)

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  1. Munekazu Ohno
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  2. Shingo Tsuchiya
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  3. Kiyotaka Matsuura
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Corresponding author

Correspondence to Munekazu Ohno.

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Manuscript submitted August 5, 2011.

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Ohno, M., Tsuchiya, S. & Matsuura, K. Austenite Grain Growth in Peritectic Solidified Carbon Steels Analyzed by Phase-Field Simulation. Metall Mater Trans A 43, 2031–2042 (2012). https://doi.org/10.1007/s11661-011-1072-6

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