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Meeting MS&T23: Materials Science & Technology
Symposium Additive Manufacturing: Equipment, Instrumentation and In-Situ Process Monitoring
Presentation Title Two-color Melt Pool Thermal Imaging on Powder-blown Laser-DED to Advance Understanding of Melt Pool Thermal-fluid Physics
Author(s) Alexander J. Myers, Guadalupe Quirarte, Jack L Beuth, Jonathan A Malen
On-Site Speaker (Planned) Alexander J. Myers
Abstract Scope An experimental technique to image melt pool temperature with a commercial color camera for powder-blown laser directed energy deposition (L-DED) was developed. This technique relies on two-color thermography and high dynamic range photography to construct spatially-resolved thermal fields of 316L stainless steel melt pools from solidus to vaporization. By leveraging the principle of two-color thermal imaging, the need for a priori knowledge of melt pool emissivity and the camera’s view factor is negated. The system's ability to accurately measure temperature was validated with a calibrated tungsten filament. Comparing in-situ temperature measurements and ex-situ cross-sectional geometry to multi-physics computational fluid dynamics models provides a means of calibrating uncharacterized parameters, such as the temperature-dependence of surface tension. This state-of-the-art process monitoring tool provides multi-physics CFD model validation, cooling rates in the melt pool tail, and process mapping of critical melt pool behaviors such as the peak temperatures across processing space.


An Efficiency Study of Multi-Mode Laser Profiles
Customized Glove Box for In Situ Monitoring of Laser Directed Energy Deposition
Exploring a Supervisory Control System Using ROS2 and IoT Sensors
Fill Impact Welding: Additive Manufacturing through Ballistic Impact of Metallic Sheets
Implementing Statistical Process Control in Laser Powder Bed Fusion Metal Additive Manufacturing
In-situ Pyrometric Sensing for Real-time AM Process Monitoring and Control
Investigating the Effect of Part Geometry on Microstructure for Laser Powder Bed Fusion of Bismuth Telluride using In-Situ Process Monitoring
Melt Pool Scale Process Monitoring for Laser Hot Wire Additive Directed Energy Deposition
Quantification of Build Interruptions through In-Process Monitoring and Mechanical Test
Real Time Observations of In-Situ Alloying Molybdenum and Ti-6Al-4V in Laser Directed Energy Deposition Additive Manufacturing
Reinforcement Learning for In-situ Melt Pool Control during Laser Powder Bed Fusion
Robust Detection of L-PBF Process Anomalies Using High-speed On-axis Melt Pool Pyrometry
Two-color Melt Pool Thermal Imaging on Powder-blown Laser-DED to Advance Understanding of Melt Pool Thermal-fluid Physics

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