Deformation Behavior of Fe-Mn-Cr-N Austenitic Steel

The deformation-induced microstructures and fracture appearances of Fe-Mn-Cr-N austenitic steel have been studied by using metallography, X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. ϵ-Martensite and slip bands are the deformation-induced products on the {111}γ planes and appear as thin straight laths with a 60–80° alignment difference between them. ϵ-Martensite and slip bands were found to be kinked at face-centered cubic twin boundaries with a kink angle of 35–40°. The slip bands in the tensile deformation zone appear as a set of equilateral triangles. Slip-band traces with an intersecting angle of 60° between the bands are also observed on the transgranular facets of both impact and tensile fractures.