Abstract
The effects of ion implantation on surface contour, microhardness, micro-, and submicrostructures, as well as chemical composition of surface layers of cermet hard alloy tools and high-speed steel tools subjected to ion implantation were experimentally studied. The microhardness change and concentration profiles of implanted elements for the modified layer were measured. It was shown that a thin crystalline structure of carbide grains was formed in this layer and the residual compressive strains increased the fatigue resistance of the tools. Formation of high-strength compounds such as borides, oxides, nitrides, etc. in the surface layer was recorded. Data for many implanted cutting tools were obtained, and wear was compared with that of unimplanted tools. It was found that, in the process of tool degradation, the implanted impurity migrated inward to a distance which exceeds the ion range by an order of magnitude. Wear resistance tests for the implanted tools have shown that the implantation effect depends not only on its mode and the ion beam composition but also on the type of material being machined and on the machining conditions.
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