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.