Three-dimensional microstructure simulation of Ni-based superalloy investment castings  

作　　者：PAN Dong XU QingYan LIU BaiCheng 

机构地区：[1]Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2011年第5期851-855,共5页中国科学：物理学、力学、天文学（英文版）

基　　金：financially supported by the National Basic Research Program of China (Grant Nos. 2005CB724105 and 2011CB706801);the National Natural Science Foundation of China (Grant No. 10477010);the National High Technology Research, Development Program of China (Grant No. 2007AA04Z141);the Important National Science & Technology Specific Projects (Grant No. 2009ZX04006-041-04)

摘　　要：An integrated macro and micro multi-scale model for the three-dimensional microstructure simulation of Ni-based superalloy investment castings was developed, and applied to industrial castings to investigate grain evolution during solidification. A ray tracing method was used to deal with the complex heat radiation transfer. The rnicrostructure evolution was simulated based on the Modified Cellular Automaton method, which was coupled with three-dimensional nested macro and micro grids. Experi- ments for Ni-based superalloy turbine wheel investment casting were carried out, which showed a good correspondence with the simulated results. It is indicated that the proposed model is able to predict the microstructure of the casting precisely, which provides a tool for the optimizing process.An integrated macro and micro multi-scale model for the three-dimensional microstructure simulation of Ni-based superalloy investment castings was developed, and applied to industrial castings to investigate grain evolution during solidification. A ray tracing method was used to deal with the complex heat radiation transfer. The microstructure evolution was simulated based on the Modified Cellular Automaton method, which was coupled with three-dimensional nested macro and micro grids. Experiments for Ni-based superalloy turbine wheel investment casting were carried out, which showed a good correspondence with the simulated results. It is indicated that the proposed model is able to predict the microstructure of the casting precisely, which provides a tool for the optimizing process.

关 键 词：MICROSTRUCTURE SIMULATION Ni-based superalloy investment casting 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG146.15[金属学及工艺—金属材料]