| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
2025 Technical Division Student Poster Contest
|
| Presentation Title |
SPG-124: Sigma Phase Transformation Kinetics of a FeCrNi Alloy Studied by In Situ Neutron Diffraction |
| Author(s) |
Monika Rolinska, Matthew G. Tucker, Lewis R. Owen, Joakim Odqvist, Peter Hedström |
| On-Site Speaker (Planned) |
Monika Rolinska |
| Abstract Scope |
The sigma phase is a hard and brittle intermetallic compound that forms at grain boundaries in highly alloyed stainless steels when heat treated at temperatures above approximately 600 °C. In the Fe-Cr system, sigma phase formation is often negligible due to its sluggish kinetics. However, the addition of alloying elements accelerates its formation, posing challenges for the processing of high-performance materials such as duplex stainless steels. The effect of adding 7 wt% Ni to Fe-Cr has been investigated using in situ neutron diffraction. Compared to the Fe-Cr model alloy, the Fe-Cr-Ni alloy exhibited significantly faster sigma phase formation, achieving complete transformation to the sigma phase after 14 hours of heat treatment at 700 °C. |
| Proceedings Inclusion? |
Undecided |
| Keywords |
Iron and Steel, Phase Transformations, Characterization |