Orientation-dependent plastic deformation in transformer steel: Experiments and dislocation dynamics simulations
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2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. The anisotropic tensile response of fully processed cold-rolled grain-oriented (CRGO) steel was studied for two crystallographic orientations: (110) 001 and (110) 111. They showed remarkably different stress-strain behavior and corresponding developments in deformed microstructures. The (110) 001 oriented CRGO steel specimens retained their orientation stability until (true strain) = 0.07. On the other hand, (110) 111 oriented specimens underwent significant reorientation and displayed formation of strain localizations by = 0.03. Discrete dislocation dynamics (DDD) simulations were carried out - three-dimensional (3-D) for "limited" (10-4) plastic strain and two-dimensional (2-D) for the experimentally imposed strain - to investigate the orientation effects on the tensile response of the CRGO steel specimens. 2-D DDD simulations were able to provide qualitative and quantitative estimates of the post-yield tensile behavior of (110) 001 and (110) 111 samples. Direct comparison between experimental and simulation results confirmed the orientation effect on the overall macroscopic response of the specimens. It was observed that the response of (110) 111 specimens showed features of reorientation and textural softening and these were captured by the Taylor type deformation simulations.
