A modified cellular automaton model for the simulation of dendritic growth in solidification of alloys

被引:196
作者
Zhu, MF [1 ]
Hong, CP [1 ]
机构
[1] Yonsei Univ, Ctr Comp Aided Mat Proc, Dept Engn Met, Seodaemun Ku, Seoul 120749, South Korea
关键词
solidification; microstructural evolution; modified cellular automaton; finite volume method; nucleation; growth kinetics; solute redistribution; diffusion; curvature; columnar dendritic structure; equiaxed dendritic structure; columnar-equiaxed transition;
D O I
10.2355/isijinternational.41.436
中图分类号
TF [冶金工业];
学科分类号
0806 ;
摘要
A modified cellular automaton model (MCA) was developed in order to simulate the evolution of dendritic microstructures in solidification of alloys. Different from the classical cellular automata in which only the temperature field was calculated, this model also included the solute redistribution both in liquid and solid during solidification. The finite volume method, which was coupled with the cellular automaton model, was used to calculate the temperature and solute fields in the domain. The relationship between the growth velocity of a dendrite tip and the local undercooling was calculated according to the KGT (Kurz-Giovanola-Trivedi) model. The effects of constitutional undercooling and curvature undercooling on the equilibrium interface temperature were also considered in the present model. The MCA model was applied to predict the dendritic microstructures, such as the free dendritic growth from an undercooled melt and competitive dendritic growth in practical casting solidification. The simulated results were compared with those obtained experimentally.
引用
收藏
页码:436 / 445
页数:10
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