Effect of High-Frequency Quenching Power on Surface Microstructure and Friction and Wear Properties of 35CrMo Steel

The surface quenching of 35CrMo steel was carried out by high-frequency quenching under different powers (2.5, 3.0, 3.5, 4.0, 4.5 kW). The effects of quenching power on the surface microstructure, hardness, friction and wear properties and wear mechanism of 35CrMo steel were studied. The results show that when the quenching power was 2.5 kW, the test steel surface was mainly composed of pearlite and had the lowest hardness of 532 HV, the stable friction factor of 0.58, and the largest wear rate of 14.58 μm³·N^-1·mm^-1. When the quenching power was 3.0 kW, the surface was mainly composed of granular bainite and had the highest surface hardness of 604 HV, the lowest stable friction factor of 0.47 and the lowest wear rate of 10.15 μm³·N^-1·mm^-1. With the continuous increasing of quenching power, granular bainite gradually transformed into upward bainite, lower bainite and carbon-free bainite, the surface hardness decreased, and the friction coefficient and wear rate increased as a whole. When the quenching power was 2.5, 3.0, 3.5, 4.0 kW, the wear mechanism was mainly abrasive wear and accompanied by local adhesive wear and oxidation wear. When the quenching power was 4.5 kW, the wear mechanism was mainly adhesive wear and accompanied by local abrasive wear and oxidation wear.