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This paper unravels micromechanical aspects of metallic materials whosemicrostructure comprises grains of two or more phases. The local plasticresponse is determined by (i) the relative misorientation of the slip systemsof individual grains, and (ii) the different mechanical properties of thephases. The relative importance of these two mechanisms at the meso-scale isunclear: is the plastic response dominated by the grain's anisotropy, or isthis effect overwhelmed by the mechanical contrast between the two phases? Theanswer impacts the modeling of such a material at the meso-scale, but alsogives insights in the resulting fracture mechanisms at that length-scale. Untilnow, this question has been addressed only for particular crystallographies andmechanical properties. In contrast, this paper studies the issue systematicallyusing a large set of phase distributions, crystallographies, and materialparameters. It is found that the macroscopic and the mesoscopic(grain-averaged) plastic response of the two extreme modeling choices (crystalplasticity or isotropic plasticity) converge with increasing phase contrast.The effect of the crystallography is completely overwhelmed by the phasecontrast when the yield stress of the hard phase is a factor of four highercompared to the soft phase. When this ratio is lower than two, its influencemay not be neglected. However, even in this regime, fracture initiation iscontrolled by the local arrangement of the phases. The latter is quantified inthis paper through the average arrangement of the phases around fractureinitiation sites.

Microscopic plasticity and damage in two-phase steels: on the competing role of crystallography and phase contrast