Numerical Simulation of Microporosity Evolution of Aluminum Alloy Castings  

作　　者：Shuyong DONG, Shoumei XIONG and Baicheng LIUDepartment of Mechanical Engineering, Tsinghua University, Beijing 100084, China 

出　　处：《Journal of Materials Science & Technology》2004年第1期23-26,共4页材料科学技术（英文版）

基　　金：supported by the key project of NSFC(59990470-3);State Significant Fundamental Research Program of MOST(G2000067208-3).

摘　　要：A mathematical model to calculate the size and distribution of microporosities was studied and coupled with a stochastic microstructure evolution model. The model incorporates various solidification phenomena such as grain structure evolution, solidification shrinkage, interdendritic fluid flow and formation and growth of pores during solidification processes. The nucleation and growth of grains were modeled with a cellular automaton method that utilizes the results from a macro scale modeling of the solidification process. Experiments were made to validate the proposed models. The calculated results of aluminum alloy castings agreed with the experimental measurements.A mathematical model to calculate the size and distribution of microporosities was studied and coupled with a stochastic microstructure evolution model. The model incorporates various solidification phenomena such as grain structure evolution, solidification shrinkage, interdendritic fluid flow and formation and growth of pores during solidification processes. The nucleation and growth of grains were modeled with a cellular automaton method that utilizes the results from a macro scale modeling of the solidification process. Experiments were made to validate the proposed models. The calculated results of aluminum alloy castings agreed with the experimental measurements.

关 键 词：Numerical simulation Microporosity evolution Aluminum alloy castings 

分 类 号：TG282[金属学及工艺—铸造]