Influence Of Ion Implantation Process Of Elevated Temperature On Structure And Properties Of Nitrogen Implanted Steel Surface

In this paper, the influence of the nitrogen ion implantation technique at elevatedtemperature on the steel, such as the surface morphology, phase composition, mechnicaland tribological properties were studied. The results as followed were found:(1) According to the study of the various nitrogen ion implantation process, the effectof temperature rise on4135steel and H13steel can be cotroled by intermittent ionimplantation and decreasing the ion beam current.(2) The uneven microstructure in the M2steel has significant effect on nitrogen ionimplantation at elevated temperature. In the various nitrogen ion implantaeion techniqueparameters, the microhardness and the concertation of the nitrogen of the alloyingelemental concentrated area is higher than that of the alloying elemental distributed area. Itis founded that the modified layers of the alloying elemental concentrated area is thickerthan that of the alloying elemental distributed area.(3) The Fe4N phase formed in the surface region of4135steel. At the same load, thehardness of the samples with nitrogen implantation at elevated temperature is higher thanthe substrate. The AES depth profiles in4135steel implanted with nitrogen at elevatedtemperature show that the nitrogen penetration depth is increased with the implantationdoses, but the peak concertration of nitrogen are similar. Under lubricated conditions, withthe increacing of the implantation doses, the friction coefficient and the wear rate of thesamples can be obviously reduced, the friction-reduction and wear-resistant properties havebeen significantly enhanced.(4) The AES depth profiles in H13steel implanted with nitrogen at elevatedtemperature show that the nitrogen penetration depth and the peak concertration ofnitrogen is increased with the implantation doses. It was found that a clear nitrogendiffusion in the samples. At the same load, the hardness of the samples with nitrogenimplantation at elevated temperature is higher than the substrate. This may be due mainlyto implanting nitrogen solid solution strengthening. Under lubricated conditions, thefriction coefficient and the wear rate of the samples are lower than that of the substrate.With the increacing of the implantation doses, the wear rate of the samples can be obviously reduced, the wear-resistant property has been significantly enhanced. Thefriction coefficient of the samples with nitrogen implanted are similar with the increasingof the implantation doses. It has no effect on the riction-reduction property.