About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Additive Manufacturing: Materials Design and Alloy Development IV: Rapid Development
|
Presentation Title |
Melt Pool Scale Modeling of Solidification Kinetics and Its Effects on Stainless Steel Microstructures for Laser Powder Bed Fusion |
Author(s) |
Joseph W. Aroh, P. Chris Pistorius, Anthony D. Rollett |
On-Site Speaker (Planned) |
Joseph W. Aroh |
Abstract Scope |
Laser Powder Bed Fusion (LPBF) builds components by using a rastering laser which produces microstructures comprised of thousands of repeating weld pools. Due to the rapid speed of the welds in LPBF, nonequilibrium effects such as metastable austenitic solidification and solute trapping may occur in austenitic stainless steels because of solidification kinetics. Because of the self-evident importance for microstructural prediction and control in printed alloys, a computational framework consisting of a thermal model, computational thermodynamics, and dendrite growth kinetics was developed for several stainless steel alloys. The output of this pipeline was compared to both in situ synchrotron x-ray diffraction experiments and ex situ microstructural characterization of cross-sectioned melt tracks. This work aims to elucidate the location dependent microstructural evolution of solidification features at the melt pool level to inform future alloy compositions, laser parameters, and scan strategies tailored specifically for the LPBF process. |
Proceedings Inclusion? |
Planned: |
Keywords |
Solidification, Phase Transformations, Additive Manufacturing |