On the nature of twin boundary-associated strengthening in Fe-Mn-C steel

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We unravel the nature of twin boundary-associated strengthening in Fe-Mn-C twinning-induced plasticity steel (TWIPs) by micro-pillar compression tests. Dislocation interactions with a coherent twin boundary and their role on strain hardening were investigated. The results indicate that twin-matrix bundles dynamically introduced by deformation twinning and their interaction with dislocations are required for strengthening Fe-Mn-C TWIPs, while single coherent twin boundaries enable dislocation transmission. Correlative studies on orientation dependent deformation mechanisms, detailed dislocation-twin boundary interactions, and the resulting local stress-strain responses suggest that twin boundary-associated strengthening is primarily caused by the reduction of the mean free dislocation path in nano-twinned microstructures. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2018-11
Language
English
Article Type
Article
Citation

SCRIPTA MATERIALIA, v.156, pp.27 - 31

ISSN
1359-6462
DOI
10.1016/j.scriptamat.2018.07.009
URI
http://hdl.handle.net/10203/245637
Appears in Collection
MS-Journal Papers(저널논문)
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