Features of properties, macro- and microstructure of surface layer of medium-carbon steels subject to combined hardening by EMT + SPD

The article presents the results of comprehensive studies of the structure and properties of the hardened surface layer of steels 45 and 55 formed as a result of a combined surface hardening technology consisting of electromechanical treatment (EMT) followed by surface plastic deformation (SPD). The analysis of macro- and microstructural features of the white layer formed by EMT + SPD is carried out. An assessment of the formation of a pattern of residual stresses on the elements of the macrostructure is proposed based on the transformation of the structure of the surface-hardened layer under the influence of a corrosive environment. The research results can be used to expand theoretical concepts and practical recommendations for the combined surface hardening technology EMT + SPD.