Title:

Modeling the role of local crystallographic correlations in lamellar microstructures of Ti-6Al-4V fabricated via laser powder bed fusion

Titanium-alloys are widely used as high temperature structural material and in recent years, additive manufacturing (AM) using Ti-6Al-4V as feedstock material has been popular due to its capability to fabricate complex parts. For modeling and predicting the large strain behavior of Ti-6Al-4V with fully α-lamellar structure, a lamellar visco-plastic self-consistent (VPSC) polycrystal plasticity model is adapted. The model incorporates the local crystallographic correlations including the slip transfer between adjacent lamellae and considers the non-Schmid effects for activation of pyramidal slip to capture tension versus compression asymmetry. The lamellar VPSC formulation considers paired α-lamellae and a procedure is developed to construct paired variants from experimental EBSD data. The habit plane of the paired lamellae has effect on the anisotropy in hardening. The model is calibrated and validated on a data set for Ti-6Al-4V fabricated via laser powder bed fusion.

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