Effect of induction heating temperature on microstructure and mechanical properties of S55C steel for ball screw
In order to optimize the process parameters of induction hardening and improve the surface hardness and mechanical properties of ball screw, the induction hardening process of S55C steel for ball screw was studied. The S55C steel sample for ball screw was treated by induction hardening witha self-designed induction heating tool. The microstructure of the sample was characterized by an optical microscope and scanning electron microscope. The influence of heating temperature on microstructure, microhardness and fracture morphology was analyzed by tensile test, metallographic test and microhardness test. The results show that when the sample is heated to about 960℃ under oil cooling, the microstructure is uniform fine martensite, the Vickershardness is about 750 , and the tensile strength is about 1200 MPa. When the sample is heated to about 860℃ under water cooling, the microstructure is uniform fine martensite, the Vickers hardness is about 800 , and the tensile strength is about 780 MPa. Both oil-cooled and water-cooled specimens exhibit brittle fracture patterns when stretchedat room temperature, while oil-cooled specimens exhibit cleavage fracture characteristics, and water-cooled specimens exhibit more obvious intergranular fracture characteristics with obvious rock sugar fracture morphology. The research results can provide a theoretical basis and technical guidance for the design of the induction hardening process of S55C ball screw.
万方数据
维普
