Fatigue Fracture Mechanism Of Zirconia Shot Peened Ti–6Al–4V Alloy

Author:  Kiyotaka Masaki, Noriyuki Hisamori, Yuji Kobayashi, and Daisuke Gowa
Source:  ICSP-13
Doc ID:  2017037
Year of Publication:  2017
Abstract:  
Introduction: Ti–6Al–4V is the most popular titanium alloy. It is used for aerospace industrial components and biomedical materials because of its high tensile strength at high temperatures and high corrosion resistance. In many cases, industrial components are subjected to cyclic loadings when they are used. Therefore, improvement in high cycle fatigue properties is essential to enhance the reliability of the components. We have been attempting to improve the high cycle fatigue properties by zirconia shot peening treatment of Ti–6Al–4V. At the 12th International Conference on Shot Peening,we reported that zirconia shot peening could extend the rotating bending fatigue life of Ti–6Al–4V, but could not improve the fatigue strength for a high cycle regime. We indicated that changes in the fatigue property resulted from the residual stresses that arose from the treatment. In this study, the effects of the shot peening treatment on pulsating tensile axial loading fatigue and its fracture mechanism were investigated.