| Title |
Effects of Shot - Peening on the Fatigue Properties of 300M Steel |
| Authors |
신성호(Sung Ho Shin),류지호(Ji Ho Ryu),고정(Jeong Ko),윤용구(Yong Gu Yun),박주승(Joo Seung Park) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Abstract |
Effects of shot peening on the residual stresses and fatigue properties of 300M steel were studied. The fatigue strength was enhanced by 90 ㎫ and the fatigue life was improved approximately by 800% with the shot peening at 24 amp. of impeller current for 2 min. Excessive shot peening caused surface defects and reduced the improvement of fatigue properties. The fatigue crack initiation site was found to move to subsurface mainly near non-metallic inclusions, with the increase of shot peening intensity and residual stress, but the defects on the surface was dominant crack initiation site in the excessively shot-peened specimen. The mechanism of improvement in fatigue properties in case of the subsurface fatigue crack initiation was discussed. |