Plastic deformation hardening of iron-nickel alloys

The purpose of the study is to determine the influence of the structural state of the surface layer on the possibility of enhancing the properties of heavy-loaded parts, including gear wheels, by plastic deformation. Plastic deformation was carried out by shot-blasting treatment. Since the behavior of the structure of the carburized layer of gear wheels is very complex, single-phase iron-nickel alloys were studied as model alloys. It is shown that the contact fatigue strength and other operational properties of parts can be improved if we apply shot-blasting treatment in optimal conditions. After the latter should be low-temperature tempering, causing strain aging. The positive effect of such complex processing is associated with the formation of a favorable substructure - a substructure of martensite with high resistance to local microplastic deformation.