About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fundamentals of Sustainable Metallurgy and Materials Science
|
| Presentation Title |
Atomic-level mechanisms of Fe2O3 reduction and a comparison to oxidation |
| Author(s) |
Martina Ruffino, Barak Ratzker, Baptiste Bienvenu, Guangyi Guo, Yan Ma, Dierk Raabe |
| On-Site Speaker (Planned) |
Martina Ruffino |
| Abstract Scope |
Hydrogen-based reduction of iron ore is a promising route towards lowering CO2 emissions in steelmaking. Here we focus on the atomic-level mechanisms governing the reduction of Fe2O3 to Fe3O4. Although this transformation is diffusional, it maintains the oxygen sublattice largely fixed, with long-range diffusion limited to iron ions. The Shoji-Nishiyama orientation relationship between the two phases ((111)Fe3O4||(0001)Fe2O3, [1-10]Fe3O4||[10-10]Fe2O3) is often observed during reduction, and it has been proposed that the transformation occurs on well-defined habit planes. Using transmission electron microscopy we find this assumption to hold for reduction at high temperatures as well as for the case of oxidation, where the interface is observed to advance via disconnection motion. However, at lower temperatures, we observe the progressive breakdown of the Shoji-Nishiyama orientation relationship. Using atomistic simulations, we investigate this transition by exploring the links between the creation of porosity during reduction and interface coherency and mobility. |
| Proceedings Inclusion? |
Undecided |
| Keywords |
Phase Transformations, |