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

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Choi,  Won Seok
Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon, South Korea;

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Sandlöbes,  Stefanie
Institute of Physical Metallurgy and Metal Physics, RWTH Aachen University, 52056 Aachen, Germany;
Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Malyar,  Nataliya
Nano-/ Micromechanics of Materials, Structure and Nano-/ Micromechanics of Materials, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Kirchlechner,  Christoph
Nano-/ Micromechanics of Materials, Structure and Nano-/ Micromechanics of Materials, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Dehm,  Gerhard
Structure and Nano-/ Micromechanics of Materials, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Raabe,  Dierk
Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Citation

Choi, W. S., Sandlöbes, S., Malyar, N., Kirchlechner, C., Korte-Kerzel, S., Dehm, G., et al. (2018). On the nature of twin boundary-associated strengthening in Fe–Mn–C steel. Scripta Materialia, 156, 27-31. doi:10.1016/j.scriptamat.2018.07.009.


Cite as: https://hdl.handle.net/21.11116/0000-0001-E683-7
Abstract
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. © 2018