Microstructures and mechanical properties of hot-pack rolled Ti-43Al-9V-Y alloy sheet

被引:1
作者
孔凡涛 [1 ]
陈玉勇 [1 ]
王威 [1 ]
刘志光 [1 ]
肖树龙 [1 ]
机构
[1] School of Materials Science and Engineering,Harbin Institute of Technology
关键词
titanium aluminides; sheet; heat treatment; microstructure; mechanical properties;
D O I
暂无
中图分类号
TG146.23 [];
学科分类号
080502 ;
摘要
Ti-43Al-9V-Y alloy sheets with dimensions of 300 mm×100 mm×(1.5-2)mm were produced by hot-pack rolling.After rolling,the microstructure of Ti-43Al-9V-Y alloy sheet becomes near gamma(NG),which is comprised ofγ+B2 phases.After heat treatment(HT)at 1 200-1 320℃for 30 min followed by furnace cooling(FC),network shape structure of B2 phases in as-rolled microstructure is retained on the whole.Moreover,with increasing the HT temperature,precipitation of B2 phase lamellae in equiaxedγgrains is increased.Equiaxedγgrains transform partly toα2/γ/B2 lamellar structure after the heat treatment at 1 320℃ for 30 min.Tensile test results show that room-temperature yield strength(YS)and ultimate tensile strength(UTS)of the as-rolled material are 509 and 612 MPa,respectively.With the test temperature increasing,the YS and UTS of the as-rolled are decreased,but the elongation is improved.After HT at 1 200℃,both yield strength and fracture strength of Ti-43Al-9V-Y alloy sheet are the lowest.With HT temperature increasing,fracture strength is increased obviously,but yield strength of the sheet after HT at 1 280℃ is the highest,about 869 MPa.
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页码:1126 / 1130
页数:5
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