About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
|
| Symposium
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Advances in Metal Matrix Composites: Processing, Additive Manufacturing, and Applications
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| Presentation Title |
Oxide Evolution in ODS Steel During Laser Powder Bed Fusion: Interplay Between Melt-Pool Dynamics and Dissolution-Precipitation Processes |
| Author(s) |
Qingyuan Li, Ali Nabaa, Deepak Ayyalasomayajula, Randall Volberg, Bonita Jianlin Goh, Chuan Zhang, Junye Huang, Jiandong Yuan, Junliang Liu, Minglei Qu, Samuel J. Clark, Mingyuan Ge, Yang Yang, Kamel Fezzaa, Robert P. Walsh, Xiang Chen, Lianyi Chen |
| On-Site Speaker (Planned) |
Qingyuan Li |
| Abstract Scope |
Oxide-dispersion-strengthened (ODS) austenitic steels are essential candidates for fusion energy applications, yet the mechanisms governing oxide retention and loss during laser powder bed fusion (LPBF) remain poorly understood. Here, we use a high-concentration addition strategy by introducing 3 vol.% (~2 wt.%) Y2O3 nanoparticles (30–50 nm) into nuclear-grade JK2LB austenitic steel. A hierarchical spatial distribution is observed, characterized by micron-scale surface slag and uniformly dispersed nanoparticles in the below-surface region. By integrating in-situ synchrotron X-ray imaging, CALPHAD modeling, high-fidelity thermo-fluid simulation, and multi-scale microscopy, we elucidate the retention-loss mechanism of yttrium oxides from kinetic and thermodynamic perspectives. Y2O3 retention is controlled by coupled dissolution, oxide-rich slag formation, residual oxygen, incomplete dissolution of agglomerated feedstock oxides, melt-flow transport, layer-wise inheritance of surface inclusions, and reprecipitation at the advancing solid-liquid interface. The matrix ultimately retains 0.2-0.3 wt.% dispersed yttrium oxides, establishing an oxide fate map for additively manufactured ODS alloys. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Composites, Iron and Steel |