Evaluation of sheet and foil samples of two Cr2O3- and two Al2O3-forming alloys - tested for 360 days in air + 10 vol. % H2O at 760oC and 871oC. Alloys were ranked on weight change behavior and metal recession measurements, average internal penetration, and maximum internal penetration.
High-temperature alloys are susceptible to accelerated oxidation attack in the presence of water vapor, which can affect a components effective lifetime. The overall oxidation performance of the Cr2O3-forming alloys is critically linked to the chromium reservoir as Cr2O3-based scales are prone to vaporization when exposed to water vapor containing environments. This paper evaluates sheet and foil samples of two Cr2O3- and two Al2O3-forming alloys, which were tested for 360 days in air + 10 vol. % H2O at 760oC and 871oC. The alloys were ranked based on weight change behavior as well as metal recession measurements, which includes metal loss, average internal penetration, and maximum internal penetration. The results showed that the Ni-base, Cr2O3-scale forming alloy N06230 was more resistant than Fe-base N08120. An increased oxidation attack among the Cr2O3-formers was observed in sheet samples compared to foil samples. Both Al2O3-scale forming alloys outperformed the Cr2O3-forming alloys due to their ability to form and maintain a thin, adherent, and continuous Al2O3 scale for extended durations.
Key words: conference papers, 2017 conference papers, water vapor, oxidation, chromia- and alumina-forming alloys
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