Abstract
The underlying mechanism of dislocation substructure formation in a tensile deformed fine-grained high-Mn steel is reported using transmission electron microscopy. A cross-slip assisted dislocation truncation mechanism was revealed that formed strings of dislocation loops at early strain, which were also retained at fracture strain. Planar glide producing a Taylor lattice was also observed. The dislocation plasticity based on a cross-slip based mechanism delayed dynamic recovery in stage C to manifest an uniform strain hardening. Such a mechanism producing good combination of high strength and ductility is observed for the first time in high-Mn steel.
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