About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
|
Towards a Future of Sustainable Production and Processing of Metals and Alloys
|
Presentation Title |
Hydrogen-based Iron Oxide Reduction for Green Steel Making Studied by Atomprobe Tomography |
Author(s) |
Dierk R. Raabe, Ayman El-Zoka, Baptiste Gault |
On-Site Speaker (Planned) |
Dierk R. Raabe |
Abstract Scope |
The lecture deals with key mechanisms of sustainable hydrogen- and ammonia-based direct reduction and hydrogen-based plasma reduction of iron oxides into iron from a near-atomistic perspective using atom probe tomography. We present results from cryogenic-atom probe tomography to study the quasi in-situ evolution of iron oxide in the solid and gas phases of the direct reduction of iron oxide by deuterium gas at 700°C. We observed several atomic-scale characteristics, including, D2 accumulation at the reaction interface; formation of a core (wüstite)-shell (iron) structure; inbound diffusion of D through the iron layer and partitioning of D among phases and defects; outbound diffusion of oxygen through the wüstite and/or through the iron to the next free available inner/outer surface; and the internal formation of heavy nano-water droplets at nano-pores. |
Proceedings Inclusion? |
Planned: |
Keywords |
Iron and Steel, Sustainability, Characterization |