Fracture reason of GCr15 steel bushing

The fracture reason of GCr15 steel bushing was analyzed by means of macroscopic observation, chemical composition analysis, scanning electron microscope and energy spectrum analysis, metallographic examination, and microhardness test. The results show that the fracture of the bushing was characterized by brittle fracture, and there were early cracks at the starting position of the fracture. Due to improper grinding process, grinding burn occured on the end face of the bushing, and the surface hardness of the bushing decreased.