Humeniuk I. Tribotechnical properties of steel 12C-18Cr-10Ni-Тi, surface-modified by combined coatings

The thesis is devoted to solving the actual scientific and technical task of increasing the wear resistance of surface layers of corrosion-resistant steel 12C-18Cr-10Ni-Тi by forming wear resistant combined diffusion, electrospray and composite electrolytic coatings of discrete and gradient type and establishing regularities of influence of their structural-phase composition, physical and mechanical properties and structural parameters on tribotechnical behavior. Investigation of regularities of formation and mechanisms of wear of multi-component chromoalluminized coating in conditions of dry sliding friction, depending on the chemical and structural-phase composition have been done. Investigation of the dependence of the influence of modification by thermal, chemical-thermal and laser treatment on the wear resistance and the wear mechanism of synthesized composite coatings. Using the energy approach to evaluation of wear-resistance of surface layers in conditions of their fracture at friction, a technological process of forming gradient coating on the surface of 12C-18Cr-10Ni-Тi steel with high workability and wear resistance was developed. A statistical analysis was carried out. Regression models of dependencies of optimization criteria were constructed.