Abstract
AbstractImprovement of some physical and mechanical properties of surface layers of engineering steels by severe thermal-plastic deformation treatment due to high-speed friction and simultaneous rapid cooling in a special medium is analysed. Besides the structure dispersion down to nanostructure, the phase and the chemical compositions of the surface layer are modified by the treatment. It is shown that the improvement of physical and mechanical properties of the strengthened surface layer depends substantially on the coolant medium composition. Oil-base coolants provide higher microhardness, wear resistance and fatigue crack growth resistance.KeywordsNanocrystalline structureSteelMechanical-pulse treatmentMicrohardnessWear resistanceFatigue crack growth resistance
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