Study on Fatigue Fracture of Laminated Inhomogeneous Metals : In Quenched Clad Plates of Low Carbon Steel and Middle Carbon Steel

概要

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Quenched clad plates of low carbon steel and middle carbon steel were made as models of the laminated inhomogeneous metals such as induction hardened steels and carburized hardened steels. By using these clad plates, effects of the initial residual stress and the laminated inhomogeneity on the fatigue fracture were discussed. Main results obtained are as follows: The initial residual stress resulted in causing only the mean strain for the hysteresis loop, so that the fatigue lives of the clad plates were little influenced of the hardened layer-elasticity and softened layer-plasticity. Considering the slip deformation in biaxial stress of the low carbon steel layer, the estimated fatigue lives fairly well agreed with the S-N curves except in the vicinity of the fatigue limit of the clad plates.
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