Abstract
Laser peening (LP) with different coverage areas was carried out on Ti–6Al–4V titanium alloy specimens. Residual stresses, fatigue lives and fracture morphologies of specimens subjected to LP were analyzed. The LP-induced compressive residual stresses under different coverage areas were revealed in the superficial layer. The results show that LP coverage area has significant effect on fatigue response and fracture behavior. The decreased fatigue striation spacing and increased dislocations observed in the treated specimens further confirmed the effect of LP on decelerating fatigue crack growth (FCG). In addition, the strengthening mechanism of LP-induced compressive residual stress and surface nanocrystallization was theoretically investigated.
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