Dispersion of complex carbides at the oxidation front during the oxidation of 9Cr-1Mo steel

[Display omitted] •Multi-elemental complex carbides develop in 9Cr-1Mo steel exposed to CO2.•Both M7C3 and M23C6 have been identified in a multi-component carbide.•Most carbides oxidize upon exposure to the oxidation front forming an IOZ.•Certain carbides resist oxidation through the growth of a Cr...

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Bibliographic Details
Published in:Corrosion science 2020-04, Vol.165, p.108389, Article 108389
Main Authors: Coghlan, L., Yan, S., Shin, Aya, Pearson, J., Jepson, M.A.E, Higginson, R.L.
Format: Article
Language:English
Subjects:
Carbides
Carburisation
Carburizing
Chromium molybdenum steels
Coring
Exposure
Oxidation
SEM
Steel
Substrates
TEM
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Summary:[Display omitted] •Multi-elemental complex carbides develop in 9Cr-1Mo steel exposed to CO2.•Both M7C3 and M23C6 have been identified in a multi-component carbide.•Most carbides oxidize upon exposure to the oxidation front forming an IOZ.•Certain carbides resist oxidation through the growth of a Cr rich oxide shell. To better understand oxidation and carburisation processes taking place during exposure of 9Cr-1Mo steel experimental samples have been exposed at 600 °C and 620 °C to a CO2 rich atmosphere for various exposure times. Complex multi-elemental carbides form showing a range of compositions, with some showing coring/elemental segregation. Certain carbides show both M7C3 and M23C6 within a single multi-component carbide. At the oxidation front some carbides resist oxidation through growth of a Cr rich oxide shell. Carbides within both substrate and oxide have been characterized with mechanisms being proposed for the complex interactions taking place within both the substrate and oxide.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2019.108389