Structural changes in the surface layers of an EK79-ID alloy upon hardening treatments

Experimental data showing variation of the mechanical properties of the surface layer of a nickel-based EK79-ID alloy depending on the degree of surface straining are presented. The elastic modulus and the proof stress of the surface layer exhibit nonmonotonic variation with the degree of straining. The possible mechanisms determining changes in the elastic modulus in the course of the surface structure variation caused by the strain hardening are considered.