|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||Quantifying Microstructure Heterogeneity for Qualification of Additively Manufactured Materials
||The Effect of Beam Shaping Strategies on Additively Manufactured Microstructures
||Giovanni Orlandi, Robert Moore, Theron Rodgers, Fadi Abdeljawad
|On-Site Speaker (Planned)
In Laser Powder-Bed Fusion Additive Manufacturing (LPBF AM), Gaussian beams are known to result in narrow AM processing windows, outside of which undesired AM microstructures are commonly observed. Recent experimental evidence in beam shaping strategies points to new routes of manipulating the spatial distribution of temperatures, allowing for direct control over AM microstructures. Using a coupled thermal diffusion-Potts Monte Carlo model, we examined the impact of Gaussian, Ring, and Bessel-like laser beam types on the evolution of thermal profiles and grain microstructures. It is shown that Ring and Bessel-like beams extend the AM processing window, resulting in a higher diversity of melt pool geometries, spatial distribution of thermal gradients, and resultant microstructures. High throughput simulations are used to develop design maps relating laser beam shapes to temperature profiles and resultant microstructures. Our modeling framework provides an approach to rapidly screen the AM design space for the optimal processing windows.
||Additive Manufacturing, Modeling and Simulation, Other