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J. Ocean Eng. Technol. 2001;15(4):66-72.    

Effect of Shot Peening on Fatigue Strength of JISG4081SUP7-DIN50CrV4 Steel
JISG4081SUP7-DIN50CrV4강의 피로강도에 미치는 쇼트피이닝의 영향
박경동,정찬기
부경대학교 기계공학부,부경대학교 대학원 기계공학부
© 2001 The Korean Society of Ocean Engineers     Open access / Under a Creative Commons License
Keywords: Shot peening, Residual stress, Rotary bending, Fatigue strong, Wirerod, Fatigue life
핵심용어: 쇼트 피이닝, 잔류응력, 회전굽힘, 피로강도, 와이어로드, 피로수명
Abstract
Recently the steel parts used at automobiles are required to be used under high stress more than ever before in need of the weight down. To achieve this requirement of a high strength steel, it must be necessary to decrease inclusion content and surface defect as like decarburization, surface roughness etc.. In this study, the surface conditions are measured to know the influence on fatigue properties by two cases of shot peening of two-stage shot peening and single-stage shot peening. And for this study, two kinds of spring steel (JISG4081SUP7, DIN 50CrV4) are used. This study shows the outstanding improvement of fatigue properties at the case of two-stage shot peening in the rotary bending fatigue test and this is assumed to be from on low stress condition, the 1st stage shot peening is not affected by nonmetallic inclusion under metal. it is possible that the 2nd stage shot peening increases the fatigue life and the high stress but that is affected by nonmetallic inclusion under metal. so far beeasily DIN50CrV4 have made high stress. But, results also show fatigue failures originated at inclusion near surface, and this inclusion type is turned out to be a alumina of high hardness.


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