摘要
采用有限元商业软件PROCAST中的CA-F-模型,模拟了DZ417G高温合金定向凝固过程,用正交法研究了选晶器几何尺寸对凝固组织的影响.研究结果表明,螺旋选晶器在选晶生长机制中能迅速减少晶粒数量,同时晶粒数量的控制还受选晶器和叶片连接部分影响;螺旋在晶粒取向优化的选择上没有绝对优化;经过晶粒数量和取向偏差两指标的显著性分析、直观分析和验证计算后,得出θ=60°,dr=5 mm,ds=14 mm,n=1这对组合为最优方案,该组合经过选晶器后得到单晶并且单晶取向控制在15°以内.
Cellular Automaton Finite Element model （CAFE） in finite element software of PROCAST is used to study the effect of spiral grain selector geometry on mlerostructure evolution by orthogonal method during directional solidification of DZ417G superaUoy. This study showed that grain number is rapidly decreased in crystal growth mechanism by grain selector, and is also controled by the connection parts of grain selector and blade at the same time. Gain orientation has no absolute optimization in grain selector. It is found that the group of θ = 60°,dr = 5 mm,d5 = 14 mm,n = 1 is the optimum scheme by significant analysis, intuitive analysis and verified calculation with two indexes on grain number and orientation deviation. This group can obtain single crystal after grain selection, and the orientation deviation can be controled in less than 15°.
出处
《内蒙古科技大学学报》
CAS
2012年第1期27-33,共7页
Journal of Inner Mongolia University of Science and Technology
基金
上海科技重大项目(08BZ1130100)
上海大学研究生创新基金资助项目(SHUCX112239)
关键词
定向凝固
微观组织
取向偏差
晶粒数量
directional solidification
microstructure
average orientation
grain number
