쇼트 볼의 크기에 따르는 SCM822H 강의 무해화 균열크기 평가 = Evaluation of Harmless Crack Size of SCM822H Steel according to Shot Ball Size

다국어 초록 (Multilingual Abstract)

In this study, the harmless crack size was evaluated using carburized, quenched- tempered SCM822H steel. The possibility of detecting cracks that reduce the fatigue limit by non-destructive inspection was evaluated. The conclusions obtained are as follows. The retained austenite of surface was reduced by SP. About 35% and 65% of the retained austenite on the surface were transformed into strain-induced martensite, increasing the hardness by 79HV and 122HV over the as-received material. The maximum compressive residual stresses introduced on the surfaces were -695 MPa and -688 MPa, respectively. The fatigue limit increased by 1.48 times and 1.67 times, respectively, compared to the as-received material. The harmless crack size of SP specimen was determined differently depending on the shot ball size.