溶质偏析对铸造铝合金疏松缩孔缺陷的影响  

Influence of Solute Segregation on Shrinkage and Porosity Prediction of Aluminium Alloy Casting

作　　者：左强[1] 洪润洲[1] 周永江[1] 杨守杰[1] 

机构地区：[1]中国航发北京航空材料研究院北京市先进铝合金材料及应用工程技术研究中心,北京100095

出　　处：《铸造》2017年第4期381-385,共5页Foundry

摘　　要：研究了溶质偏析行为对铝合金凝固过程中缩孔疏松缺陷的影响。分析不同偏析模型(杠杆定律、Scheil模型、逆扩散模型)下合金的溶质再分配与热物性参数;采用Pro CAST有限元模拟软件包的Niyama判据预测不同偏析模型下凝固缩孔疏松缺陷的形成趋势,并结合试验结果给出溶质偏析对凝固缺陷的影响。The influence of solute segregation on the shrinkage and porosity prediction of aluminium alloy casting is studied. Based on three segregation models （Lever rule, Scheil model and Back diffusion model）, the solute redistribution and corresponding thermophysical parameters were analyzed. Then, the shrinkage and porosity were predicted by the finite element casting simulation software ProCAST with Niyama criterion. The prediction results were tested by experiment. The influence of solute segregation on the shrinkage and porosity was obtained in combination with the theoretical prediction and experiment.

关 键 词：偏析 凝固 铝合金 缩孔疏松 

分 类 号：TG292[金属学及工艺—铸造]