INVESTIGATION OF THE MECHANICAL PROPERTIES OF TOOL STEEL 45WCrV7 AFTER RADIAL-SHEAR ROLLING

The work is devoted to the study of the mechanical properties of low carbon tool steel 45WGrV7 after its volume-modification by application of an intensive plastic deformation process. Radial-shear rolling is a proven method of intensive plastic deformation in engineering practice, which produces quality long products with improved structure and properties. In the present work, rods with different final diameters, obtained by radial-shear rolling were investigated by carrying out three different degrees of relative deformation along the diameter of the rots - 30, 50 and 60%. On the basis of tensile and hardness tests, the influence of radial-shear rolling on the mechanical properties of the investigated steel - hardness, tensile strength, conditional yield strength and elongation after failure - was established. The comparative analysis shows that the strength properties after rolling increase by more than 2 times compared to those of the original steel, approaching the properties of expensive high-alloy, high-carbon steels. The findings are a prerequisite for continuing research in order to study and improve the operational properties of the studied steel.