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
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| Presentation Title |
High-speed Schlieren Imaging of Laser Powder Blown Directed Energy Deposition |
| Author(s) |
Samantha Webster, Steven Mates, Carelyn Campbell |
| On-Site Speaker (Planned) |
Samantha Webster |
| Abstract Scope |
Laser powder blown directed energy deposition (DED-LB) has become a major focus within metal additive manufacturing due to its 5-axis processing capability and propensity for functionally graded materials. While it is known that shield gas flow rate and powder flow rate play a critical role in deposition of material, it is not well understood how shield gas interacts with the melt pool. To better understand the role of shield gas in DED-LB, in-situ high-speed Schlieren imaging was incorporated into the System for AM Alloy Development (SAMAD) at NIST. Single tracks of IN625 were deposited using three different laser beam distributions at shield gas flow rates of 5 LPM, 10 LPM, and 15 LPM. Competition between the shield gas flow and melt pool emissions was observed which played a significant role in melt pool stability, and the role of laser beam shapes will be discussed. |