Evolution laws of microstructures and mechanical properties during heat treatments for near-<b>α</b> high-temperature titanium alloys

Xiaozhao Ma; Zhilei Xiang; Tao Li; Yilan Chen; Yingying Liu; Ziyong Chen; Qun Shu

doi:10.1007/s12613-021-2248-8

Volume 29 Issue 8

Aug. 2022

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2022 > 29(8): 1596-1607

Xiaozhao Ma, Zhilei Xiang, Tao Li, Yilan Chen, Yingying Liu, Ziyong Chen, and Qun Shu, Evolution laws of microstructures and mechanical properties during heat treatments for near-α high-temperature titanium alloys, Int. J. Miner. Metall. Mater., 29(2022), No. 8, pp. 1596-1607. https://doi.org/10.1007/s12613-021-2248-8

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Xiaozhao Ma, Zhilei Xiang, Tao Li, Yilan Chen, Yingying Liu, Ziyong Chen, and Qun Shu, Evolution laws of microstructures and mechanical properties during heat treatments for near-α high-temperature titanium alloys, Int. J. Miner. Metall. Mater., 29(2022), No. 8, pp. 1596-1607. https://doi.org/10.1007/s12613-021-2248-8

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Research Article

Evolution laws of microstructures and mechanical properties during heat treatments for near-α high-temperature titanium alloys

+ Author Affiliations

Corresponding author:
Ziyong Chen E-mail: czy@bjut.edu.cn
Received: 21 September 2020; Revised: 7 December 2020; Accepted: 5 January 2021; Available online: 6 January 2021

Abstract

Abstract

Evolution laws of microstructures, mechanical properties, and fractographs after different solution temperatures were investigated through various analysis methods. With the increasing solution temperatures, contents of the primary α phase decreased, and contents of transformed β structures increased. Lamellar α grains dominated the characteristics of transformed β structures, and widths of secondary α lamellas increased monotonously. For as-forged alloy, large silicides with equiaxed and rod-like morphologies, and nano-scale silicides were found. Silicides with large sizes might be (Ti, Zr, Nb)₅Si₃ and (Ti, Zr, Nb)₆Si₃. Rod-like silicides with small sizes precipitated in retained β phase, exhibiting near 45° angles with α/β boundaries. Retained β phases in as-heat treated alloys were incontinuous. 980STA exhibited an excellent combination of room temperature (RT) and 650°C mechanical properties. Characteristics of fracture surfaces largely depended on the evolutions of microstructures. Meanwhile, silicides promoted the formation of mico-voids.
- solution temperatures;
- microstructures;
- mechanical properties;
- fractographs;
- silicides

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