W6Mo5Cr4V2 steel was implanted with N + ions.The
friction and wear behavior of the
surface modified layer on the steel
surface was examined on a pin on disc friction and wear tester.The phase composition,depth profile of N through the modified layer,and the wear mechanisms of the surface modified layer were investigated by means of scanning electron microscopy,Auger electron spectroscopy,X ray diffraction, and X ray photoelectron spectroscopy.The results show that ion implantation of the steel with N + ions leads to considerable changes in the physical and mechanical properties as well as the chemical states of the
surface modified layer.Thus finely dispersed hard secondary phase particles including ε Fe 2 3 N, CrN, and β Cr 2N were generated on the steel surface after ion implantation. The strengthening effect of the secondary phases and of the related eutectoids leads to the decreases in surface roughness and increases in surface micro hardness and compressive stress. Subsequently a greatly improved
friction and wear behavior of the surface modified layer is reached.Moreover, the improvement degree of the friction and wear behavior of the surface modified layer is highly dependent on the ion implantation parameters. The orthogonal analytical result indicates hat the optimal friction and wear behavior of the surface modified layer is reached at an ion implantation dose of 4×10 17 ions/cm 2 and energy of 100 keV.