About this Abstract |
Meeting |
2024 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 III
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Presentation Title |
Mapping Solidification Pathways in Fe-Ni-Cr Alloys for Additive Manufacturing with Time-Resolved Synchrotron X-ray Diffraction |
Author(s) |
Joseph W. Aroh, Seunghee A. Oh, S. Thomas Britt, Andrew C. Chuang, P. Chris Pistorius, Fan Zhang, Anthony D. Rollett |
On-Site Speaker (Planned) |
Joseph W. Aroh |
Abstract Scope |
Additive manufacturing (AM) induces severe departures from typical processing conditions, often resulting in microstructures beyond conventional metallurgical knowledge. This is problematic for the solidification pathway in stainless steels, as the sequence of phases can significantly affect the properties of the AM-fabricated component. To investigate this solidification behavior at relevant length and time scales for AM, we employed in situ synchrotron X-ray diffraction to directly measure the evolution of both phase and (indirectly) temperature during laser melting and re-solidification. Experiments were performed on Fe-Ni-Cr alloys with a range of Cr/Ni ratios to assess compositional effects, while laser conditions were adjusted to study the influence of cooling rates. The time-resolved diffraction patterns were correlated with post-mortem characterization of the re-solidified melt tracks to construct a solidification pathway map for the Fe-Ni-Cr system. Comparisons to existing microstructure selection maps indicate significantly narrower boundaries between phase pathways in AM compared to conventional welding processes. |
Proceedings Inclusion? |
Planned: |
Keywords |
Solidification, Additive Manufacturing, Phase Transformations |