Numerical simulation of directional solidification microstructure of Ti-45A1 alloy based on CA method
In recent years ordered Y-TiAl based alloys have been extensively studied as the next generation materials of the aeroengine turbine blade because of their excellent high temperature performances. In the present paper, the numerical model of microstructure evolution during directional solidification process of T1-45AI (at％) alloy was established based on CA method, which took into account the peritectic reaction process of binary alloy and simulated the directional solidification process with indium-gallium alloy liquid metal cooling. Simulated results show that the solidified microstructure can be divided into three regions consisting of primary equiaxed grain, stable columnar grain growth region and the transition region. In addition, microstructure of stable columnar grain was simulated at the withdrawal rates of 0.1 mm/min, 1 mm/min and 5 mm/min, respectively. The simulation results show that the primary dendrite arm spacing of the columnar grains decreased with the increasing withdrawal rate. At the withdrawal rate of 0.1 mm/min, the simulation region was dominated by primary ?phase, and a small number of peritectic or phase can be observed in the solute-rich interspace between ?dendrites, which agrees with the published experimental results very well.
sloshing Y-TiAl based alloy directional solidification peritectic reaction simulation of microstructure
Xu Jixiang Cheng Jin Xu Qingyan Zhang Hu Zheng Lijing Liu Baicheng
Department of Mechanical engineering, Tsinghua University, Beijing 100084 School of Materials Science and Engineering, Beihang University, Beijing 100191, China
国际会议
The 11th Asian Foundry Congress(第11届亚洲铸造会议 AFC-11)
广州
英文
1-6
2011-11-12（万方平台首次上网日期，不代表论文的发表时间）