Influence of Pouring Temperature and Mold Preheating Temperature on Investment Casting of TiAl
γ-TiAl alloys are emerging as potential light-weight, high-temperature structural materials and possess wide capacities of engineering applications in aeronautics, space and automobile industries because of their low density, high specific strength and specific modulus, good oxidation-resistance and creep-resistance. Investment casting is introduced to complex TiAl net-shape or near net-shape components. However, tendency of hot cracking of TiAl cast comes from the hindered shrinkage during solidification process. The present study mAlnly focuses on the fabrication of ceramic shell mould for TiAl investment casting. Optimisation of reducing the stress in cast-mould system was carried out. The processing technology of the invented ceramic shell moulds was successfully verified in the investment casting of prototype TiAl parts and the rate of finished products was enhanced. The influence of temperatures (pouring temperature and mould preheating temperature) on microstructures of TiAl investment castings was carried out. The results showed that the grAln size increased from 53μm to 137μm with pouring temperature enhanced from 1650℃ to 1750℃. However, the mould preheating temperatures have little impact on the grAln size. The interfacial reaction layers between TiAl alloys and ceramic shell mould were examined at the same time.
TiAl investment casting microstructures temperature interfacial reactions
Tian Jing Chen Yanfei Xiao Shulong Xu Lijuan Chen Yuyong
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
国际会议
69th World Foundry Congress(第69届世界铸造会议 WFC 2010)
杭州
英文
983-986
2010-10-16（万方平台首次上网日期，不代表论文的发表时间）