Investigation of non-Schmid effects in dual-phase steels using a dislocation density-based crystal plasticity model
Article dans une revue avec comité de lecture
Date
2025-03Journal
Acta Mechanica SinicaAbstract
Non-Schmid (NS) effects in body-centered cubic (BCC) single-phase metals have received special attention in recent years.
However, a deep understanding of these effects in the BCC phase of dual-phase (DP) steels has not yet been reached. This
study explores the NS effects in ferrite-martensite DP steels, where the ferrite phase has a BCC crystallographic structure and
exhibits NS effects. The influences of NS stress components on the mechanical response of DP steels are studied, including
stress/strain partitioning, plastic flow, and yield surface. To this end, the mechanical behavior of the two phases is described by
dislocation density-based crystal plasticity constitutive models, with the NS effect only incorporated into the ferrite phase
modeling. The NS stress contribution is revealed for two types of microstructures commonly observed in DP steels: equiaxed
phases with random grain orientations, and elongated phases with preferred grain orientations. Our results show that, in the
case of a microstructure with equiaxed phases, the normal NS stress components play significant roles in tension-compression
asymmetry. By contrast, in microstructures with elongated phases, a combined influence of crystallographic texture and NS
effect is evident. These findings advance our knowledge of the intricate interplay between microstructural features and NS
effects and help to elucidate the mechanisms underlying anisotropic-asymmetric plastic behavior of DP steels.
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