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Type 304 스테인리스 강판의 Ni 함량 변화에 따른 굽힘 피로수명 예측에 관한 연구
유도열,이수찬,강정윤 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.7
The prediction of bending fatigue life was carried out for Type 304 stainless steel sheets containing various nickel contents from 8.3 up to 12 wt.%. After the slopes of the elastic strain (Δε_(e)/2) and the plastic strain (Δε_(p)/2) lines were obtained by the tensile test and bending fatigue test data at room and cryogenic temperatures, the prediction equations for the bending fatigue life were made by using the method of universal slope. At the ranges above 10³ Cycles, the predicted equations showed higher bending fatigue life same as measured one with lowering the nickel contents in the range of 8.3-12 wt. %. But, at the ranges below 10³ Cycles, the predictions of low-cycle bending fatigue life varying the nickel contents were different from the measured ones. A limitation was encountered for the prediction of the bending fatigue life with using the tensile data. In order to increase the reliability of the prediction equations at the ranges below 10³ Cycles, it is necessary to take into account the behavior of the α'-martensite transformation during fatigue affecting the generation and propagation of fatigue cracks. (Received March 8, 2004)