Abstract
Since pin portion such as crankshaft is required wear resistance, generally that is locally induction hardened. However, it is pointed out that tensile residual stress in hardened boundary would be affecting to initiation of fatigue crack and fracture. In this study, influence of induction hardening conditions on tensile residual stress distribution in hardened boundary have been discussed. As a result, it is considered that tensile residual stress takes place by heat stress and is influenced by internal material temperature (material strength) during cooling.
