| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing: Equipment, Instrumentation and In-Situ Process Monitoring
|
| Presentation Title |
In-situ Process Monitoring of Laser Powder Bed Fusion Additive Manufacturing Using Thermionic Emission Detection |
| Author(s) |
Aiden A. Martin, Philip DePond, John Fuller, Saad Khairallah, Justin Angus, Gabe Guss, Manyalibo Matthews |
| On-Site Speaker (Planned) |
Aiden A. Martin |
| Abstract Scope |
In-situ process monitoring is required to improve the understanding and increase the reliability of additive manufacturing (AM) methods such as laser powder bed fusion. Here we discuss a methodology based on the thermally induced emission of electrons - thermionic emission - from the metal surface during laser heating. Experimental studies show that thermionic emission signatures are correlated to laser heating conditions that give rise to pore formation and regions where surface defects are pronounced. Thermionic sensor signals collected during processing monitoring of small scale part builds will be presented and compared to conventional photodiode based sensors. The information presented here is a critical step in furthering our understanding and validation of laser-based metal AM and demonstrates that the collected thermionic signals can be incorporated into conventional data collection methodologies. This work performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. |