Effect of ultrasonic surface rolling process by disparate static pressure on a carburized layer of 17CrNiMo6 steel

Considering the elevated application requirements for transmission gears in terms of wear and corrosion resistance, this study investigates the impact of different static pressures (0.4 MPa, 0.6 MPa, 0.8 MPa) on the structure and protective properties of vacuum-carburized USRP layers, leveraging the technical advantages offered by vacuum carburizing and USRP. The findings demonstrate that using USRP facilitates fine-grained strengthening, and the thickness of the grain refinement layer increases proportionally with static pressure. The 0.6 MPa static pressure exhibits the most pronounced positive impact on grain refinement. The application of varying static pressures results in different surface integrity and microhardness levels within the carburized layer, thereby impacting the layer's wear and corrosion resistance. The coating exhibits the highest hardness and lowest roughness at a static pressure of 0.6 MPa, thereby demonstrating superior wear resistance. In addition, the 0.6 MPa layer with the lowest roughness has the best corrosion resistance.