Effect of microstructure and induction processing on fatigue performance and crack initiation of induction hardened bar steel
Induction hardened components rely heavily on both the hard martensite formed in the case during processing and the corresponding compressive residual stresses to improve fatigue performance of a component. In this study, 1045, 4145, and 1060 steel alloys were characterized and fatigue tested with cantilever bending in the as hot-rolled, normalized, or quenched and tempered conditions. The alloys were induction hardened to achieve either "low" or "high" case depths. Post-induction hardening characterization included residual stress depth profiles, microhardness traverses, and microstructure ...
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