| 摘要 |
PROBLEM TO BE SOLVED: To provide high strength machine parts having a notched part with the radius of curvature of≤25 mm and further having a surface HV hardness of≥250, and to provide a method for improving its fatigue strength. SOLUTION: Regarding the high strength machine parts having excellent fatigue strength, in machine parts having a composition of, by mass, 0.1 to 1.2% C, and the balance Fe with inevitable impurities, and having a notched part with the radius of curvature of≤25 mm, the HV hardness of the surface is≥250, and further, the compressive residual stress of the surface layer in the notched part is -100 to -1,500 MPa, and to provide a method for improving its fatigue strength. COPYRIGHT: (C)2006,JPO&NCIPI
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