Abstract
Rotating bending fatigue tests were performed for a high carbon-chromium steel in order to clarify the influence of radical nitriding on fatigue strength and fracture mechanism in the life region where a fish-eye fracture occurs. It was found that crack intiation originated from slips or surface defects under high stress levels and from internal defects under low stress levels in the both quenched and tempered steel and nitrided steel. However, fatigue life in the fish-eye fracture region was extremely shorter in the nitrided steel than in the quenched and tempered steel. Around the non-metallic inclusion of fish-eye, granular facets were observed in the quenched and tempered steel but in the nitrided steel featureless facets generated. Macroscopic examination of fish-eye fracture surfaces also showed that in the quenched and tempered steel, a crack propagated radically with a start at fish-eye, but in the nitrided steel it grew rapidly within diffusion layer and then extended internally from the whole diffusion layer to form a ring-shaped fracture surface.
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