Elsevier

Scripta Materialia

Volume 128, February 2017, Pages 69-73
Scripta Materialia

Regular Article
Substructure induced twinning in low density steel

https://doi.org/10.1016/j.scriptamat.2016.10.001Get rights and content

Abstract

The stacking fault energy of low density steels is sufficiently high to suppress twin formation thereby the twinning induced plasticity effect is expected to disappear. The present work devotes to address the origin of deformation twinning in a duplex low density steel. The substructure evolution (i.e. formation, refinement, size stabilization and its rotation) provides local areas holding preferred orientation for twin nucleation. Twinning is more populated in regions possessing higher Schmid factor for slip than that of twin. The observed non-Schmid behavior is attributed to the substructure induced nature of twinning and increased feasibility of extrinsic stacking fault formation.

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Acknowledgment

The present work was carried out with the support of the Deakin Advanced Characterization Facility. The first author thanks the partial scientific support of Dr. Rahim Jafari form Iran University of Science and Technology.

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