About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
In-Situ Monitoring and Control of Solidification & Deformation Processes in Metal Additive Manufacturing
|
| Presentation Title |
Tracking Phase Evolution in Additive Manufacturing of Steels via Operando X-Ray Diffraction |
| Author(s) |
Steven Van Petegem |
| On-Site Speaker (Planned) |
Steven Van Petegem |
| Abstract Scope |
Understanding phase transformations during additive manufacturing is key to controlling microstructure and performance in metallic components. In this talk, we present insights from a series of operando synchrotron X-ray diffraction studies tracking real-time phase evolution during laser powder bed fusion (LPBF) and direct energy deposition (DED) of stainless steels and steel-based multimaterials. Across austenitic and ferritic grades, as well as 316L-IN625 combinations, we reveal how alloy composition, solidification velocity, and cooling rate influence the formation and retention of BCC and FCC phases. These experiments reveal how solidification mode transitions and phase retention, while broadly consistent with thermodynamic predictions, are strongly shaped by local thermal conditions and kinetics—features only captured through operando measurement. In systems with composition gradients or gas-atomization differences, even subtle shifts lead to distinct textures and phase fractions. These findings underscore the role of in-situ diagnostics in validating and refining models of phase evolution during metal AM. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Characterization, Phase Transformations |