Abstract: Induction heating and quenching process for 45 steel forging wheel was studied by simultaneous heating mode and continuous heating mode, respectively. The results show that when using continuous heating (the gap between the inductor and the workpiece is 6 mm, the output power is 339 kW, and the frequency is 6.3 kHz) with spray water cooling, and then tempered at 230 ℃ for 2 h in a heat treatment furnace, the surface hardness of the wheel outer surface tread and fillet area is 509-599 HV0.2 (50-55 HRC), the depth of the hardened layer is 3.4-4.7 mm, and the microstructure grade is 5-7, which can all meet the technical requirements of the wheel, and acquires good results in industrial pilot production.

Key words: wheel, steel forging, quenching mode, hardened layer, microhardness, microstructure