| Title |
A Study on the Prediction of Bending Fatigue Life with Varying the Ni contents in Type 304 Stainless Steel Sheets |
| Authors |
유도열(Do Yeal Ryoo); 이수찬(Soo Chan Lee); 강정윤(Jung Yoon Kang) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
Type 304 austenitic stainless steel; Nickel contents; Bending fatigue life; Prediction of bending fatigue life; Cryogenic temperature |
| Abstract |
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) |