Effect of heat treatment on microstructure and properties of as-forged TC21 titanium alloy

doi:10.13251/j.issn.0254-6051.2024.04.032

Abstract

Abstract: 12 kinds of solution treatment+aging processes were designed to study the microstructure and mechanical properties of as-forged TC21 titanium alloy under different solution treatment(880-920 ℃) and aging temperatures(500-650 ℃). The results show that as the solution treatment temperature rises, there is a reduction in the primary α phase′s volume and dimensions, leading to decreased ductility. At the same solution temperature, the change in aging temperature affects the content and size of the secondary α phase. With the aging temperature increasing, the dispersion degree of the secondary α phase increases, and the yield strength of the titanium alloy increases first and then decreases. When the aging temperature is too high, and reaches 650 ℃ the secondary α phase becomes coarse. Specimen is subjected only to solution treat at 920 ℃ for 2 h, Which exhibites a yield strength (R_p0.2) of 1107.0 MPa and a tensile strength (R_m) of 1238.5 MPa. The addition of subsequent aging treatment significantly enhances the yield and tensile strength. Especially, by solution treatment at 920 ℃ for 2 h followed by aging at 590 ℃ for 4 h, the as-forged TC21 titanium alloy achieves excellent comprehensive mechanical properties, with a yield strength (R_p0.2) of 1237.7 MPa and a tensile strength (R_m) of 1322.0 MPa.

Key words: TC21 titanium alloy, solution treatment and aging, microstructure, mechanical properties

CLC Number:

TG146.23

He Rui, Wang Jie, Yin Hui, Zhai Ruizhi, Xiang Wei, Lü Dongli, Yin Yaoji. Effect of heat treatment on microstructure and properties of as-forged TC21 titanium alloy[J]. Heat Treatment of Metals, 2024, 49(4): 201-208.

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