Effects of laser peening on rotating bending fatigue properties of Ti-6Al-4V titanium alloy

Masaki, Kiyotaka*; Kameshima, Yohei*; Hisamori, Noriyuki*; Sano, Yuji*; Akita, Koichi; Shobu, Takahisa

Zairyo, 62(5), p.297 - 304, 2013/05

https://doi.org/10.2472/jsms.62.297

Effects of laser peening without protective coating (LPwC) for high cycle fatigue property on + type Ti-6Al-4V alloy were investigated. As the results of peening effect investigation, it was clear that the surface layer was slightly hardened and high level compressive residual stress was induced near the surface by the LPwC treatment. However, the fatigue property was not improved by the LPwC treatment on the condition. One of the reasons was thought notch effects by surface roughness, then fatigue tests with surface polished LPwC specimen were carried out. However, the fatigue life of polished LPwC specimen was shorter than that of LPwC specimen unexpectedly.