Abstract
Three-point bending ultrasonic fatigue tests were performed on forged TC4 titanium alloy with different laser shock peening treatments. The results show that HCF properties are improved, while VHCF properties deteriorate after 4.6 J impact for 3 times. The fatigue fracture shows a transgranular quasi-cleavage mode with facets on the surface or subsurface, which are caused by cleavage and slip of αp grains, and laser shock peening causes the crack origin zone to shift sideways. Residual compressive stress and surface nanocrystals have a combined fatigue strengthening effect, while excessive grain refinement and subsurface failure mechanism weakens the fatigue properties.
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