| 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 |
In situ Monitoring and Closed-loop Control of Laser, Powder Blown Directed Energy Deposition Using a Coaxial Photodiode Array |
| Author(s) |
Samantha Webster, Jihoon Jeong, Alberto Castro, Lars Jacquemetton, Jon-Erik Mogonye, Shuheng Liao, Julian Rocher, Kornel Ehmann, Jian Cao |
| On-Site Speaker (Planned) |
Samantha Webster |
| Abstract Scope |
In-situ monitoring is critical for developing new control methods, advanced materials, toolpath planning strategies, and fundamental understanding in laser, powder-blown directed energy deposition (DED). While DED has become known for its flexibility in geometry and materials, there are still challenges in part uniformity due to localized processing. In this study, in situ, parallel monitoring of DED was established where a coaxial photodiode array was used to collect relative melt pool temperature data, laser light, and melt pool emissions in the visible range. Coupling between laser absorption and material emission was able to be identified by connecting photodiode signals with process parameters and spectrometer data. A subset of the photodiodes was then utilized in closed-loop control of DED to maintain a desired relative melt pool temperature throughout a single part. The system ultimately addresses heat accumulation across multiple build geometries, which can address non-uniformity of microstructures within a given part. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Process Technology, |