Effect of Pre-Corrosion and Shot peening on the Fretting Fatigue Properties of Ti6Al4V Titanium Alloy

摘要

The dovetail assembly of titanium alloy compressor blades for aircraft engines serving in marine environments will experience corrosion and coupled fretting fatigue damage. Therefore, this article explores the effects of salt spray pre corrosion and shot peening on the fretting fatigue performance of Ti6Al4V titanium alloy. Research has shown that shot peening can sign ificantly improve the fretting fatigue resistance of Ti6Al4V titanium alloy; The one month salt spray pre corrosion has no significant effect on the fretting fatigue performance of Ti6Al4V titanium alloy substrate; However, within the test stress range of 250MPa - 650MPa, salt spray pre corrosion actually improved the fretting motion fatigue life of Ti6Al4V titanium alloy subjected to shot peening treatment. Among them, the fretting motion fatigue life increased the most under the test condition of 450MPa s tress, with an increase of 44.4%. This is due to the solid lubrication effect of the corrosion products on the surface of the shot peened titanium alloy sample and the NaCl solid particles accumulated in the shot pits, which reduced the fretting motion dam age on the surface of the titanium alloy and thus improved its fretting motion fatigue life.