INFLUENCE OF DISPERSION NITRIDE VANADIUM STRENGTHENING ON THE TRIBOTECHNICAL AND MECHANICAL PROPERTIES OF HYPEREUTECTOID STEELS
DOI:
https://doi.org/10.15407/plit2026.01.061Keywords:
wear-resistant steel, dispersion vanadium nitride hardening, tribotechnical, mechanical properties, alloyingAbstract
Increasing the wear resistance of friction pair materials can be achieved by using more advanced compositions of lubricants, such as solid lubricants, which are extremely stable in difficult operating conditions. The combination of several components with sharply different physical and mechanical properties allows you to create compositions with the necessary properties. In such materials, films of plastic material are formed on the areas of the solid component, which are formed either due to the difference in the coefficients of thermal expansion of the antifriction and solid components when the friction pair is heated, or as a result of mechanical spreading. Such alloys include hypereutectoid steels, which contain graphite inclusions and copper inclusions in the matrix. This study identifies the mechanisms and patterns of the influence of doping hypereutectoid steels with nitrogen and vanadium on the effectiveness of increasing their wear resistance under various wear conditions due to “hard lubrication” with graphite and a copper phase while maintaining and increasing their structural strength and wear resistance. Three groups of steels were studied: the first standard with a carbon content of 1.5%; the second also standard with 1.5% carbon alloyed with 13% copper; the third with a carbon content reduced to 1.2%. It was found that dispersion vanadium nitride hardening reduces the intensity of wear in all three groups of steels. Also, in all cases, a reduction in the friction coefficient by 15–27% is achieved. This is the result of solid lubrication with carbon and copper, which accumulate on the friction surface and form a third body on the surface of the friction pair. An almost threefold increase in the efficiency of “solid lubrication with graphite” of steel №2 is observed, mainly due to an increase in the amount and dispersion of graphite in the structure due to the modifying action of solid-soluble nitrogen during crystallization and phase transformations of steels and dispersion of the dendritic micro- and substructure by the nitride-vanadium phase.
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