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The effect of deformation twinning on stress localization in a three dimensional TWIP steel microstructure

journal contribution
posted on 2015-06-01, 00:00 authored by V Tari, A D Rollett, H E Kadiri, Hossein BeladiHossein Beladi, A L Oppedal, R L King
We present an investigation of the effect of deformation twinning on the visco-plastic response and stress localization in a low stacking fault energy twinning-induced plasticity (TWIP) steel under uniaxial tension loading. The three-dimensional full field response was simulated using the fast Fourier transform method. The initial microstructure was obtained from a three dimensional serial sectionusing electron backscatter diffraction. Twin volume fraction evolution upon strain was measured so the hardening parameters of the simple Voce model could be identified to fit both the stress-strain behavior and twinning activity. General trends of texture evolution were acceptably predicted including the typical sharpening and balance between the 1 1 1 fiber and the 1 0 0 fiber. Twinning was found to nucleate preferentially at grain boundaries although the predominant twin reorientation scheme did not allow spatial propagation to be captured. Hot spots in stress correlated with the boundaries of twinned voxel domains, which either impeded or enhanced twinning based on which deformation modes were active locally.

History

Journal

Modelling and Simulation in Materials Science and Engineering

Volume

23

Issue

4

Publisher

Institute of Physics Publishing

ISSN

0965-0393

eISSN

1361-651X

Language

eng

Publication classification

C Journal article; C1 Refereed article in a scholarly journal

Copyright notice

2015, Institute of Physics Publishing