About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
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| Symposium
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Additive Manufacturing: Advanced Characterization With Synchrotron, Neutron, and In Situ Laboratory-scale Techniques IV
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| Presentation Title |
In-situ characterization of defect formation and elimination dynamics during electron beam melting using high-speed X-ray imaging |
| Author(s) |
Jiandong Yuan, Luis Escano, Samuel Clark, Junye Huang, Ali Nabaa, Qilin Guo, Minglei Qu, Kamel Fezzaa, Lianyi Chen |
| On-Site Speaker (Planned) |
Jiandong Yuan |
| Abstract Scope |
Electron beam melting (EBM) is an additive manufacturing technology capable of producing parts that are difficult, inefficient, or unachievable through conventional methods and other AM technologies. However, a comprehensive understanding of the dynamics of electron beam-matter interactions in EBM remains elusive, which is a barrier for the development and adoption of EBM technology. Here, we report the dynamics and mechanisms of pore formation, pore elimination, and crack elimination in EBM. Three pore formation mechanisms are observed: (1) from feedstock powders, (2) from pre-existing defects, and (3) via capture by solidification front. One pore elimination mechanism is discovered: pore elimination due to metal vapor condensation, unique to EBM. One crack elimination mechanism is uncovered: crack elimination through remelting. These results will enhance the understanding of defect formation and evolution mechanisms in EBM and may inspire the invention of effective approaches to mitigate and control defects (porosity and cracks) in EBM. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Characterization, |