About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing of Metals: Multiscale and Non-Equilibrium Solidification Fundamentals
|
| Presentation Title |
Grain Refinement by Laser-Generated Ultrasound for the Powder Bed Fusion–Laser Beam Process |
| Author(s) |
Eglantine Vignal, Jérôme Laurent, Romane Rit, Morgan Dal, Pierre Hébrard, Thierry Malot, Frédéric Coste, Patrice Peyre, Pascal Aubry |
| On-Site Speaker (Planned) |
Eglantine Vignal |
| Abstract Scope |
Localized microstructural control remains a key challenge in additive manufacturing (AM).
This study demonstrates grain refinement in the Powder Bed Fusion–Laser Beam (PBF-LB) process using elastic waves induced by temporally modulated laser power, that generates a monochromatic ultrasonic field within the melt pool. Experiments on 316L stainless steel and Ti-6Al-4V alloys reveal significant grain refinement across a range of ultrasonic frequencies.
The underlying mechanisms are investigated using in situ laser interferometry, which probes normal displacement, and finite element (FE) modeling to account for thermal and mechanical effects. An Arbitrary Lagrangian-Eulerian (ALE) technique describes the free surface, and the melt pool is adaptively remeshed at specific time periods linked to vaporization or significant power modulation amplitudes. Preliminary bead-on-plate simulations indicate that ultrasound propagation into the melt pool can alter solidification conditions.
These results demonstrate the potential of ultrasound for microstructural refinement and provide new insights into acoustic-field-driven solidification in AM. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Process Technology, Solidification, Modeling and Simulation |