2028 SCM435鋼の超高サイクル回転曲げ疲労特性に対する焼戻し温度の影響(S11-1 高強度鋼・高硬度鋼の超高サイクル疲労,S11 金属材料の超高サイクル疲労特性の解明)

概要

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In order to clarify the appearing aspect of duplex S-N property with respect to the strength level, we prepared a lot of SCM435 steel specimens with 5 different strength levels by changing the tempering temperature. Fatigue tests in gigacycle regime were performed in rotating bending for those specimens with respective strength levels. Thus, it was found that the duplex S-N property consisting of the respective fracture modes of the surface-induced fracture and the interior defect-induced fracture appeared depending on the strength level of this steel. Based on this long life fatigue property, one can design mechanical structures in the very long service life such as gigacycles. This kind of design provides us a drastic saving of materials and energy required to the material production together with the reduction of the environmental load.
2007-09-07