Effect of heat treatment process on mechanical properties at room temperature and high temperature of TC21 titanium alloy

doi:10.13251/j.issn.0254-6051.2025.02.029

Abstract

Abstract: TC21 titanium alloy with different α phase lamella distributions was prepared by designing different heat treatment processes, and the precipitation of secondary α phase was controlled by aging. Combined with the results of mechanical property testing and analysis at room temperature and high temperatures, the effect of heat treatment on mechanical properties at room temperature and high temperatures of the TC21 titanium alloy was studied. The results show that after solution treatment at 980 ℃, following by annealing at 770 ℃, 810 ℃ and 850 ℃, respectively, the strength at room temperature of the alloy decreases with the increase of annealing temperature, while the plasticity increases. After annealing and aging at 550 ℃ for 4 h, the strength at room temperature of the alloy increases with the increase of annealing temperature, while the plasticity shows the opposite trend. With the increase of tensile test temperature, the plasticity of the TC21 titanium alloy treated by different processes is improved, and the strength retention rate is above 65% at 500 ℃, and the strength of TC21 titanium alloy annealed at 850 ℃ and aged at 550 ℃ is higher when used below 500 ℃.

Key words: TC21 titanium alloy, heat treatment process, mechanical properties

CLC Number:

Jiang Long, Zhao Wenpu, Zhang Chaoqun. Effect of heat treatment process on mechanical properties at room temperature and high temperature of TC21 titanium alloy[J]. Heat Treatment of Metals, 2025, 50(2): 187-193.

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