| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Real Time Imaging
|
| Presentation Title |
Beam Control in LPBF and High-Speed Visualization |
| Author(s) |
Anthony D. Rollett, Guannan Tang, Nicholas Lamprinakos, Ziheng Wu |
| On-Site Speaker (Planned) |
Anthony D. Rollett |
| Abstract Scope |
Understanding the (laser) melting and resolidification process is central to control of powder bed fusion additive manufacturing. Vaporization generates keyholes or depressions and increases absorptance, hence efficiency, and high-speed visualization enables quantification of the many phenomena associated with keyholes. Beam wobbling/oscillation improves melt pool stability Ti-6Al-4V, reduces keyhole depth and mitigates porosity, all of which was visualized with synchrotron x-rays and fast detectors. The observations correlated very well with simulations of the fluid flow in the melt pool that used the lattice Boltzmann method*. Recent multi-track experiments at the ESRF designed to mimic LPBF more closely show a strong effect of oscillation on microstructure in Ti64 and on fluid flow. The latter was visualized with small tungsten particles: oscillation made the flow patterns less regular with a smaller average velocity.
* Communications Materials 2023 Wu et al. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Titanium, Characterization |