A Microstructural Investigation of Austenitic Heat Resistant Alloy after 500 h of Steam Oxidation

Bogdan Rutkowski; Krzysztof Baran; Remigiusz Błoniarz; Tomasz Kozieł

doi:10.3390/ma14061453

A Microstructural Investigation of Austenitic Heat Resistant Alloy after 500 h of Steam Oxidation

Materials (Basel). 2021 Mar 16;14(6):1453. doi: 10.3390/ma14061453.

Authors

Bogdan Rutkowski¹, Krzysztof Baran¹, Remigiusz Błoniarz¹, Tomasz Kozieł¹

Affiliation

¹ Faculty of Metals Engineering and Industrial Computer Science, AGH University of Science and Technology, Al. A. Mickiewicza 30, 30-059 Kraków, Poland.

Abstract

Alloy 709 was oxidized at 700 °C for 500 h in a steam environment. A microstructural analysis of the oxide scale is reported. Modern techniques of advanced electron microscopy were used to characterize the morphology of the oxide scale and recognize its single components. The material developed a complex, multilayered oxide scale. The outermost layer consisting of Fe₂O₃. Fe₂NiO₄ tI28 spinel was detected underneath. An internal oxidation zone is present in the innermost layer. High quality SEM-EDS maps give insight into a larger area of the oxide scale at a relatively low magnification.

Keywords: SEM; TEM; austenitic steel; steam oxidation.

Grants and funding

2017/26/D/ST8/00712/Narodowe Centrum Nauki