Austenite Grain Growth in Peritectic Solidified Carbon Steels Analyzed by Phase-Field Simulation
Austenite Grain Growth in Peritectic Solidified Carbon Steels Analyzed by Phase-Field Simulation
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DOI：
10.1007/s11661-011-1072-6
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发表时间：
2012-02
期刊：
影响因子：
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通讯作者：
M. Ohno;S. Tsuchiya;K. Matsuura
中科院分区：
文献类型：
--
作者：
M. Ohno;S. Tsuchiya;K. Matsuura
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.
