Effect of Ceramic Shot Peening on Fatigue Properties of TC18 TitaniumAlloy by Laser Additive Manufacturing

Ceramic shot peening was performed on TC18 titanium alloy formed by laser additive manufacturing, and effects of shot peening intensity on the surface morphology, surface roughness, surface residual compressive stress, hardness and fatigue properties were studied. The results show that with the increase of shot peening intensity, the alloy surface processing traces gradually disappeared, but the craters became obvious, and the surface roughness and residual compressive stress increased. Shot peening improved the hardness and elastic modulus of the alloy. As the shot peening intensity increased, the fatigue life of the alloy increased first and then decreased, and the fatigue cracks source first transferred to the inside from the surface of the material and then returned to the surface. The fatigue life of the sample with 0.20-0.25 mm shot peening intensity was the highest.