真空自耗电弧熔炼TC4铸锭的凝固组织和缩松缩孔的模拟  

Simulation on Solidification Structure and Shrinkage Porosity(Hole)in TC4 Ingot during Vacuum Arc Remelting Process

作　　者：张颖娟[1] 寇宏超[1] 李鹏飞[1] 钟宏[1] 胡锐[1] 李金山[1] 周廉[1] 

机构地区：[1]西北工业大学凝固技术国家重点实验室

出　　处：《特种铸造及有色合金》2012年第5期418-421,共4页Special Casting & Nonferrous Alloys

基　　金：国家重点基础研究发展计划(973计划)资助项目(2007CB613802);高等学校学科创新引智计划资助项目(B08040)

摘　　要：建立三维轴对称有限元模型,采用移动边界法模拟了真空自耗电弧熔炼(VAR)TC4合金铸锭凝固过程的温度场分布,并基于元胞自动机和有限元耦合法(CAFE法)计算了VAR过程中TC4铸锭的凝固组织、缩松和缩孔的形成。结果表明,模拟结果与试验观察在晶粒结构、柱状晶生长方向,柱状晶-等轴晶转变及缩松和缩孔等方面相符合。Through establishing a three-dimensional axisymmetric finite-element model,the temperature distribution of TC4 alloy ingot during VAR（vacuum arc remelting） process was simulated by moving boundary heat transfer method.The solidification structure and shrinkage porosity（hole） formation in the TC4 alloy ingot during VAR process were visualized by the coupled method of cellular automaton（CA） and finite element（FE） method.The simulated results are well in agreement with experimental ones in grain structure,growth direction of columnar crystal,transformation of columnar grain into equiaxed grain as well as shrinkage porosity（hole）.

关 键 词：VAR CAFE模型 凝固组织 缩松缩孔 钛合金 

分 类 号：TF823[冶金工程—有色金属冶金]