About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Chemistry and Physics of Interfaces
|
| Presentation Title |
Compositional heterogeneities in additively manufactured
solidification microstructure: Solute trapping and non-equilibrium microstructure |
| Author(s) |
Chinnapat Panwisawas |
| On-Site Speaker (Planned) |
Chinnapat Panwisawas |
| Abstract Scope |
The stochastic nature of emerging metal additive manufacturing (AM) microstructure induced by thermal-chemical-fluid dynamics is the key to materials design, process optimisation and maximised AM performance. It is induced by metal powder size/shape distribution, energy input by process parameters, processing-induced defects (e.g. porosity, crack), and second-phase precipitation, which all result in heterogeneous non-equilibrium microstructural variations and site-specific behaviour. Solute element transport during rapid and repeated thermal cycle in AM which can induce non-equilibrium microstructure remains unprecedented. A computational materials engineering approach is developed to reveal the solute transport induced by melt convection which dilutes the partitioned solute at the solidification front and promotes solute trapping and elucidates the mechanisms of the subsequent microstructural transitions to ultra-fine cells and then to coarse cells. The detailed solidification pathway exhibits promising potential for additively manufactured ‘hard-to-print’ superalloys, reducing crack susceptibility by accelerating the solidification process, and aids materials design for better 3D printability. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Modeling and Simulation, Solidification |