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NANOSTRUCTURING AND HETEROGENEOUS STRENGTHENING OF TOOL MATERIALS FROM POWDER HIGH-SPEED STEEL
Abstract
The results of microstructure study, X-ray microanalysis, microhardness, porosity of sintered samples from a powder high-speed steel before and after hardening by the wave intensive plastic deformation are presented. It has been established that the basic elements in the composition of sintered samples from tungsten powders are C, O, Mo, Ca, V, Cr, Fe, W. Based on the analysis of the sintered samples microstructure, it was determined that the there is a uniform distribution of solid carbide in the base material volume. Based on the theoretical and experimental research, it was established that the use of hardening processing by wave deformation for tool materials from high-speed powder steel allow to reduce the porosity of the material up to 10 times, thereby increasing of tensile strength in bending and compression. Also there is an increase of the average microhardness value of hardened material in 1,8 times in the surface and surface layer and in 1,45 times at a distance equal to 7 mm from the place of strain wave propagation. The marked increase in the physical and mechanical properties of the material will improve the strength and wear resistance of cutting tools, made from developed materials.
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