POSSIBILITIES OF COMBINED METAL HARDENING WITH WAVE DEFORMATION AND SUBSEQUENT HEAT TREATMENT

Nowadays, industry development requires making new strengthening technologies that allow expanding the rational scope of their application. It is quite promising to use methods of combined hardening that allow changing the physical and mechanical properties of the surface layer during successive external actions having different physical nature: sequential plastic deformation and external thermal effects. Therefore, the objective of the conducted study is to make a complex technology of combined deformation and thermal hardening. Preliminary plastic deformation is proposed to be carried out by the method of wave deformation hardening, in which the improvement of properties is achieved by forming structural imperfections of the crystal lattice of the material under the action of prolonged shock pulses of significant energy and duration. The use of these pulses contributes to a more complete plastic deformation of the hardened metal and the formation of a deeper hardened surface layer than with traditional methods of deformation hardening. The proposed combined technology, consisting in the use of wave deformation hardening before thermal treatment, allows to obtain high hardness and plasticity in the surface layer, provides an additional resource to increase the operational characteristics of the part. The novelty of the work is in the complex development of a method for combined wave deformation and thermal hardening of the surface layer of alloy steels. The conducted studies of the method have shown the high efficiency of the technology of combined deformation wave and thermal hardening for various grades of alloy steels.