Abstract
The dislocation structures produced in 12Cr2Ni4A steel during plastic deformation under tensile loading were studied. A sharp yield phenomenon was observed in the steel investigated. The multiplication of fresh dislocations and the formation of slip bands are the fundamental mechanisms for plastic deformation. Dislocation tangles and cells with a high dislocation density are gradually developed within ferrite laths with increasing strain, leading to strain hardening. The formation of dislocation structures is strongly affected by the carbides in the ferrite laths. It is found that microcracks nucleate at ferrite lath boundaries and the fracture unit is a single ferrite lath or the substructure of the recovered ferrite.
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