Fatigue Limit Improvement and Rendering Surface Defects Harmless by Shot Peening for Carburized Steel

Remanufacturing has become popular as a system for reducing CO2 emissions caused by the life cycle of products. Therefore, producing more components via remanufacturing is important. Shot peening can be used to render surface defects harmless owing compressive residual stress effects. This study investigated effects shot means gears. In this study, carburized steel specimens containing artificial were investigate on fatigue strength; defect size was rendered peening. conducted after inducing semicircular slits with depths = 0.15, 0.20, and 0.30 mm. Subsequently, plane bending tests carried out. A maximum 1400 MPa induced The limit smooth specimen increased approximately 31% slit at least 0.20 mm deep could (SP). reduced SP evaluated basis fracture mechanics. estimated results are consistent experimental results. On results, feasibility method gears discussed.