|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Additive Manufacturing Fatigue and Fracture: Developing Predictive Capabilities
||High Strain Rate Deformation of EBM-Ti-6Al-4V: Microstructure, Texture, Mechanical Properties, Fracture Surface, Deformation Mechanism, and Constitute Modeling
||Reza Alaghmandfard, Mohsen Mohammadi
|On-Site Speaker (Planned)
In this study, cylindrical rods of Ti-6Al-4V were additively fabricated through the electron beam melting technique in horizontal and vertical directions. High strain rate compression tests using Split-Hopkinson pressure bar machine were performed from the strain rate of 150s-1 to 2350s-1 on both horizontal and vertical samples. Mechanical properties improvements along with microstructural and texture evolutions were evaluated. Deformation mechanisms including active slip and twin systems were comprehensively characterized. High strain rate induced phenomena such as adiabatic shear bands were defined, and utilizing in-depth microscopy techniques, physical metallurgy phenomena within these regions were investigated. Fracture surfaces were also studied, and texture evolution at the surface close to the fracture surface was discussed. The predictions of constitutive models used in this study were in good agreement with experimental observations. Generally, horizontally built samples revealed higher total strain at a specific strain rate, while higher strength was achieved in vertical samples.
||Additive Manufacturing, Titanium, Characterization