| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing Modeling and Simulation: Microstructure, Mechanics, and Process
|
| Presentation Title |
Melt Pool Scale Modeling of Austenitic Stainless Steel Solidification Features in 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 numerous 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. To better understand the influence of these effects on the as-built microstructure at the melt pool scale, a computational framework consisting of a numerical thermal model, CALPHAD, and a dendrite growth model was developed for several stainless steels. The model was compared to both in-situ synchrotron x-ray diffraction experiments and post-mortem characterization of cross-sectioned single tracks. This work aims to elucidate the location dependent microstructural evolution of sub-grain features at the melt pool level to inform future alloy properties, laser parameters, and scan strategies tailored specifically for the LPBF process. |