|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||Quantifying Microstructure Heterogeneity for Qualification of Additively Manufactured Materials
||Additive Manufacturing beyond the Gaussian Beam: Insights from Microstructure-based Modeling Studies
||Daniel Moore, Theron Rodgers, Sergio Turteltaub, Daniel Moser, Heather Murdoch, Fadi Abdeljawadf
|On-Site Speaker (Planned)
In laser-powder-bed-fusion additive manufacturing (LPBF AM), Gaussian laser beams are typically used as the energy input source. Recent experimental studies revealed that the use of laser beam shapes could expand the AM processing windows and result in desired microstructures. However, the role of laser beam shapes in the evolution of AM microstructures is not well understood. Leveraging a recently developed model coupling thermal transport and microstructural evolution during LPBF, we examine the impact of Ring and Bessel-like laser beams on the spatial distribution of temperature fields and the evolution of grain microstructures. Computational studies reveal that such beams expand processing windows to power and speed combinations not commonly used with Gaussian beams. To expound on the differences between the different beam types, we employ multiscale modeling techniques to describe the mechanical responses of representative microstructures. The results demonstrate enhanced control of process-structure linkages by considering beam shapes in AM.
||Additive Manufacturing, Modeling and Simulation, Mechanical Properties