2026 高速度工具鋼SKH51の高サイクルねじり疲労強度特性(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 torsional fatigue behavior in high-cycle fatigue regime, repeated torsional fatigue test was carried out using a hour-glass shaped specimen of high speed tool steel, JIS SKH51, in air at room temperature. From the experimental results, two types of fracture modes were existed on the S-N curve, that is, surface inclusion-induced fracture mode in high-stress amplitude and short fatigue life region and subsurface inclusion induced fracture mode in low-stress amplitude and long fatigue life region. The fatigue strength ratio of torsional fatigue to axial loading fatigue at 10^7 cycles was 0.60. The GBF area observed in the vicinity of a subsurface inclusion in axial loading fatigue was not identified on the fracture surface in repeated torsional fatigue test below 10^7 cycles, but it was expected to generate it in more long fatigue life regime.
2007-09-07