About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
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Characterization of Minerals, Metals and Materials
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Presentation Title |
Porosity Evolution during Hydrogen-based Direct Reduction of Hematite Probed by 4D Synchrotron X-ray Nano-tomography |
Author(s) |
Yan Ma, Yen-Fan Wang, Katrin Bugelnig, Julie Villanova, Guillermo Requena, Dierk R. Raabe |
On-Site Speaker (Planned) |
Yan Ma |
Abstract Scope |
Hydrogen-based direct reduction (HyDR) is one of the most promising techniques to mitigate the massive CO2 emissions from the steel industry. HyRD by nature is a multistep solid-gas reaction, involving several complex phenomena, such as non-volume conserving phase transformations, mass loss and transport, etc. All these can lead to pore formation. However, a 2D post-mortem microstructural analysis is unsatisfactory to reveal the actual porosity, especially the connectivity of its networks. Yet, this information is crucial to better understand its role in the outbound mass transport of reduction product. In this study, we employed 4D synchrotron X-ray nano-tomography to characterize the porosity during HyDR of hematite. The time-resolved tomography scans showed the formation and evolution of the pores and their percolation features. The pore formation mechanism and the correlation between porosity evolution and reduction kinetics during HyDR are discussed. |
Proceedings Inclusion? |
Planned: |