Transactions of Materials and Heat Treatment

Title：Hot deformation behavior of extruded Ti-46Al-(V,Cr,Ni) alloy

Authors： Guan Hong Zhu Haifeng Kong Fantao Tai Qing′an Wang Xiaopeng Chen Yuyong

Unit： AECC Shenyang Liming Aero-engine Group Corporation Harbin Institute of Technology

KeyWords： TiAl alloy extrusion hot deformation behavior microstructure evolution hot working diagram deformation temperature

ClassificationCode：TG146.2

year,vol(issue):pagenumber：2019,44(7):158-164

Abstract：

The hot deformation behavior and microstructural evolution of the extruded Ti-46Al-(V,Cr,Ni) alloy were investigated by the thermal/force physics simulation method, and the hot working window was obtained. Based on the energy dissipation efficiency obtained by the calculation analysis and the instability criterion, the hot working diagram of the extruded Ti-46Al-(V,Cr,Ni) alloy was established. Then, with the increasing of hot deformation temperature, the recrystallization γ grain size increases, and the volume fraction of γ grain increases first and then decreases, but the volume fraction of α2/γ lamellar colonies is opposite to that of γ grains. Therefore, the lower or higher deformation temperature adversely affects the uniformity of deformed microstructure. Comprehensive consideration of the research results of hot processing window, hot working diagram and alloy structures, the best hot deformation conditions of the extruded Ti-46Al-(V,Cr,Ni) alloy are (1160-1220 ℃) and (0.004-0.02 s-1), respectively.

Funds：

国家自然科学基金资助项目（51471056）

关红（1968-），女，学士，高级工程师，E-mail：1277479262@qq.com；通讯作者：孔凡涛（1971-），男，博士，教授，E-mail：kft@hit.edu.cn

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