Residual Stress Characteristic of the Induction Hardened Steel

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The heat-treated materials have residual strains both micro and macro coexisting in them. The residual stress must generally be measured either by the X-ray method or by the cutting method with the use of a wire strain gage. It is necessary that the mutual relation of the residual stresses respectively obtained by these two methods will be made clear. There are but few data, however, as have so far been hitherto collected with this requirement in view, about the property of residual stress of heat-treated materials. A report is presented in this paper of the measurement of the residual stress variation on the surface of the induction hardened steel, both by the X-ray method and also by the cutting method with the use of the strain gage.It has consequently been made evident that there is complicated mutual relation between the macro residual stress and the micro residual strain, and that the difference in the residual stress value when the stress is measured by the X-ray method from what it is when the stress is measured by the cutting method with the use of the strain gage comes from the micro residual strain. The effect of the difference is remarkable when there is larger macro residual stress. When the residual stress value of the induction hardened materials is measured by the X-ray method, it is important that the effect of the micro strain variation on the macro residual stress will be taken into consideration.