Numerical simulation of microstructure evolution during directional solidification process in directional solidified (DS) turbine blades  

作　　者：ZHANG Hang XU QingYan TANG Ning PAN Dong 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(Technological Sciences)》2011年第12期3191-3202,共12页中国科学（技术科学英文版）

基　　金：supported by the National Basic Research Program of China (Grant Nos. 2005CB724105, 2011CB706801);National Natural Science Foundation of China (Grant No. 10477010);National High Technology Research and Development Program of China (Grant No. 2007AA04Z141);Important National Science & Technology Specific Projects (Grant Nos. 2009ZX04006-041, 2011ZX04014-052)

摘　　要：Directional solidified(DS) turbine blades are widely used in advanced gas turbine engine. The size and orientation of columnar grains have great influence on the high temperature property and performance of the turbine blade. Numerical simulation of the directional solidification process is an effective way to investigate the grain's growth and morphology,and hence to optimize the process. In this paper,a mathematical model was presented to study the directional solidified microstructures at different withdrawal rates. Ray-tracing method was applied to calculate the temperature variation of the blade. By using a Modified Cellular Automation(MCA) method and a simple linear interpolation method,the mushy zone and the microstructure evolution were studied in detail. Experimental validations were carried out at different withdrawal rates. The calculated cooling curves and microstructure agreed well with those experimental. It is indicated that the withdrawal rate affects the temperature distribution and growth rate of the grain directly,which determines the final size and morphology of the columnar grain. A moderate withdrawal rate can lead to high quality DS turbine blades for industrial application.

关 键 词：directional solidified （DS） turbine blade Cellular Automation （CA） numerical modeling and simulation 

分 类 号：TG244.3[金属学及工艺—铸造] V232.4[航空宇航科学与技术—航空宇航推进理论与工程]