Crystallographic Orientation Dependent Dislocation Slip During Thetensile of a Lath Martensite Steel

Abstract

Based on the observation on slip trace and crystallographic orientation from quasi in situ electron backscatter diffraction (EBSD), the corresponding slip system, Schmid factor (SF) and geometric compatibility parameter (m') around the crack were calculated during tensile of a lath martensite steel. The slip transfer, which typically occurs at low values of m' or SF, resulted in a stress concentration on crystallographic orientations of 52°, 60°, and twin-related orientations. However, the better slip transfer and plastic deformation is observed in 20° due to a large m' and SF.

Keywords: In-situ EBSD, Multi-level microstructure, Grain boundary junctions, microstructure, Dislocation slip, Deformation compatibility