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Meeting MS&T21: Materials Science & Technology
Symposium Additive Manufacturing of Metals: Equipment, Instrumentation and In-Situ Process Monitoring
Presentation Title Studying the Effect of Inert Gases on Thermal Behavior in Laser Powder Bed Fusion Using In Situ Monitoring and Similarity Analysis
Author(s) Sujana Chandrasekar, Fred List, Sabina Kumar, Keith Carver, Jamie Coble, Vincent Paquit, Sudarsanam Suresh Babu
On-Site Speaker (Planned) Sujana Chandrasekar
Abstract Scope Inert gas is used in laser powder bed fusion to aid with cooling and avoid formation of reactive oxides on the part surface. However, the effect of different inert gases on thermal behavior has not been studied using in-situ monitoring. In this work, we use infrared monitoring of Ti-6Al-4V lattice structures to study differences between Argon and Helium in L-PBF. Lattices enable small spatially isolated regions where inert gas effects can be studied. Similarity analysis was used to study thermal signatures. Results indicate that Helium cools faster than Argon in some lattice nodes, as expected. But, the effect is limited by the size of conduction paths at lattice nodes. With large conduction paths, Helium and Argon cool at nearly identical rates. Inert gas and geometry need to be considered together while designing process parameters to achieve desired part properties.
Proceedings Inclusion? Undecided

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Advancing Measurement Science of Laser Powder Bed Fusion (LPBF) Process Monitoring Applying Thermal Imaging
Combined In-situ Monitoring of Meltpool, Powder Layer, and Part Topography for Laser Powder Bed Fusion (LPBF) Based Metal Additive Manufacturing
Defect Recognition and Improvement in Ti-6Al-4V Fabrication by In-situ Monitoring and Feedback System of Directed Energy Deposition LAMDA 200
Functionally Graded Material Development by Leveraging Ultrasonic Grain Refinement in Additive Manufactured Nickel 718
High-speed Observations and Quantification of Spatter in Laser Powder Bed Fusion
In-situ Sensing in Processing Parameter Development for Bismuth Telluride Bulk Part Fabrication Using Laser Powder Bed Fusion
Innovative and Practical Approaches to Laser Powder Bed Fusion Sensing and Process Enhancement
Laser Powder Bed Fusion of Tall Thin Walled Structures: Dimensional Inaccuracy Due to Local Buckling, and In Situ Infrared Imaging for Early Failure Detection
Materials Characterization of Anomalies Identified Through In-situ Process Monitoring Data Analytics
Melt Pool Level Flaw Detection in Laser Hot Wire Additive Manufacturing Using a Trained Convolutional Long Short Term Memory Autoencoder
Physics Guided Machine Learning DED Melt Pool Width Prediction
Plenoptic Imaging for In-situ PIV and Melt Pool Monitoring in Laser Directed Energy Deposition
Studying the Effect of Inert Gases on Thermal Behavior in Laser Powder Bed Fusion Using In Situ Monitoring and Similarity Analysis
Ultrasonics for Monitoring Melt Pool Dynamics and Solidification

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