The split-channel plane strain die compression test was performed in Sanicro 28 (UNS N08028) high-alloy austenitic stainless steel. The same grain was examined before and after interrupted split-channel plane strain die compression tests by electron backscattered diffraction (EBSD). All deformed specimens exhibited developments in deformed microstructure. The development of near boundary gradient zone (NBGZ) was quantified for specimens deformed at different reductions. NBGZ development was gradual, it increased as a function of deformation. The image quality (IQ) map from EBSD indicated the imposed strain and formation of slip lines in the deformed microstructures. The inclined nature of slip lines indicated nonuniform distribution of strain and few grains did not develop any slip traces. The knowledge about NBGZ is important to enhance/control localized corrosion phenomena.