Abstract
The development of dislocation substructure has been studied in dual-phase steels using transmission electron microscopy. This substructure has been correlated with the fracture behavior of these steels. The high ductility and impact strength of the dual-phase steels seem dependent on their initial dislocation substructure, in which an important role is played by a/2 screw dislocations, which, when present in a crisscross configuration, can react, forming mobile a edge dislocations on their intersections. The presence and generation of the mobile a edge dislocations are considered here as a condition of the quasi-brittle behavior of these steels, and the nucleation of brittle cracks is discussed in terms of interactions between these dislocations.
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