About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
|
Symposium
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Additive Manufacturing Modeling, Simulation, and Machine Learning: Microstructure, Mechanics, and Process
|
Presentation Title |
CFD Simulations of Spatter Removal in a Laser Powder Bed Fusion Machine |
Author(s) |
Nicholas Obrien, Syed Zia Uddin, Satbir Singh, Jonathon Malen, Jack Beuth |
On-Site Speaker (Planned) |
Nicholas Obrien |
Abstract Scope |
In Laser Powder-Bed Fusion (LPBF) the melt pool can eject spatter on the scale of 20 µm to upwards of 100 µm, causing defects in the final part when it lands back in the build area. To prevent this, argon is blown parallel to the build plate, entraining spatter particles as they appear. In this work, computational fluid dynamics (CFD) simulations are employed to investigate the argon flow and its interaction with spatter ejected during the LPBF process. Spatter particles with various diameters and velocities are released at multiple locations in the machine. It is found that gravity and drag forces can cause spatter particles to either land on the powder bed or be carried from the machine. Simulation results are compared to spatter particle distributions visualized via infrared imaging. Design changes to the machine are explored to improve spatter removal. |