中国铸造2009，Vol.6Issue(3)：208-213,6.
Solute redistribution and Rayleigh number in the mushy zone during directional solidification of Inconel 718
Solute redistribution and Rayleigh number in the mushy zone during directional solidification of Inconel 718
摘要
Abstract
The interdendritic segregation along the mushy zone of directionally solidified superalloy Inconel 718has been measured by scanning electron microscope (SEM) and energy dispersion analysis spectrometry (EDAX)techniques and the corresponding liquid composition profile was presented. The liquid density and Rayleigh number (Ra) profiles along the mushy zone were calculated as well. It was found that the liquid density difference increased from top to bottom in the mushy zone and there was no density inversion due to the segregation of Nb and Mo. However carbide formation in the freezing range and the preferred angle of the odentated dendrite array could prompt the fluid flow in the mushy zone although there was no liquid density inversion. The largest relative Rayleigh number appeared at 1,326℃ for Inconel 718 where the fluid flow most easily occurred.关键词
superalloy/directional solidification/segregation/fluid flowKey words
superalloy/directional solidification/segregation/fluid flow分类
矿业与冶金引用本文复制引用
Wang Ling,Dong Jianxin,Liu Lin,Zhang Lei..Solute redistribution and Rayleigh number in the mushy zone during directional solidification of Inconel 718[J].中国铸造,2009,6(3):208-213,6.基金项目
This work was financially supported by the National Natural Science Foundation of China (No. 50371006)and the school fund of Nanjing University of Information Science and Technology. （No. 50371006）
