Coupled effects of grain size distributions and crystallographic textures on the plastic behaviour of IF steels |
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Authors: | Nicolas NicaiseStéphane Berbenni Francis WagnerMarcel Berveiller Xavier Lemoine |
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Institution: | a Laboratoire de Physique et Mécanique des Matériaux, LPMM, FRE CNRS 3236, Arts et Métiers, F-57078 Metz Cedex 03, France b Laboratoire d’Etude des Textures et Application aux Matériaux, LETAM, FRE CNRS 3143, île du Saulcy, F-57012 Metz Cedex, France c ArcelorMittal Maizières, R&D Automotive Products, F-57283 Maizières-lès-Metz, France |
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Abstract: | Micro-macro scale transition theories were developed to model the inelastic behaviour of polycrystals starting from the local behaviour of the grains. The anisotropy of the plastic behaviour of polycrystalline metals was essentially explained by taking into account the crystallographic textures. Issues like plastic heterogeneities due to grain size dispersion, involving the Hall-Petch mechanism at the grain scale, were often not taken into account, and, only the role of a mean grain size was investigated in the literature. Here, both sources of plastic heterogeneities are studied using: (i) experimental data from EBSD measurements and tensile tests, and, (ii) a self-consistent model devoted to elastic-viscoplastic heterogeneous materials. The results of the model are applied to two different industrial IF steels with similar global orientation distributions functions but different mean grain sizes and grain size distributions. The coupled role of grain size distributions and crystallographic textures on the overall tensile behaviour, local stresses and strains, stored energy and overall plastic anisotropy (Lankford coefficients) is deeply analyzed by considering different other possible correlations between crystallographic orientations and grain sizes from the measured data. |
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Keywords: | A Microstructures A Strengthening mechanisms B Elastic-viscoplastic material B Metallic material C Self-consistent scheme |
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