Fatigue Strength and Fracture Mechanism of Ceramic-Sprayed Steel.

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  • セラミック溶射材の疲労強度と破壊機構
  • セラミック ヨウシャザイ ノ ヒロウ キョウド ト ハカイ キコウ

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Abstract

In order to investigate the fatigue strength and fracture mechanism of ceramic-sprayed steel, rotating bending fatigue tests have been conducted at room temperature using specimens of medium carbon steel (S 45 C) with sprayed chromia coating. The results obtained were discussed based on detailed observation of fatigue cracks and on the experimental fatigue data on specimens subjected to individual treatment during the ceramic spraying process. It was found that at an extremely early stage of fatigue, fatigue cracks were initiated at the interface between under-and top-coated layers, and then grew rapidly into the ceramic-sprayed layer. However, these cracks did not propagate continuously into the substrate, and the final failure was led by the growth of a crack newly initiated at the surface of the substrate steel. Therefore, it was concluded that the fatigue strength of the ceramic-sprayed steel could be evaluated to be due to the property of the substrate.

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