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Effect of carbide volume fraction on the oxidation of austenitic Fe-Cr-C alloys

✍ Scribed by L. B. Susanto; D. J. Young

Publisher: John Wiley and Sons
Year: 2006
Tongue: German
Weight: 755 KB
Volume: 57
Category: Article
ISSN: 0947-5117
DOI: 10.1002/maco.200503945

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✦ Synopsis

A series of Fe-15Cr-(2-3)Mo alloys (compositions in weight percent) was produced with different carbon concentrations, to control the distribution of chromium between matrix metal and M 23 C 6 precipitates. The alloys were oxidized in the austenitic state at 850 C in pure oxygen, with and without a pre-oxidation treatment at low oxygen potential, where no iron oxide could form. Protective, chromia-rich scaling took place if the chromium concentration at the metal-scale interface was high enough. This concentration was controlled by the original alloy matrix chromium concentration, and whether or not a high diffusivity ferrite zone developed at the surface by decarburization. Ferrite zone formation was assisted by preoxidation at low oxygen potentials. The value of the carbides as suppliers of additional chromium was demonstrated by comparison with the oxidation performance of carbide-free alloys of corresponding matrix chromium levels. However, because dissolution of the coarse carbides could be slow, alloys with high volume fractions of large carbides were unsuccessful.

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