[Article] - Watching Steel Transform in Real Time at High Temperatures

Wednesday, October 29, 2025 - 17:33
Sous titre
This work clarifies the actual conditions under which dynamic transformation occurs in steel during hot deformation. Using synchrotron X-ray diffraction, it demonstrates that conventional methods often overestimate both the extent and the temperature range of such transformations.

Abstract
During hot deformation, steel may undergo a so-called “dynamic transformation,” where austenite converts to ferrite. This study, conducted on a Fe-0.1C-6Ni model steel, employed high-energy synchrotron X-ray diffraction (HEXRD) at PETRA III (DESY, Hamburg) to track these transformations in real time. The results show that the fraction of ferrite formed during deformation is extremely small (<1 %) and that dynamic transformation does not occur above the equilibrium temperature (Ae3), contrary to many reports based on ex-situ observations. The work highlights the key role of strain rate and stored energy in austenite, while underlining the importance of in-situ techniques for accurately capturing transformation mechanisms.

Autors 
Arina DeBoer, Imed-Eddine Benrabah, Cécile Rampelberg, Guillaume Geandier, Hatem Zurob
 

References
Scripta Materialia, Volume 265, 2025, 116737

DOI 
https://doi.org/10.1016/j.scriptamat.2025.116737

 

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