About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing: Equipment, Instrumentation and In-Situ Process Monitoring
|
| Presentation Title |
Spatter Generators: Sizes, Locations, and Morphologies of Ejecta from Laser Powder Bed Fusion |
| Author(s) |
Nicholas Obrien, Jordan Weaver, Dave Deisenroth, Satbir Singh, Jack Beuth |
| On-Site Speaker (Planned) |
Nicholas Obrien |
| Abstract Scope |
Metal parts produced in laser powder bed fusion (L-PBF) still suffer from defects caused by spatter particles (particles ejected by the melt-pool and/or entrained by its plume), preventing the process’ wider adoption. Prior works have used combinations of in-situ imaging and ex-situ size analysis to observe spatter particle landing locations and sizes, but these separate analyses do not preserve the correlation between where a particle lands in the build area and its size/morphology.
This talk will present novel results from an experiment conducted at NIST, wherein the ejecta generated during a single layer were captured on sheet metal plates and imaged in an optical microscope in a near-natural state. These experiments revealed three types of spatter particles: those matching the feedstock, large spheroids, and partially melted/sintered agglomerates. The differences between these particles, their theorized generation mechanisms, and implications on build planning will be discussed. |