The oxidation resistance of an FeMnSiCrNi alloy was recently improved by vacuum heat treatment. However, a detailed characterization was still necessary to understand the effects of the treatment on the material structure and on the oxide evolution. This was the aim of the present study. Samples were vacuum annealed at 1100 °C for 10 h and the material volatilized was characterized by EDS/XRD; cross-sections were evaluated by SEM/EDS while surface analyses involved SEM/EDS, XPS and Raman. Oxidation exposures were performed after vacuum annealing for 1, 5, 10 and 24 h at 800 °C and the oxides were characterized by SEM/EDS, XRD, Raman; TEM-ASTAR and XPS were used after 1-h oxidation. The results demonstrated that vacuum annealing increases significantly the superficial roughness and that besides Cr2O3 formation, Mn incorporation in the oxide layer increased with the test duration, forming MnCr2O4 and then Mn2O3. Finally, silica was also observed at the metal/oxide interface.
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AMSM would like to acknowledge the financial support of the SIMaP group during post-doctoral research (2018-2019) at Université Grenoble Alpes. Furthermore, we would like to acknowledge CMTC-Grenoble INP team for FIB preparation and TEM-ASTAR, performed by Florence Robaut and Gilles Renou; Raman analysis, performed by Alexandre Crisci; XRD analysis, performed by Stéphane Coindeau and Thierry Encinas; and XPS performed by Grégory Berthomé. Finally, this work has benefited from the support of the PSEUDO project of the French National Research Agency (ANR) and was performed within the framework of the Centre of Excellence of Multifunctional Architectured Materials "CEMAM" n°AN-10-LABX-44-01 funded by the "Investments for the Future" Program.
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de Sousa Malafaia, A.M., Latu-Romain, L. & Wouters, Y. FeMnSiCrNi Oxidation at 800 °C: Mechanism and Characterization of Improved Oxidation Resistance Generated by Vacuum Annealing Treatment. Oxid Met 96, 17–29 (2021). https://doi.org/10.1007/s11085-021-10038-7
- Vacuum annealing
- Mn-depleted zone
- Oxide evolution