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苏彦庆,叶喜葱,郭景杰,傅恒志.TiAl基合金金属型真空吸铸成形方法研究[J].稀有金属材料与工程(英文),2009,38(9):1505~1508.[Su Yanqing,Ye Xicong,Guo Jingjie,Fu Hengzhi.Study on Vacuum Suction Casting for TiAl-Based Alloys[J].Rare Metal Materials and Engineering,2009,38(9):1505~1508.]
Study on Vacuum Suction Casting for TiAl-Based Alloys
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Received:October 08, 2008  
Key words: vacuum suction casting  numerical simulation  graphite throat diameter  solid fraction  filling fraction
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Author NameAffiliation
Su Yanqing Harbin Institute of Technology, Harbin 150001, China 
Ye Xicong  
Guo Jingjie  
Fu Hengzhi  
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      A novel type of foundry method for TiAl-based alloy is presented in the present paper. The filling processes of Ti-47Al alloy sheet and blade have been studied via numerical simulation. The investigation results indicate that the filling fraction is enhanced by the increase of filling velocity and graphite throat diameter. The graphite throat diameter is the main parameter for the backward filling location in the process of vacuum suction casting. With the increase of mould temperature, the solid fraction is reduced. The alloy solidification begins from bottom to top. The TiAl sheet and the blade are produced by this method. The grain size of the sheet is in the range from 10 μm to 40 μm. There is no obvious shrinkage cavity