|About this Abstract
||7th World Congress on Integrated Computational Materials Engineering (ICME 2023)
||Impact of Dendrite Tip Velocity Formulation on Simulated Microstructures of Powder Bed Fusion Ti-6Al-4V
||Brodan Richter, Joshua D. Pribe, Edward H. Glaessgen
|On-Site Speaker (Planned)
The relationship between the local undercooling, dendrite tip velocity, and dendrite tip radius is a critical materials relationship that controls solidification-based manufacturing processes. That relationship impacts the final grain structure, crystallographic texture, and micro-segregation. However, collecting experimental data for empirically determining the relationship is extremely challenging due to the high temperatures and micrometer scales characteristic of engineering alloy solidification. This work compares various analytical relationships for relating undercooling to dendrite tip velocity for Ti-6Al-4V and characterizes the sensitivity of the formulations to the input material properties. The formulations are used alongside thermal and microstructure evolution models in a computational materials framework to simulate the powder bed fusion additive manufacturing process and characterize the impact of formulation selection on the resulting grain structure. The results of this work demonstrate the importance of the assumed relationship between undercooling and dendrite tip velocity by characterizing its impact on the simulated microstructure.