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Open AccessArticle

Quantifying the Contribution of Crystallographic Texture and Grain Morphology on the Elastic and Plastic Anisotropy of bcc Steel

1
Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Straße 1, 40237 Düsseldorf, Germany
2
Division of Physical Metallurgy, Materials Science Department, TU Darmstadt, Alarich-Weiss-Straße 2, 64287 Darmstadt, Germany
*
Author to whom correspondence should be addressed.
Current address: Department of Materials Science and Engineering, University of California Los Angeles, Los Angeles, CA 90095, USA.
Metals 2019, 9(12), 1252; https://doi.org/10.3390/met9121252
Received: 24 September 2019 / Revised: 24 October 2019 / Accepted: 25 October 2019 / Published: 22 November 2019
(This article belongs to the Special Issue Dislocation Mechanics of Metal Plasticity and Fracturing)
The influence of grain shape and crystallographic orientation on the global and local elastic and plastic behaviour of strongly textured materials is investigated with the help of full-field simulations based on texture data from electron backscatter diffraction (EBSD) measurements. To this end, eight different microstructures are generated from experimental data of a high-strength low-alloy (HSLA) steel processed by linear flow splitting. It is shown that the most significant factor on the global elastic stress–strain response (i.e., Young’s modulus) is the crystallographic texture. Therefore, simple texture-based models and an analytic expression based on the geometric mean to determine the orientation dependent Young’s modulus are able to give accurate predictions. In contrast, with regards to the plastic anisotropy (i.e., yield stress), simple analytic approaches based on the calculation of the Taylor factor, yield different results than full-field microstructure simulations. Moreover, in the case of full-field models, the selected microstructure representation influences the outcome of the simulations. In addition, the full-field simulations, allow to investigate the micro-mechanical fields, which are not readily available from the analytic expressions. As the stress–strain partitioning visible from these fields is the underlying reason for the observed macroscopic behaviour, studying them makes it possible to evaluate the microstructure representations with respect to their capabilities of reproducing experimental results. View Full-Text
Keywords: anisotropy; linear flow splitting; crystal plasticity; DAMASK; texture; EBSD anisotropy; linear flow splitting; crystal plasticity; DAMASK; texture; EBSD
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MDPI and ACS Style

Diehl, M.; Niehuesbernd, J.; Bruder, E. Quantifying the Contribution of Crystallographic Texture and Grain Morphology on the Elastic and Plastic Anisotropy of bcc Steel. Metals 2019, 9, 1252.

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