About this Abstract |
| Meeting |
2026 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2026)
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| Symposium
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2026 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2026)
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| Presentation Title |
In situ Synchrotron Radiography of Bubble Dynamics in Tungsten During Laser Powder Bed Fusion |
| Author(s) |
Cesar Diaz-Caraveo, Zane Taylor, Tharun Reddy, Yunhui Chen, Paul Wallace, Alexander Rack, Steven Van Petegem, Leora Dresselhaus-Marais |
| On-Site Speaker (Planned) |
Cesar Diaz-Caraveo |
| Abstract Scope |
Laser powder bed fusion processing of tungsten presents an important opportunity for net-shape parts in extreme temperature environments like nuclear fusion. However, tungsten LPBF suffers from multiple cracking mechanisms, and it is greatly affected by impurity concentrations. Formation of nanopores has been reported extensively in the literature, but much is unknown about its dynamics. Here, we report our in-situ X-ray synchrotron radiography of bubble dynamics in single-track experiments. We observe bubbles coming mainly from the surface and vapor depression vicinity regions without the presence of a keyhole. Ex-situ characterization through XCT provides the final size and positions of the bubbles, and bubble cross-sectioning provides clues into their formation mechanisms as oxide precipitates are observed in their solidified walls. Our study demonstrates the first in-situ bubble dynamics observation in tungsten, a phenomenon with great relevance for the performance of LPBF tungsten-processed parts and their future applications. |
| Proceedings Inclusion? |
Undecided |