Surface oxygen diffusion strengthening of near β titanium alloy by pre-coating

doi:10.13251/j.issn.0254-6051.2021.06.015

Abstract

Abstract: Oxygen diffusion on near β titanium alloy Ti-1023 with surface protection coating was conducted at different temperatures and in different atmospheres. The superficial microstructure and microhardness gradient of the alloy were characterized. The results indicate that the high temperature oxidation behavior of the alloy is repressed with surface coating, leading to formation of dense oxygen diffusion layer rather than porous brittle oxides, which can increase the surface hardness of the alloy. In the air atmosphere, the surface microhardness of the Ti-1023 alloy increases from 321 HV0.2 to 544 HV0.2, with the depth of over 500 μm when treated at 850 ℃ for 24 h. When treated at 750 ℃ for 48 h, which is below T_β temperature in oxygen, the surface microhardness can be raised to 459 HV0.2 with basic structure maintained.

Key words: Ti-1023 titanium alloy, surface strengthening, microhardness, oxygen diffusion

CLC Number:

TG146.23

Tong Jianbo, Li Xuefei, Huang Lijun, Zhang Wenqiang. Surface oxygen diffusion strengthening of near β titanium alloy by pre-coating[J]. Heat Treatment of Metals, 2021, 46(6): 74-78.

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