The Effect Of Surface Treatment On The Fatigue Strength Of SUS316L Additive Manufactured Products

Rotating bending fatigue tests were conducted to investigate the effect of shot peening and barrel finishing on fatigue properties of SUS316L made by laser PBF which was one of additive manufacturing processes. Surface roughness, residual stress, and fatigue strength were investigated for each specimen. As a result, the fatigue strength of the barrel finished specimens was almost same or better than that of the shot peened specimens. Barrel finished specimens increased 4.1 times higher fatigue strength than as-built specimens. The surface roughness of the specimens after barrel finishing was reduced by up to 96% compared to the as-built specimens. On the other hand, the surface roughness of the specimens after shot peening was reduced by up to 68% compared to the as-built specimens. The increase in compressive residual stress was almost equal to each specimen. Therefore, shot peening and barrel finishing drastically affects to increase the fatigue strength of additive manufactured material.