Residual Stress and Hardened Layer of Roller Due to Induction Hardening

Abstract

An electromagnetic field analysis, a heat conduction analysis and an elastic-plastic stress analysis during the induction hardening process of S35C steel rollers were carried out for various hardening conditions by using FEM program developed by authors, considering changes of the magnetic permeability, the resistivity, the thermal expansion coefficient and the yield stress with the temperature. Effects of the electric power and the frequency on the residual stress and the hardened layer of roller due to the induction hardening were examined. The measurement of hardness distribution of induction hardened rollers was performed, and measured hardened layers were compared with calculated ones.