Al-Si合金凝固组织的数值模拟及预测  

Numerical Simulation and Prediction of Solidification Structure of Al-Si Alloy

作　　者：陈光友[1] 倪红卫[1] 张华[1] 詹玮婷[1] 成日金[1] 刘吉刚[1] 

机构地区：[1]武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室,湖北武汉430081

出　　处：《铸造技术》2009年第1期48-52,共5页Foundry Technology

基　　金：教育部博士点基金(20050488001);湖北省教育厅科研基金资助项目(2004Z001)

摘　　要：建立有限元(Finite Element)和元胞自动机法(Cellular Automaton)相结合的宏微观耦合的CA-FE模型,模拟不同工艺条件下Al-Si合金的凝固组织,进行了热态验证实验。结果表明,模拟结果与实验结果基本吻合,能够较为准确地反映出等轴晶和柱状晶的分布位置、比例和大小;随着浇注温度的提高,铸件凝固组织中柱状晶比例逐渐增大,且晶粒明显变得粗大;铸锭的凝固组织主要受铸模本身冷却能力的控制,而受外界的冷却强度影响不大,随着铸模厚度的增大,凝固组织中柱状晶比例逐渐增大。Through coupling of finite element and cellular automaton method, a CA-FE model was established to simulate the solidification structures of Al-Si alloy at different casting conditions, and the simulated results was validated with hot test. The results show that the simulated results are in good accordance with the experimental results, and it can accurately predict the distribution, proportion, size of equiaxed grain and columnar grain. With increasing the casting temperature, the fraction of columnar grain in solidification structure increases, and the grains become coarse significantly. The solidification structure of casting ingot is mainly controlled by the cooling ability of the mold itself, and the ambient cooling has a slight effect on solidification structure. With increasing the thickness of mold, the fraction of columnar grain increase gradually.

关 键 词：AL-SI合金 有限元 元胞自动机法 数值模拟 凝固组织 

分 类 号：TG27[金属学及工艺—铸造]