Investigation of laser shock peening effects on residual stress state and fatigue performance of titanium alloys

► Effect of laser peening without coating (LPwC) on fatigue life of Ti alloys was studied. ► High cycle fatigue life was prolonged in Ti-2.5Cu and LCB and deteriorated in Ti-54M. ► Results were mainly interpreted by residual stresses and surface morphology. ► Residual stress is thermally more stable after LPwC than that after shot peeing. ► Surface vaporization due to LPwC results in very rough surface.