Effects of Low Energy Pulse Current on Friction and Wear Properties of Quenched and Tempered GCr15 Steel
The effects of the electropulsing treatment at near room temperature on the microhardness and tribological properties of quenched and tempered GCr15 bearing steel were investigated.The microstructures of specimens before and after pulse treatment were characterized by optical microscope(OM)and X-ray diffraction technique(XRD).The influence of peak current density of electropulsing treatment on the microhardness and tribological properties of the samples and the influence of microstructure change on the microhardness and tribological properties of the sample after electropulsing treatment were discussed.The results show that with the increase of peak current density,the microhardness of samples decreases,and the wear resistance increases first and then decreases.Compared with the untreated sample,when the peak current density is 130 A/mm2,the friction coefficient of GCr15 bearing steel decreases from 2.08×10-5 N-1·m-1 to 1.67×10-5 N-1·m-1,and the wear resistance is the best.It indicates that electropulsing treatment can promote the secondary tempering of GCr15 sample in a very short time and the tempering degree increases with the increase of current density,which causes carbon precipitation from supersaturated martensite and the formation of fine carbide,then the friction and wear properties of GCr15 bearing steel are improved.
electropulsing treatmentGCr15 steelmi-crohardnessfriction and wear properties
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