발간논문

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Vol.28, No.7, 634 ~ 640, 1990
Title
Effect of Non - Metallic Inclusions on the Fatigue bahavior in High C - Cr Bearing Steel
윤복용Bock Yong Yoon, 최병영Byung Young Choi
Abstract
The effect of type, size and quantity of non-metalic inclusions on the fatigue behavior of high C-Cr bearing steel during thrust-type rolling contact fatigue have been investigated. It was observed that elongated MnS inclusions, fragmented stringers of angular Al₂O₃inclusions and AI₂O₃-MnS duplex inclusions were distributed along the direction of working. ASTM A 295-84 SAM method was more suitable for assessing non- metallic inclusions to estimate fatigue life of high C-Cr bearing steel than Fairey method. Fatigue life decreased with the content of Al₂O₃inclusions. It was also observed in the region below flaking that fatigue crack was initiated by debonding of large AI₂O₃inclusion from matrix whereas void formed around small Al₂O₃inclusion
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