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https://sci.ldubgd.edu.ua/jspui/handle/123456789/11454
2026-04-08T04:12:34ZSurface nanocrystallization of low -alloyed steel by multidirectional severe plastic deformation for improved mechanical and tribological properties
https://sci.ldubgd.edu.ua/jspui/handle/123456789/12004
Title: Surface nanocrystallization of low -alloyed steel by multidirectional severe plastic deformation for improved mechanical and tribological properties
Authors: Максимів, Ольга Володимирівна; Гурей, Володимир Ігорович; Кирилів, Володимир Іванович; Гурей, Ігор Володимирович; Кирилів, Ярослав Богданович; Звірко, Ольга Іванівна
Abstract: Surface nanocrystallization of the low -alloyed structural 40X steel by severe plastic deformation (SPD) was
realized due to mechanical -pulse treatment (MPT) with different modes: unidirectional and multidirectional. The strengthened layer s with nanocrystalline structure (NCS) formed in the steel by both mode of deformation were characterized by improved mechanical properties and wear resistance compared with the heat -treated steel. Moreover, multidirectional deformation during MPT resulted in lower grain size of the surface layer, its highe r microhardness and the depth of the strengthening, and favourable surface parameters providing highe
r wear resistance compared with that produced with unidirectional deformation.2023-10-01T00:00:00ZInfluence of deformation force during vibration-centrifugal hardening on properties of nanocrystalline structure of steel 40Kh
https://sci.ldubgd.edu.ua/jspui/handle/123456789/11899
Title: Influence of deformation force during vibration-centrifugal hardening on properties of nanocrystalline structure of steel 40Kh
Authors: Кирилів, Ярослав Богданович; Кирилів, Володимир Іванович; Сас, Наталія Богданівна2023-08-01T00:00:00ZThe Mode Deformation Effect on Surface Nanocrystalline Structure Formation and Wear Resistance of Steel 41Cr4
https://sci.ldubgd.edu.ua/jspui/handle/123456789/11455
Title: The Mode Deformation Effect on Surface Nanocrystalline Structure Formation and Wear Resistance of Steel 41Cr4
Authors: Кирилів, Володимир Іванович; Максимів, Ольга Володимирівна; Гурей, Володимир Ігорович; Гурей, Ігор Володимирович; Кирилів, Ярослав Богданович; Звірко, Ольга Іванівна
Abstract: A surface nanocrystalline steel layer in the low alloy steel 41Cr4 was fabricated by using mechanical-pulse treatment (MPT) with different deformation modes. The structure parameters, the physical and mechanical properties, the wear resistance, and the surface topography parameters of the treated steel depending on the deformation mode were investigated. A tool with a smooth working surface was used for inducing unidirectional deformation in the top surface layer (shear), and a tool with the oppositely directed grooves was used for generating multidirectional deformation. The surface layer with a nanocrystalline structure formed by MPT using both of the tools was characterised by enhanced mechanical properties and wear resistance compared with those of the untreated or heat-treated steels. Inducing multidirectional deformation during the MPT resulted in a decrease in the grain size and an increase in the depth and microhardness of the surface layer due to it facilitating the generation of dislocations compared to those formed under unidirectional deformation. The results also demonstrated that favourable surface topography parameters providing the highest wear resistance of the steel were obtained at MPT using multidirectional deformation.2023-01-21T00:00:00Z