Influence of multi-stage heat treatment on the microstructure and mechanical properties of TC21 titanium alloy

Wei Long; Song Zhang; Yi-long Liang; Mei-gui Ou

doi:10.1007/s12613-020-1996-1

Volume 28 Issue 2

Feb. 2021

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2021 > 28(2): 296-304

Wei Long, Song Zhang, Yi-long Liang, and Mei-gui Ou, Influence of multi-stage heat treatment on the microstructure and mechanical properties of TC21 titanium alloy, Int. J. Miner. Metall. Mater., 28(2021), No. 2, pp. 296-304. https://doi.org/10.1007/s12613-020-1996-1

Cite this article as:

Wei Long, Song Zhang, Yi-long Liang, and Mei-gui Ou, Influence of multi-stage heat treatment on the microstructure and mechanical properties of TC21 titanium alloy, Int. J. Miner. Metall. Mater., 28(2021), No. 2, pp. 296-304. https://doi.org/10.1007/s12613-020-1996-1

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Research Article

Influence of multi-stage heat treatment on the microstructure and mechanical properties of TC21 titanium alloy

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Corresponding author:
Mei-gui Ou E-mail: rose8239@163.com
Received: 5 November 2019; Revised: 19 January 2020; Accepted: 1 February 2020; Available online: 11 February 2020

Abstract

Abstract

Duplex-structured TC21 alloy samples were first solution-treated at a higher temperature in the α + β region (940°C) with furnace cooling (FC), air cooling (AC), and water cooling (WC), followed by a second-stage solution treatment at a lower temperature in the α + β region (900°C), and then finally aged at 590°C. The effects of the morphology and quantity of α phases on the structure and properties of the TC21 alloy after the different heat treatments were analyzed. The in-situ tensile deformation process and crack propagation behavior were observed using scanning electron microscopy (SEM). The quantity of equiaxed α phases as well as the thickness of lamellar α phases reduced, the tensile strength increased firstly and then decreased, the elongation decreased with the increasing cooling rate after the first-stage solution treatment. The amount and size of lamellar α phases increased after the second-stage solution treatment because of sufficient diffusion of the alloying elements, thereby leading to increased tensile strength. The amount of dispersed α phases increased after the third-stage aging treatment owing to the increase in the nucleation rate, resulting in a noteworthy strengthening effect. After the third-stage aging treatment, the first-stage FC sample exhibited better mechanical properties because it contained more equiaxed α and β_trans phases than the first-stage AC and WC samples.
- multi-stage heat treatment;
- titanium alloy;
- in-situ tension;
- microstructure;
- mechanical properties

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