Single-frequency induction hardening of structural steel

Abstract

Purpose: Current paper presents investigation of specimens after single frequency induction hardening process. The main aim is to compare microstructure of the material after the process conducted with different voltage on the induction coil. Moreover, two different steel grades are used for comparative reasons. As the final result it is desired to obtain sufficient parameters for the process in aim to obtain proper surface treatment of the material. Design/methodology/approach: The objectives of the research are achieved by using single-frequency induction hardening device with varying voltage. Two different steel grades were treated with change of the induction voltage from 300 to 600 V. Findings: In the outcomes of the study, the main conclusion is that there is an impact of the induction voltage in the hardening process on the microstructure of treated elements, both for 40H41Cr4 and 40HNMA36NiCrMo16 steels. Research limitations/implications: Obtained results will be used for much more complex investigation of the induction hardening process in future to introduce more exact parameters and double-frequency induction hardening process for complex geometries as gears. Originality/value: The originality of the research is based on the specific process and the materials that are being submitted to the comparative analysis. Moreover, executed research will be a basis for more complex induction hardening processes in the future.