About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Computational Thermodynamics and Kinetics
|
Presentation Title |
Modelling Columnar-to-equiaxed Transition during Additive Manufacturing |
Author(s) |
Durga Ananthanarayanan, Niklas Holländer Pettersson, Greta Lindwall |
On-Site Speaker (Planned) |
Durga Ananthanarayanan |
Abstract Scope |
Columnar-to-equiaxed transition during directional solidification is typically modelled analytically taking into account different factors such as dendrite growth kinetics, constitutional supercooling, and number of nucleating sites for different thermal gradients and solidification rates. In additive manufacturing processing conditions, solute trapping also becomes important at higher solidification rates. In this work, we formulate a model to simulate columnar-to-equiaxed transition during additive manufacturing taking into account solute trapping and multicomponent interactions, which are important for non-dilute technical alloys. We apply this model to study columnar-to-equiaxed transition in different additively manufactured alloys where columnar-to-equiaxed transition is enabled through the addition of heterogeneous nucleating sites or inoculants. Through coupling with multicomponent thermodynamic databases, the importance of including rapid solidification effects and multicomponent interactions is highlighted. Finally, the simulation results are also compared with experimental measurements of the distributions of columnar and equiaxed grains in as-built microstructures. |
Proceedings Inclusion? |
Planned: |
Keywords |
Computational Materials Science & Engineering, Additive Manufacturing, Solidification |