Evolution of structural and phase states at large plastic deformations of an austenitic steel 17Cr-14Ni-2Mo

Abstract

We present the results of the investigation of the evolution of the defect substructure and phase transformations in the process of deformation by rolling and high-pressure torsion of a chromium-nickel steel 17Cr-14Ni-2Mo. Experimental evidences have been found in favor of the occurrence of γ → α(α′) → γ transformations as one of the mechanisms of plastic deformation and reorientation of the crystal lattice at large plastic deformations of the steel under study. It has been shown that the nanostructured states are formed in the process of interaction of localized deformation bands with microbanded twin structures. Mechanisms of deformation and reorientation of the crystal lattice upon the formation of the above-indicated states and possible mechanisms of phase transformations in the process of large plastic deformations of this steel have been discussed.