| About this Abstract |
| 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. |