Influence of solution treatment temperature on microstructure and mechanical properties of TC4 titanium alloy prepared by 3D printing

doi:10.13251/j.issn.0254-6051.2020.11.032

Abstract

Abstract: Microstructure and mechanical properties of TC4 titanium alloy prepared by 3D printing after solution at different temperature and then aging at 490 ℃ were studied through microstructure observation and mechanical property test. The results indicate that the microstructure of the original 3D printed deposition sate is non-uniform basket-weave structure. After solution and aging treatment, with the increase of solution temperature, the α phase first grows in the form of flakes near the complete original grain boundary, and then gradually transforms into a coarse lath shape, and the strength gradually increases while the plasticity decreases, reaching the maximum value of 1100 MPa when solution temperature is 920 ℃. As the solution temperature further increases and exceeds 960 ℃, the α phase is gradually dissolved, which leads to the decrease of the strength and the plasticity. The macro morphologies of the tensile fracture under different solution temperature are all dark gray. According to a large number of dimples observed in the micro morphologies of those fracture, the tensile fracture mechanism of the TC4 titanium alloy can be judged as ductile fracture when solution treated at 890-960 ℃ and aged at 490 ℃. Combining the changes in the microstructure and mechanical properties of the TC4 titanium alloy after different solution and aging treatments, it can be concluded that the TC4 titanium alloy prepared by 3D printing has better comprehensive mechanical properties when solution treated at 920 ℃ and then aged at 490 ℃.

Key words: solution temperature, TC4 titanium alloy, 3D printing, microstructure, mechanical properties

CLC Number:

TG146

Lu Yuanyuan, Zhang Yi, Guo Shuai, Liu Weifeng. Influence of solution treatment temperature on microstructure and mechanical properties of TC4 titanium alloy prepared by 3D printing[J]. Heat Treatment of Metals, 2020, 45(11): 171-176.

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