Effects of Particle Collision Treatments on Fatigue Strength of Ti–6Al–4V Alloy with Polishing Marks

In this study, we attempted to nullify the harmful influences of processing marks on fatigue strength Ti–6Al–4V alloy by particle collision treatments. As surface treatments, fine bombarding (FPB) and shot peening (SP) were applied form hardened layers introduce compressive residual stress. The objective material was polished a mirror eliminate machining specimens then grinded with emery papers (#80) make uniform marks. After conditions, hardness distributions stress systematically examined, their relationships considered in detail. On observation surfaces, eliminated At same time, increased high introduced. result, markedly improved treatments beyond level without deterioration mechanical properties. improvement rates high, at 75% FPB treatment 58% SP treatment.