Al-Si合金凝固组织的三维模拟及预测  

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

作　　者：张华[1] 倪红卫[1] 陈光友[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：《过程工程学报》2009年第S1期92-96,共5页The Chinese Journal of Process Engineering

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

摘　　要：用有限元商业软件PROCAST中的CA-Fé模型,对不同工艺条件下Al-Si合金A104的凝固组织进行了三维模拟及预测,并进行了热态验证实验.研究结果表明,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;当浇注温度从903K增大到993K,铸件凝固组织中柱状晶比例由22%增大到45%,且晶粒组织明显变得粗大;当冷却强度从500W/(m2·K)增大到4000W/(m2·K),铸件凝固组织中柱状晶比例明显增大,由14%增大到38%.A 3-D cellular automaton (CA)-finite element (FE) model within PROCAST package was used to predict the solidification structure of Al-Si alloy at different casting conditions. The simulated results were validated with hot test. The results showed that the simulated results were in accord with the experimental results well,and could accurately reflect the distribution,proportion,size of equiaxed and columnar grains. When the casting temperature changed from 903 to 993 K,the proportion of columnar grains gradually changed from 22% to 45%,and the grains became coarse. With increasing of heat transfer coefficient from 500 to 4000 W/(m2·K),the proportion of columnar grains gradually increased from 14% to 38%.

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：TG146.21[一般工业技术—材料科学与工程]