２단 쇼트 피닝한 침탄 질화강의 피로한도 및 균열 무해화 크기 평가에 관한 연구 (Study on the Evaluation of Fatigue Limit and Harmless Crack Size of Double Shot Peening Treated Carbonitriding Steel)

서지정보

· 발행기관 : 한국산업융합학회
· 수록지 정보 : 한국산업융합학회논문집 / 27권 / 6호 / 1449 ~ 1456페이지
· 저자명 : 이정규, 윤서현

초록

Recently, a technique has been developed to harmlessly treat surface microcrack through surface modification. This technique has the advantage of increasing fatigue life by harmlessly treating surface microcrack that occur during machining and operation. In this study, to prevent a decrease in the fatigue limit of carbonitriding products, specimens were produced by performing a double shot peening (DSP) after tempering at 573K. Using the compressive residual stress due to DSP, the harmless crack size was calculated. The specimens tempered at 573K showed little change in surface properties even when the temperature increased during operation. The surface hardness of the specimens tempered at 573K after DSP was lower due to the phase transformation occurring during the DSP and 573K tempering process. The specimens subjected to DSP after 573K tempering exhibited higher maximum compressive residual stress and fatigue limit. The crack size that could be rendered harmless was derived from the residual stress of the carbonitriding steel.

영어초록

Recently, a technique has been developed to harmlessly treat surface microcrack through surface modification. This technique has the advantage of increasing fatigue life by harmlessly treating surface microcrack that occur during machining and operation. In this study, to prevent a decrease in the fatigue limit of carbonitriding products, specimens were produced by performing a double shot peening (DSP) after tempering at 573K. Using the compressive residual stress due to DSP, the harmless crack size was calculated. The specimens tempered at 573K showed little change in surface properties even when the temperature increased during operation. The surface hardness of the specimens tempered at 573K after DSP was lower due to the phase transformation occurring during the DSP and 573K tempering process. The specimens subjected to DSP after 573K tempering exhibited higher maximum compressive residual stress and fatigue limit. The crack size that could be rendered harmless was derived from the residual stress of the carbonitriding steel.

참고자료

· 없음