浇注温度对A356合金半固态枝晶衍变规律的影响  

Microstructural Evolution of A356 Produced by Controlled Pouring in Semisolid State

作　　者：宁志良 H.Wang David H.StJohn 刘殿魁[1] 

机构地区：[1]哈尔滨工程大学航天学院 [2]昆士兰大学冶金矿业材料系

出　　处：《哈尔滨理工大学学报》2005年第4期26-28,32,共4页Journal of Harbin University of Science and Technology

基　　金：黑龙江省教育厅海外学人科研资助项目(1054HQ009);哈尔滨市留学归国人员基金(2003AFLXJ001)

摘　　要：研究了控制浇注法制备A356合金半固态枝晶衍变规律,结果表明:原始显微结构对枝晶半固态衍变具有较大影响,对于原始组织粗大的树枝晶合金,即使经过长时间的保温,初生α相仍为枝晶网状结构;而原始组织细小的等轴晶迅速转变为球状结构.The microstructural evolution of A356 produced by controlled pouring during partial remelting and isothermal holding was investigated in this study. The results show that the original structure affects the microstrucrural evolution process in a great extent. The material with a very dendritic microstructure is still solid network even after a relatively long holding time, while the material with fine dendrites is susceptible for developing into globular structure.

关 键 词：原始组织 枝晶衍变 颗粒尺寸 颗粒圆整度 

分 类 号：TF77[冶金工程—钢铁冶金]