Effect of laser peening with different power densities on vibration fatigue resistance of hydrogenated TC4 titanium alloy

Laser peening process introduces high level of compressive residual stress and beneficial microstructures (dislocations, dislocation cells, dislocation walls, dislocation entanglements) in the superficial layer of treated TC4 alloy, and effectively inhibiting the initiation and propagation of hydrogen-induced cracks.