|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||GAT-2017 (Gamma Alloys Technology - 2017)
||Microstructure and Mechanical Properties of TiAl Alloys Prepared by Cold Crucible Directional Solidification
||Ruirun Chen, Jingjie Guo, Hongsheng Ding, Hengzhi Fu
|On-Site Speaker (Planned)
Cold crucible directional solidification (CCDS) is a newly developed technique, which combines the advantages of the cold crucible and continuous melting. It can be applied to directionally solidify reactive, high purity and refractory materials. This paper describes the principle of CCDS and its characteristics; the measured and numerical calculated results of the flow field and temperature field during CCDS of Ti based alloys. Ti6Al4V, TiAl alloys and high Nb-containing TiAl alloys have been directionally solidified with different cold crucibles. The cross-sections of the cold crucibles include round, near rectangular and square with different sizes. Effects of solidification velocity and temperature gradient on microstructure and mechanical properties of TiAl alloys have been studied. Tensile testing results show that the elongation of directionally solidified Ti6Al4V can be improved to 12.7% from as cast 5.4%. The strength and the elongation of the directionally solidified Ti47Al2Cr2Nb and Ti44Al6Nb1.0Cr2.0V are 650 MPa/3% and 602.5 MPa/1.20%, respectively.
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