Transactions of Materials and Heat Treatment

Title：High temperature rheological behavior and hot processing properties on hydrogenated Ti65 titanium alloy

Authors： Shao Guangbao1 Hu Jin2 Zhan Keqin1 Xi Guoqing1 Tian Zhuang2 Zuo Pei1 Deng Lei2 Li Wenbin2

Unit： 1. Hubei Tri-Ring Forging Co. Ltd. 2. State Key Laboratory of Material Processing and Die and Mould Technology Huazhong University of Science and Technology

KeyWords： hydrogenated Ti65 titanium alloy rheological behavior constitutive equation hot processing map hydrogen content

ClassificationCode：TG316

year,vol(issue):pagenumber：2023,48(8):253-260

Abstract：

Ti65 titanium alloy has excellent high-temperature strength, hot stability and creep resistance, but its hot forming temperature is high and deformation resistance is large. As a high-temperature plasticizing process of titanium alloy, hot hydrogen treatment can significantly reduce the deformation resistance of Ti65 titanium alloy during high-temperature forming and improve its hot processing properties. Therefore, in order to study the influence of hydrogen content on the high-temperature rheological behavior and hot processing properties of Ti65 titanium alloy and explore the optimal hydrogen content and the forming process windows of Ti65 titanium alloy, hot compression experiments were carried out on Ti65 titanium alloy samples under different hydrogen contents. The results show that when hydrogenated Ti65 titanium alloy is deformed at the temperature range of 790-940 ℃, the optimal hydrogen content (mass fraction) is 0.25%, and the peak stress decreases by about 66.8% compared with the non-hydrogenated titanium alloy. Based on the true stress-true strain curve data, the Arrhenius constitutive equation of Ti65 titanium alloy with hydrogen content of 0.25% was established, and the hot processing maps of Ti65 titanium alloy under the conditions of the true strains of 0.2, 0.4 and 0.6 were also established. The research finds that when Ti65 titanium alloy is deformed at the temperature of 840-880 ℃ and the strain rate of greater than 0.01 s-1, the instability phenomenon occurs, and with increasing of the strain, the unstable region shrinks, while deformed at the temperature of 790-840 ℃ and the strain rate of 0.01-1 s-1, it has good hot processing properties.

Funds：

湖北省重点研发计划（2020BAB040）

作者简介：邵光保（1979-），男，工学学士，高级工程师,E-mail：13871609838@163.com

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