Effects of Carbon-Doped Oxidation with Shot Peening on the Fretting Fatigue Strength of Ti-6Al-4V Alloy

Abstract

  The effect of surface-treatment on the plain fatigue and fretting fatigue behaviors of Ti-6Al-4V was investigated using specimens subjected to four processes/treatments: surface polishing (A), polishing followed by shot peening (A-SP), carbon-doped oxidation (B) and carbon-doped oxidation followed by shot peening (B-SP). B-SP-treated specimens showed the highest fretting fatigue limit for B-treated fretting pad, and the A-treated specimens showed the highest plain fatigue limit. These results are discussed considering surface conditions, residual stresses and fractographic details as induced by the surface treatments. It was found that the compressive residual stresses and the hardness of the region near the specimen surface had a large effect on fatigue behavior.