Abstract
This chapter discusses the state of the art of induction-hardening technology and subjects associated with it. Basic and advance theoretical principles related to three modes of induction hardening (surface, through, and selective hardening) are reviewed. The chapter also covers the effect of physical properties on electromagnetic and thermal processes, as well as the effect of prior microstructure and heat intensity on the results of hardening. Also discussed are coil designs and fabrication, together with the specifics of single-shot, progressive, scanning, and specialty inductors. Myths, realities, and common misconceptions regarding the use of magnetic flux concentrators are also examined. The limitations of generalized all-purpose commercial software, as well as the subtleties of numerical computer simulation of induction-hardening processes, are assessed using various case studies as examples. Comparative analysis of traditional and recently developed novel processes related to induction surface hardening of crankshafts, camshafts, gears, and other critical components are provided here as well. The chapter provides a comparison of the different types of semiconductor power supplies used for induction hardening and describes load matching principles and the circuitry of different styles of power supplies.
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