Formation of Structure in Metastable Austenitic Steel during Cold Plastic Deformation by the Radial Forging Method

Abstract

This work is devoted to the study of the formation of structure in the 08Kh18N10T-Sh industrial metastable austenitic steel during cold plastic deformation by the radial forging method. The results of the performed studies show that the formation of structure during deformation consists of three stages. At the first stage, an increase in the density of deformation twins and dislocations is observed, and the bands of deformation localization appear. Embryos of α-martensite appear on the deformation twins. At the second stage, the formation of α-martensite packages occurs, the density of deformation twins decreases, and the density of dislocations continues to increase incessantly. At the third stage, a predominantly globular subgrain structure is formed in the cross section of the rod, and a two-phase austenitic–martensitic band (lamellar) structure is observed in the longitudinal section.