About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Alloying Effects of X-N Solute Clustering in Low Temperature Nitriding of Austenitic Steels |
| Author(s) |
Goro Miyamoto, Yuiln Xie, Tadashi Furuhara |
| On-Site Speaker (Planned) |
Goro Miyamoto |
| Abstract Scope |
Expanded austenite, formed by low-temperature nitriding of austenitic steels, is a nitrogen-enriched fcc phase typically featuring Cr-N short-range ordering. Cr-N strong attractive interaction could also induce Cr-N clustering; however such solute clustering is not well investigated. In this study, we systematically investigated the dependence of such clustering on alloy composition in Fe-35Ni-X (X = Cr, Mo, V, Al, Mn) alloys nitrided at 673 K. Characterization by TEM and 3DAP revealed nano-scale X-N clusters and spinodal-like modulated structures in Cr-, Mo-, and V-containing alloys, while Al and Mn additions showed no such features. Thermodynamic calculations confirmed that the tendency for spinodal decomposition follows the strength of X-N attraction. Furthermore, the hardening correlates not only with nitrogen contents but also with these nanostructural features. The findings provide insight into tailoring the microstructure and properties of expanded austenite through strategic alloy design. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Phase Transformations, Characterization, Iron and Steel |