Modelling of dendritic growth under forced convection in solidification of Al-7Si alloy

被引：5
作者：
Liu, D. -R. [1 ]
Guo, E. J. [1 ]
Wang, L. P. [1 ]
Kang, F. W. [1 ]
Lan, Q. [2 ]
机构：
[1] Harbin Univ Sci & Technol, Sch Mat Sci & Engn, Harbin 150040, Peoples R China
[2] Guangxi Univ Natl, Sch Phys & Elect Engn, Nanning 530006, Peoples R China
来源：
INTERNATIONAL JOURNAL OF CAST METALS RESEARCH | 2007年 / 20卷 / 05期
关键词：
dendritic growth; forced convection; computer simulation; semisolid metal processing;
D O I：
10.1179/136404607X268085
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
An integrated microscale model is used to describe the dendritic growth morphology of Al-7Si alloy under forced convection, which combines the two-dimensional finite difference method (FDM) with the cellular automaton (CA) model. The FDM is used to simulate the induced fluid flow and solute transfer. The CA model is used to depict the dendritic morphology. Simulations are performed to investigate the influences of processing variables on morphological evolution under stirring. Calculated results reveal that at the intermediate undercooling, the growth morphology changes from dendritic to rosette as the rotation speed increases. The dendritic growth is promoted by increasing the undercooling. The rotation speed has a minor influence on microstructure formation for the cases of lower and higher undercoolings. A globulitic structure is formed as the nucleation density is increased. Changing the rotation speed is found to have a negligible influence on morphological evolution for the grain refined alloy.
引用
收藏
页码：254 / 264
页数：11
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