Effect of aging temperature on microstructure and hardness of laser selective melting TC21 titanium alloy

doi:10.13251/j.issn.0254-6051.2022.04.025

Abstract

Abstract: Effect of aging temperature on microstructure and properties of laser selective melting (SLM) formed TC21 titanium alloy was systematically investigated by means of microstructure observation and hardness test. The results show that when the aging temperature is lower, the secondary α phase precipitates in the form of dispersive needle with the increase of temperature, the dispersion degree increases with the increase of temperature, and the volume fraction of β precipitates increases with the increase of temperature. When the aging temperature is too high, the secondary α phase is coarsened to form a larger flake α phase, and the strengthening effect decreases. When the aging temperature is 450 ℃, the microstructure of the SLM formed TC21 titanium alloy is the most dispersive and uniform, and the hardness is up to 575 HV5, which is 43.3% higher than that of the SLM formed state. It is proposed that the aging temperature of the SLM formed TC21 titanium alloy is controlled at 450 ℃ as the optimum.

Key words: laser selective melting, TC21 titanium alloy, aging temperature, microstructure, hardness

CLC Number:

TG156.9

Sun Kai, Chen Yan, Yang Shaobin. Effect of aging temperature on microstructure and hardness of laser selective melting TC21 titanium alloy[J]. Heat Treatment of Metals, 2022, 47(4): 155-158.

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