Orientation dependence of the substructure characteristics in a Ni–30Fe austenitic model alloy deformed in hot plane strain compression

The present work examines in detail the substructure and texture characteristics in a Ni–30Fe austenitic model alloy subjected to deformation by plane strain compression (PSC) at temperatures between 700 and 900 °C to strains between 0.2 and 1 using a strain rate of 1 s−1. The flow curves display characteristics typical of limited dynamic recrystallization. The deformed matrix texture is similar to that expected for rolling/PSC deformation of face-centred cubic metals while the comparatively weaker dynamic recrystallization texture is dominated by the Cube component. The non-Cube deformed matrix grains contain “organized”, self-screening arrays of microbands aligned along the slip planes with high Schmid factors. By contrast, the Cube deformed matrix grains exhibit more “random” cell substructure with a low density of superimposed larger-angle dislocation walls. These walls are related to {1 1 1} slip planes at low strains, but tend to follow the rigid body rotation toward the compression plane at large strains.