A Study of Plastic Deformation of 08G2B Steel Before and at the Yield Plateau by Digital Image Correlation Technique. Part 1. Formation of Plastic and Elastic Deformation Waves

Abstract

Specifics of plastic flow during tensile deformation of the samples of ultra-fine grained steel (08G2B) susceptible to deformation aging have been studied by using a digital image correlation technique. The heat treatment of steel was performed according to the following schemes: 1) heating to 250°C, soaking for 30 min, and cooling in air; and 2) heating to 680°C without soaking, and cooling in air. The standard flat samples were subjected to tensile testing at a constant deformation rate. It was shown that the Luders deformation in the tensile-loaded samples is concentrated in the flow channels formed at the stage of macro-elastic deformation and genetically connected with the maxima of the standing elastic wave.