Effect of surface oxidizing at 550 ℃ on wear resistance of Ti-6Al-4V alloy

doi:10.13251/j.issn.0254-6051.2021.01.024

Abstract

Abstract: Thermal oxidation (TO) of Ti-6Al-4V alloy was performed at 550 ℃ for 60 h in air,and the surface morphology,microstructure,composition,hardness,scratch performance and wear resistance of the TO treated and untreated alloy were evaluated and compared.The results reveal that the surface roughness of the Ti alloy increases a little after TO,an oxygen-diffusion layer of about 3.5 μm thickness is formed on the surface,and anatase,rutile,brookite TiO₂ and Al₂O₃ phases are detected by X-ray diffraction (XRD).The microhardness and nano hardness of the oxygen-diffusion layer are 804.6 HV0.025 and 14.5 GPa,respectively,which is 143.7% higher than that of the untreated substrate,and no cracking is observed around the indentations.The maximum scratch depth is significantly reduced from 12 μm to 4 μm after TO,and the wear rate decreases from 354.33×10^-6 mm³/Nm to 1.44×10^-6 mm³/Nm,and the main wear mechanism of the oxygen-diffusion layer is slight abrasive wear.It is concluded that the surface TO treatment considerably increases the surface hardness and wear resistance of the Ti-6Al-4V alloy,but leads no obvious inner microstructure coarsening and softening,thus could be a potential method to improve the surface wear resistance of Ti alloys.

Key words: surface oxidizing, titanium alloy, oxygen-diffusion layer, hardness, wear resistance

CLC Number:

TG166.5

Yang Jie, Zhang Qingke, Li Qiong, Song Zhenlun, Wu Xiaochun. Effect of surface oxidizing at 550 ℃ on wear resistance of Ti-6Al-4V alloy[J]. Heat Treatment of Metals, 2021, 46(1): 125-132.

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