In situ synchrotron X-ray diffraction study of flash austenitization and process design insights in medium-Manganese steels for energy applications

Bowen Zou; Mathias Zapf; Thea Kannenberg; Daniel Schneider; Yixu Wang; Xiao Shen; Ulrich Prahl; Wenwen Song

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arXiv · 2606.28072

In situ synchrotron X-ray diffraction study of flash austenitization and process design insights in medium-Manganese steels for energy applications

Bowen Zou·Mathias Zapf·Thea Kannenberg·Daniel Schneider·Yixu Wang·Xiao Shen·Ulrich Prahl·Wenwen Song

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Abstract

Medium Mn steels (MMnSs) are promising candidates for energy-related infrastructure because their multiphase microstructures and austenite stability can be tailored to improve failure resistance under demanding service conditions. Flash austenitization (FA) provides a rapid route to form austenite while limiting prior austenite grain coarsening and substitutional solute homogenization, but the related short-time transformation kinetics remain insufficiently quantified. In the present work, the effects of FA temperature and initial microstructure on austenitization kinetics were investigated in an Fe-6Mn-1.5Si-1Cr-0.3Mo-0.05Nb-0.2C (wt.%) MMnS using dilatometry-integrated in situ synchrotron X-ray diffraction. Two initial microstructures produced by austenite reversion treatment (ART) were heated at 100 degrees C/s to 850 degrees C, 900 degrees C, or 950 degrees C and then held isothermally. Rapid heating alone is insufficient for full austenitization, even above the reference Ac3 temperature determined under slow heating. Full austenitization, defined by bcc fraction (f_alpha) <= 1 wt.%, requires short holding, decreasing from about 8 s at 850 degrees C to about 2 s at 950 degrees C. The final stage of austenitization is less sensitive to FA temperature than the early holding stage. The initial ART state mainly shifts the starting austenite fraction, whereas both states show comparable kinetic trends at higher FA temperatures.

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Bowen Zou, Mathias Zapf, Thea Kannenberg, Daniel Schneider, Yixu Wang, Xiao Shen, Ulrich Prahl, Wenwen Song. 2026-06-26. In situ synchrotron X-ray diffraction study of flash austenitization and process design insights in medium-Manganese steels for energy applications. https://arxiv.org/abs/2606.28072

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