高強度鋼の高サイクル疲労における破壊モード遷移について

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タイトル別名
  • Fracture Mode Transition in High Cycle Fatigue of High Strength Steel.
  • コウ キョウド コウ ノ コウ サイクル ヒロウ ニ オケル ハカイ モード

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Rotating bending fatigue tests were carried out on quenched and low temperature tempered SAE 9254 spring steels having two kinds of microstructure in which either isolated defects (retained ferrite) or connected defects (proeutectoid ferrite) are dispersed, with a special interest in the transition of surface to subsurface fracture known as "Fish-eye fracture" in high strength steel. Discussions were made of the relationship between the fatigue fracture mode transition and the surface conditions, and also of the role of the microstructure in the formation of the Fish-eye pattern. Results show that (1) the fracture mode transition occurs in the material having isolated defects in the microstructure when a surface fracture mode is prevented by strengthening the surface layer with mechanical polishing and, (2) such a fracture mode transition is associated with the change in fatigue crack initiation process from slip band cracking of surface retained ferrite to cleavage cracking of internal retained ferrite.

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