Abstract
The structure and phase composition of the nitrided layers of steel 40X13 received by intensive low-energy ion implantation of nitrogen and combined effect of ultrasonic burnishing and implantation are investigated by optical metallography, X-ray analysis and durometer. It is shown that ion implantation of nitrogen in steel 40X13 forms nitride hardened surface layer. Structure and phase composition of this layer depend on implantation temperature and the initial structure. After implantation at 350 °С nitrided layer is a diffusion zone containing nitrogen martensite and nitride particles. As a result of implantation at temperature 400 °С formed nitrided layer consists of nitride and diffusion zone. As a result of implantation at 450 °С and 500 °С chromium nitride is formed as well as iron nitride. The implanted layer has the following structure. The top layer - is the nitride layer with the highest values of microhardness up to 19000 MPa. Then there is a zone of internal nitriding of the second kind with high values of microhardness up to 15000 MPa. Next there is a zone of internal nitriding of the first kind with micro-hardness gradually decreased to 4500 MPa. High implantation leads to the release in the nitrided layer, mainly chromium nitride particles. Combined treatment of the steel, including ultrasonic burnishing and implantation, provides over the entire temperature range formation the nitrided layers with greater depth. This is due to the intensification of diffusion processes through the preliminary modification of the surface layer of the steel.
Keywords: ultrasonic burnishing, high-intensity low-energy ion implantation of nitrogen, nitrided layer, phase composition, microhardness
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