Structural Change during the Fatigue Process of High Hardened Steel

概要

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In order to obtain some knowledge about the fatigue mechanism of high hardness materials, fatigue tests and microscopic observations were carried out of four kinds of induction hardened steels. It was found that a structural change took place on these specimens surfaces during the fatigue process, which was quite different from the slip as observed in ductile materials and was essentially unknown. It was established that this structural change was closely related to crack formation and the fatigue fracture of an induction hardened low carbon steel took place as a consequence of the propagation and joining up of the micro cracks induced by the structural change. In this report the mechanism of fatigue crack formation associated with the structural change is discussed by assuming that the structural change may occur as a result of carbide precipitation on the prior austenitic grain boundary, although the reason why the structural change takes place is not clear.
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