About this Abstract |
Meeting |
6th World Congress on Integrated Computational Materials Engineering (ICME 2022)
|
Symposium
|
6th World Congress on Integrated Computational Materials Engineering (ICME 2022)
|
Presentation Title |
Full Field Modeling of Austenitic Stainless Steel Solidification Features in Laser Powder Bed Fusion Melt Pools |
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) prints with a rastered laser which produces microstructures comprised of multiple weld pools in each layer. Due to the rapid speed of the welds, it is possible that metastable austenite becomes the primary solidification phase in austenitic stainless steels due to growth kinetics and potentially limited chemical segregation because of solute trapping. A computational framework consisting of a numerical thermal model, computational thermodynamics, and a dendrite growth model was developed to understand the location dependence of dendrite growth kinetics and segregation trapping at the full field melt pool scale 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 beads. 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. |
Proceedings Inclusion? |
Definite: Other |