About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
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Additive Manufacturing, Directed Energy Deposition of Metals: Processing – Microstructure – Mechanical Property Relationships
|
| Presentation Title |
Inhomogeneities in directed energy deposition of refractory metals with different melting temperatures and mass densities |
| Author(s) |
Anthony Stair, Bryan Webler, Jack Beuth, Maarten de Boer |
| On-Site Speaker (Planned) |
Anthony Stair |
| Abstract Scope |
In-situ mixing of metals via laser beam directed energy deposition (DED-LB) is of interest for developing refractory complex concentrated alloy. However, large differences in melting temperature and density can lead to inhomogeneities. To gain insight into these issues, we investigate the deposition of refractory metal Nb and Ta powders on like and unlike baseplates. When Ta powder is deposited on a Nb baseplate un-melted Ta powder particles are present, predominantly near the bottom of the melt pool. Bands of different compositions are observed throughout the melt pools, both when Ta powder is deposited on Nb baseplate and when Nb powder is deposited on Ta baseplate. Under all conditions investigated, depositing the denser Ta atop a Nb baseplate results in a chaotic interface profile, while the interface is smooth in the opposite case. This work provides a systematic study on process parameter dependence of inhomogeneities in DED-LB melt pools. |