About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| 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 |
High-Speed Diffraction to Unravel Phase Transformation Pathways and Kinetics in Laser-Melted Fe-Cr-Ni Alloys |
| Author(s) |
Fan Zhang, Joseph Aroh, Andrew Chuang |
| On-Site Speaker (Planned) |
Fan Zhang |
| Abstract Scope |
Understanding phase transformations under the extreme thermal gradients and rapid solidification inherent in additive manufacturing (AM) is critical for advancing predictive materials models. We leverage high-speed synchrotron X-ray diffraction at 250 Hz to capture in situ, time-resolved phase transformation sequences and kinetics during laser melting of Fe-Cr-Ni alloys with four different Cr-Ni ratio compositions. This approach reveals detailed transient and metastable phase evolution pathways from melt to room temperature, providing unprecedented insight into solidification and solid-state transformations. These experimental data form the core of the AM-Bench 2025 Phase Transformation Sequence and Kinetics benchmark challenges, enabling rigorous evaluation and refinement of computational models. Our results demonstrate how composition and processing parameters influence transformation dynamics, highlighting the critical role of high-speed diffraction in bridging experimental observation and simulation. This benchmarking effort lays a foundation for quantitative validation of predictive tools, accelerating materials design and manufacturing optimization far from equilibrium. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Phase Transformations, Characterization |