13th International Conference on Fracture June 16–21, 2013, Beijing, China -3- In the case of SWOSC-V steel, the material was oil-quenched at 1123K(850deg.C)/20min and then it was tempered at each of 668K(395deg.C)/60min and 636K (363deg.C)/60min, respectively. Some of 363deg.C-tempered specimens were electrochemically polished, and some of them were shot-peened. In order to distinguish the respective series, notations such as “T-395G series”, “T-363G series”, “T-363EP series” and “T-363SP series”, were introduced similar to the case of SUP7 steel. Preparation process of the respective series for SWOSC-V steel is given in a flowchart in Fig.2. Figure 2. Flowchart of specimen preparation for SWOSC-V steel (a) Rotating bending (SUP7) (b) Axial loading Figure 3. Shape and dimensions of fatigue specimens Quenching 850℃×20min, Oil cooling Tempering 395℃×60min Tempering 363℃×60min Grinding Electropolishing Shot-peening T-395G T-363G T-363EP T-363SP
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