2025 高炭素クロム軸受鋼Gcr15の超高サイクル疲労特性(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 investigate the fatigue properties in very high cycle fatigue regime of high strength steel, cantilever-type rotary bending fatigue test was carried out using the hour-glass shaped round-bar specimen of high carbon chromium bearing steel, GB Gcr15(Chinese standard) in an open environment at room temperature. As a result, the S-N curve was classified into surface inclusion induced fracture mode, subsurface inclusion without GBF area induced fracture mode and subsurface inclusion with GBF area induced fracture mode. Formation of a GBF area was clearly observed in the vicinity of subsurface inclusion on the fracture surface ruptured at high-cycle fatigue regime. The roughness on GBF area was same as the size of carbide particle in the matrix and the high density of carbon was detected on the GBF area by EPMA. The FRASTA simulation showed that multiple dispersive micro-cracks formed around the inclusion and coalesced each other to form the GBF area.
2007-09-07