About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
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Symposium
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Additive Manufacturing: Advanced Characterization with Synchrotron, Neutron, and In Situ Laboratory-scale Techniques III
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Presentation Title |
An Update on High-Speed Visualization and Beam Control |
Author(s) |
Anthony D. Rollett, Ziheng Wu, Guannan Tang, Samuel Clark, Andrey Meshkov |
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 various phenomena. We report on recent efforts to improve melt pool stability via beam wobbling. With synchrotron x-rays and fast detectors, the oscillations in melt pool depth were tracked in Ti-6Al-4V and correlated very well with simulations of the fluid flow in the melt pool that used the lattice Boltzmann method. Stabilization was demonstrated when oscillation was applied by the that resolidified surface exhibited a series of regular chevron markings. Another expected result was that hot cracking would be prevented, however, experiments on Aluminum 6061 alloy showed no mitigation of cracking. In conclusion, the application of oscillation in the laser spot position shows promise for stabilization of the melting process. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Titanium, Aluminum |