Numerical simulation of columnar to equiaxial transition during solidification of Ti-44at% Al alloy

被引：1
|
作者：
Wang Kuang-Fei [1 ]
Li Bang-Sheng
Ren Ming-Xing
Mi Guo-Fa
Guo Jing-Jie
Fu Heng-Zhi
机构：
[1] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 15001, Peoples R China
[2] Henan Polytech Univ, Sch Mat Sci & Engn, Jiaozuo 454100, Peoples R China
来源：
ACTA PHYSICA SINICA | 2007年 / 56卷 / 06期
关键词：
TiAl alloys; solute shock wave; columnar to equiaxial transition;
D O I：
10.7498/aps.56.3337
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Solute diffusion controlled solidification model was employed to simulate the columnar to equiaxial transition (CET) of TiAl alloy casting. The simulation results show that solute shock wave occurs when the diffusion fields of columnar and equiaxial dendrites meet. It could be one of the main factors blocking the columnar dendrite growth. Using this model, the CET in small castings was qualitatively predicted. It was found that the thermal gradient and solute undercooling ahead of the columnar tips of CET act jointly on CET, being in good agreement with experimental observations.
引用
收藏
页码：3337 / 3343
页数：7
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