Solution hardening behavior of oxygen atom in oxygen-rich layer of hot rolled TC4 titanium alloy plate

doi:10.13251/j.issn.0254-6051.2020.10.018

Abstract

Abstract: Distribution law of oxygen concentration in the oxygen-rich layer of hot rolled TC4 titanium alloy plate was studied by spectrum analysis of the oxygen concentration at different depth from the surface. The effect of the oxygen concentration on the hardness of oxygen-rich layer was also studied.The results show that the thickness of oxygen-rich layer is about 60 μm; with the increase of distance from the surface, the oxygen concentration in the oxygen-rich layer decreases gradually; the thickness of the hardened layer is equal to that of the oxygen-rich layer, and the hardness decreases with the increase of distance from the surface. The interstitial solution hardening effect of oxygen atoms in the oxygen-rich layer leads to the formation of hardened layer in the alloy. The relationship between oxygen concentration, depth from surface and microhardness is established.

Key words: TC4 titanium alloy, oxygen-rich layer, hardened layer, oxygen in solid solution

CLC Number:

TG146.2⁺3

Cui Yan, Chen Yudong, Dong Changqing, Sun Xinjun. Solution hardening behavior of oxygen atom in oxygen-rich layer of hot rolled TC4 titanium alloy plate[J]. Heat Treatment of Metals, 2020, 45(10): 90-93.

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