About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Frontiers in Solidification: An MPMD Symposium Honoring Jonathan A. Dantzig
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Presentation Title |
In Situ Synchrotron X-ray Diffraction Resolves the Transition from Ferritic to Metastable Austenitic Solidification in Fe-Ni-Cr Alloys |
Author(s) |
Joseph W. Aroh, Seunghee A. Oh, S. Thomas Britt, Emma Barake, Andrew C. Chuang, P. Chris Pistorius, Anthony D. Rollett |
On-Site Speaker (Planned) |
Joseph W. Aroh |
Abstract Scope |
The transition from ferritic to metastable austenitic solidification in stainless steels has been the subject of many investigations due to its significant impact on the final microstructure. Traditionally, this phenomenon is interpreted through the lens of CALPHAD predictions at the freezing temperature and microstructural characterization at room temperature. However, without substantiating evidence of the phases that appear during solidification and subsequent cooling, it is possible to misinterpret the actual microstructural development history. For this reason, we employed a novel synchrotron x-ray diffraction technique with high spatiotemporal resolution to directly observe and quantify the evolution of phases and temperature during in situ laser melting and re-solidification of Fe-Ni-Cr alloys. The time-resolved diffraction patterns were correlated with post-mortem characterization of the re-solidified melt tracks and competitive growth kinetics modeling. These experiments were performed on a range of Cr/Ni ratios and cooling rates to provide a comprehensive understanding of this elusive phenomenon. |
Proceedings Inclusion? |
Planned: |
Keywords |
Solidification, Phase Transformations, Modeling and Simulation |