Abstract
A 3D-FEM simulation program for induction hardening of S35C steel was made up. An electromagnetic field analysis, a heat conduction analysis and an elastic-plastic stress analysis during the induction hardening process of S35C steel gear were carried out by using this program, considering changes of the magnetic permeability, the resistivity, the thermal expansion coefficient and the yield stress with the temperature, and then residual stresses and hardened layers were obtained. Calculated temperatures during induction heating process and hardened layer were compared with measured temperatures and hardened layer. On the basis of these results, the validity of this computation program was confirmed.
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