|About this Abstract
|2023 TMS Annual Meeting & Exhibition
|Phase Transformations and Microstructural Evolution
|Quantifying the Beta-to-Alpha Solid-State Phase Transformation in Additive Manufactured Ti-6Al-4V Using High-Energy X-ray Diffraction Measurements and Phase Field Modeling
|Bonnie Whitney, Anthony Spangenberger, Dan Savage, Donald Brown, Travis Carver, Diana Lados
|On-Site Speaker (Planned)
The solid-state beta-to-alpha/alpha’ transformation in Ti-6Al-4V was studied through in-situ high-energy x-ray diffraction (HEXRD) experiments to quantify its kinetic and thermodynamic properties and support phase field (PF) modeling of the phenomenon. Additive manufactured specimens were subjected to judiciously selected thermal cycles that control the nucleation and growth rates of the alpha phase by cooling from the beta homogenization field by either quenching to an isothermal hold (between 700 and 950 °C) or continuous cooling (between 0.05 and 30 °C/s). The HEXRD data are analyzed using proven techniques to calculate volume-averaged, time-varying phase fraction, lattice stress/strain, and Al and V concentrations (specifically their segregation between alpha and beta) during heating and cooling of Ti-6Al-4V. The experimental data were further used to calibrate a PF model, and comparisons between the modeling and experimental results were made to demonstrate the viability of the approach and capabilities of the numerical technique.
|Titanium, Modeling and Simulation, Additive Manufacturing