| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
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| Symposium
|
Additive Manufacturing: Microstructural and Mechanical Long-term Stability of AM Materials
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| Presentation Title |
In Situ Laser TEM and SEM Study of Austenitic Steel Solidification |
| Author(s) |
Kinga A. Unocic, John C. Lasseter, Kevin M. Roccapriore, Debangshu Mukherjee, Yousub Lee, Rangasayee Kannan, Philip D. Rack, Stephen Jessee, Lawrence F. Allard, Sebastien Dryepondt, Steven Randolph |
| On-Site Speaker (Planned) |
Kinga A. Unocic |
| Abstract Scope |
The direct fabrication of structural and functional materials through 3D printing is rapidly emerging as a key technology for applications in the nuclear, aerospace, and electronics sectors. 3D printing offers unmatched flexibility and adaptivity for creating small batches of complex parts. Current in situ monitoring of the process involves optical or IR cameras, or X-rays. In this study, we show the utility of laser systems on SEM and TEM instruments to demonstrate visualization of direct metal sintering and layer melting in situ. To simulate the bed fusion process, we address the study of isolated single-particle sintering and laser-powder interactions within a thin layer of 316 steel powder. Several exposure mechanisms were investigated; including single stationary beam pulse, multiple stationary beam pulses, and multiple beam pulses while the laser is in motion. Post-characterization of the microstructures utilizing high-resolution TEM and 4D-STEM will be presented. |
| Proceedings Inclusion? |
Planned: |