Abstract
Based on observations of slip traces and variant-pair boundaries obtained through the transformation of the Kurdjumov-Sachs (K-S) orientation relationship from quasi in-situ electron backscatter diffraction (EBSD), the corresponding slip systems, Schmid factors (SF), and geometric compatibility parameter (m') around the crack were calculated during tensile testing of lath martensitic steel. The occurrence of slip transfer, which typically happens at low values of m' or SF, resulted in stress concentration on crystallographic orientations of 50.5°, 60°, and twin-related orientations. However, more effective slip transfer and plastic deformation were observed at 20° due to larger m' and SF values.
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