|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||Advances in Titanium Technology
||A Microstructure-informed Crystal Plasticity Based Constitutive Model for DED Ti6Al4V Alloy
||Chamara Herath, Kavindu Wijesinghe, Ajit Achuthan
|On-Site Speaker (Planned)
The development of a hierarchical microstructure-informed crystal plasticity based constitutive model for directed energy deposited (DED) Ti6Al4V is discussed. DED Ti6Al4V often exhibits a Widmanstätten microstructure, which is a dual-phase microstructure consisting of α and α' palates in a β matrix arranged in colonies within grains. In addition, the microstructure also consists of grain boundary α surrounding the grains. The developed microstructure-informed constitutive model accounts for the geometric and mechanistic effects of the Widmanstätten microstructure and grain boundary α by explicitly considering these features in a 3D representative microstructure. Homogenization schemes are developed to effectively implement the constitutive model on a finite element analysis (FEA) framework. The anisotropy is realized as a natural outcome of a preferred alignment of α and α' palates inside colonies with respect to the build direction. The model is experimentally validated by obtaining the stress-strain behaviors in both the build and scan directions.
||Additive Manufacturing, Modeling and Simulation, Computational Materials Science & Engineering