About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
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Symposium
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Computational Techniques for Multi-Scale Modeling in Advanced Manufacturing
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Presentation Title |
Modeling the Role of Local Crystallographic Correlations in Microstructures of Ti-6Al-4V Using a Lamellar Visco-plastic Self-consistent Polycrystal Plasticity Formulation |
Author(s) |
Iftekhar Alam Riyad, Ricardo Lebensohn, Brandon McWilliams, Adam Pilchak, Marko Knezevic |
On-Site Speaker (Planned) |
Iftekhar Alam Riyad |
Abstract Scope |
This paper presents a multi-level crystal plasticity-based simulation framework for modeling mechanical response and microstructure evolution of Ti-6Al-4V. The model is a visco-plastic self-consistent (VPSC) formulation with an adaptation to linking three scales: a single crystals micro-scale, a lamellar colony meso-scale, and a lamellar aggregate macro-scale for lamellar microstructures. A hardening law in the model adjusts the resistances of basal and prismatic slip systems based on the geometry of possible slip transfer between adjacent lamellae. Consistent with experimental evidences, the resolved shear stress on the pyramidal slip planes considers the non-Schmid effects. Electron backscatter diffraction data in conjunction with a procedure relying on α→β phase transformation is used to construct paired variants of α-lamellae satisfying their local crystallographic correlations. The simulation framework is applied to interpret the deformation behavior of Ti-6Al-4V fabricated via laser powder bed fusion in stress-relived (SR) (α-lamellar structure) and heat treated ((α +𝛽)-globular structure) conditions. |
Proceedings Inclusion? |
Planned: |