| 摘要 |
PURPOSE:To improve remarkably the fatigue strength of a carburized and hardened member having a notch by subjecting the member to physical working after carburization and hardening. CONSTITUTION:A member having a notch is carburized and hardened, and the surface of the notch is mechanically worked to remove an abnormal surface layer formed by the carburization and hardening. At the same time, martensite is hardened by cutting pressure, the transformation of retained austenite is induced, and residual compressive stress id applied to the surface and a part under the surface. In addition, a hyperfine-grained layer of 10-30mum is formed on the mechanically worked surface. |
