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High Temperature Oxidation Behavior of Fe- and Ni-Based Alloy Foils in Water Vapor at 850 °C...

by Marie Romedenne, Rishi R Pillai, Sebastien N Dryepondt, Michael J Lance, Bruce A Pint
Publication Type
Conference Paper
Journal Name
Proceedings of NACE Corrosion Conference and Expo
Book Title
NACE CORROSION
Publication Date
Page Number
16594
Volume
Day 2 Tue
Conference Name
NACE CORROSION 2021
Conference Location
Salt Lake City, Utah, United States of America
Conference Sponsor
CHP
Conference Date
-

Operating temperatures above 700°C are desired to improve the efficiency of power generation systems such as microturbines. Therefore, the use of creep-resistant Ni-based or Fe-based alloys, which can form protective Cr2O3 and Al2O3 scales, is required. In this paper, Fe- and Ni-based alloy foils were oxidized in air + 10 % H2O for up to 3,000 h at 850°C to identify the most promising alloys. The thickness and chemical composition of the spinel oxide formed on top of the Cr2O3 scale varied between S3100, N08120 and N06230 alloy foils. In addition, the rate of Cr and Mn loss (spinel and Cr2O3 oxidation and volatilization) or Al loss (oxidation) and the dissolution of strengthening precipitates, were found to be a function of the nature of the formed oxide (Fe or Ni-rich spinel, Cr2O3, Al2O3). Alloys N06230 and alumina-forming austenitic (AFA) steels were found to be well-suited for the applications as microturbine recuperator foil materials up to 850°C.