High temperature mechanical properties of near α, (α+β) and near β type titanium alloys

doi:10.13251/j.issn.0254-6051.2022.11.035

Abstract

Abstract: High temperature mechanical properties of near α type TA15 and Ti60, near β type TB17, (α+β) type TC21 titanium alloys at 100, 400, 500, 600, 650 and 700 ℃ were investigated. The results show that when the temperature is in the range of 100-500 ℃, the high temperature strength of TB17 alloy is the highest, and that of the TA15 alloy is the lowest. The high temperature strength of the TC21 alloy is higher than that of the Ti60 alloy. When temperature exceeds 600 ℃, the high temperature properties of the TB17 alloy change significantly, and the high temperature strength is the lowest. While the Ti60 alloy changes the least, and the high temperature strength is the highest. The high temperature strength of the TC21 alloy is between that of the TA15 and Ti60 alloys, and gradually closes to that of TA15 alloy. When the temperature is 100 ℃, the engineering stress-strain curves of the four alloys are in a relatively balanced state because of comparable strain hardening and strain softening effects. When the temperature is 400 ℃, the deformation mechanism of the TB17 alloy is dominated by strain softening, and the stress decreases significantly with the increase of strain. When the temperature is 600 ℃, the deformation mechanism of the TC21 and TA15 alloys is also dominated by strain softening, while the stress drop of the TA15 alloy is lower than that of the TC21 alloy. Until the temperature is 650 ℃, the deformation mechanism of the Ti60 alloy is dominated by strain softening.

Key words: titanium alloy, high temperature property, mechanical behavior

CLC Number:

TG146

Li Mingbing, Wang Xinnan, Shang Guoqiang, Zhu Liwei, Li Xing, Zhu Zhishou. High temperature mechanical properties of near α, (α+β) and near β type titanium alloys[J]. Heat Treatment of Metals, 2022, 47(11): 199-204.

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