MECHANICAL PROPERTIES AND EDDY CURRENTS IN 20CrMo5 LOW –TEMPERATURE TEMPERING OF VARIOUS DURATIONS
- 1 “M+S Hydraulic”AD Kazanlak, Bulgaria
The subject of our study is the effect of the tempering duration /for up to 7 hours, at 180°C/ on the mechanical properties of 20CrMo5 quenched steel samples. Possibilities were studied, including through eddy currents, to control the final tempering of parts which have gone through carburizing, double-quenching and interim high-temperature tempering. The parts were 20CrMo5 steel shafts, which had their carburized layer removed in certain zones before the thread was made.
It has been established that a strong correlation exists between the HV50 quality indices and the eddy currents characteristic Z.