12.16 - Microstructures and Mechanical Performance of Induction-Hardened Medium-Carbon Steels

Abstract

Induction hardening is an efficient method of surface or through hardening components without changing the composition. As with other alloys and processes, it is critical to understand induction processing–microstructure–mechanical behavior relationships. This chapter, which focuses on surface hardening, first presents important and practical information on the effect of induction-processing parameters on surface hardening. Then, microstructural evolution during induction processing is discussed in light of the rapid heating rates and short hold times and compared to furnace heat treatments. The resulting microstructures and residual stresses after induction hardening are presented, and finally, the induction-hardened case depth, microstructure, and residual stresses are related to strength and fatigue properties.