Technological Principles of Plasma Nanostructuring of Tool Composites for Instruments with Complex Surface Shapes

Based on the results of studying the structure and properties of tool steels (R6M5 and Kh12M) and hard alloy VK8 used in threading tools (cutters, combs, and rollers), it is determined that a nanocrystalline structure can be formed in the modified region formed during surface treatment with a highly concentrated plasma jet. The formation of nanodisperse particles of martensite (in steels) and carbides (in steels and hard alloys) is caused by an increased cooling rate and manifestation of the barrier effect of dispersion hardening under conditions of rapid crystallization (microfusion treatment) or rapid quenching (nonmelting treatment). The effect of plasma treatment on the cutting surface of grinding wheels made of superhard materials with metallic binders is studied. The change in the elemental surface composition, the presence of an oxygen-containing coating film on the binder and superhard material grains, and the change of the hardness of the binder surface are shown.