The effect of deformation twins on the quasi-cleavage crack propagation in twinning-induced plasticity steels

(a) The geometries of pre-cracked specimen used in this paper; (b) the plastic strain (ɛyy) field around crack tip during crack propagation as calculated by digital image correlation (DIC) technique, showing the stable crack propagation accompanied with large plastic deformation; (c) the quasi-cleavage fracture surface, showing a brittle fracture mechanism.415