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Title: Oxidation kinetics of some nickel-based superalloy foils and electronic resistance of the oxide scale formed in air. Part 1

Abstract

Haynes 230, Inconel 625, Inconel 718, and Hastelloy X foil specimens were oxidized in air for several thousand hours in the temperature range of 800--1,100 C. The oxidation kinetics of alloys studied obeyed the parabolic rate law. Haynes 230 exhibited the slowest oxidation kinetics of the alloys studied. X-ray diffraction, scanning electron microscopy, and electron probe microanalysis (EPMA) were the principal characterization tools employed. Chromium oxide, Cr{sub 2}O{sub 3}, was the predominant oxide phase in the oxide scale of all alloys studied. Manganese chromate was also detected in the oxide scales of Haynes 230, Hastelloy X, and Inconel 625. EPMA showed that the concentration of Mn in the oxide scale was much higher than in the alloy, indicating selective oxidation of Mn. The electronic resistance of the oxide scale was measured in air at temperatures up to 800 C on samples oxidized in air for up to several thousand hours. The oxide scale on Haynes 230 exhibited the lowest area-specific resistance, consistent with its slower oxidation kinetics.

Authors:
;
Publication Date:
Research Org.:
Univ. of Utah, Salt Lake City, UT (US)
OSTI Identifier:
20003170
Resource Type:
Journal Article
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 146; Journal Issue: 9; Other Information: PBD: Sep 1999
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 30 DIRECT ENERGY CONVERSION; SOLID OXIDE FUEL CELLS; CONNECTORS; HEAT RESISTING ALLOYS; NICKEL BASE ALLOYS; INCONEL 718; INCONEL 625; HAYNES ALLOYS; OXIDATION; CORROSION; ELECTRIC CONDUCTIVITY

Citation Formats

England, D.M., and Virkar, A.V. Oxidation kinetics of some nickel-based superalloy foils and electronic resistance of the oxide scale formed in air. Part 1. United States: N. p., 1999. Web. doi:10.1149/1.1392454.
England, D.M., & Virkar, A.V. Oxidation kinetics of some nickel-based superalloy foils and electronic resistance of the oxide scale formed in air. Part 1. United States. doi:10.1149/1.1392454.
England, D.M., and Virkar, A.V. Wed . "Oxidation kinetics of some nickel-based superalloy foils and electronic resistance of the oxide scale formed in air. Part 1". United States. doi:10.1149/1.1392454.
@article{osti_20003170,
title = {Oxidation kinetics of some nickel-based superalloy foils and electronic resistance of the oxide scale formed in air. Part 1},
author = {England, D.M. and Virkar, A.V.},
abstractNote = {Haynes 230, Inconel 625, Inconel 718, and Hastelloy X foil specimens were oxidized in air for several thousand hours in the temperature range of 800--1,100 C. The oxidation kinetics of alloys studied obeyed the parabolic rate law. Haynes 230 exhibited the slowest oxidation kinetics of the alloys studied. X-ray diffraction, scanning electron microscopy, and electron probe microanalysis (EPMA) were the principal characterization tools employed. Chromium oxide, Cr{sub 2}O{sub 3}, was the predominant oxide phase in the oxide scale of all alloys studied. Manganese chromate was also detected in the oxide scales of Haynes 230, Hastelloy X, and Inconel 625. EPMA showed that the concentration of Mn in the oxide scale was much higher than in the alloy, indicating selective oxidation of Mn. The electronic resistance of the oxide scale was measured in air at temperatures up to 800 C on samples oxidized in air for up to several thousand hours. The oxide scale on Haynes 230 exhibited the lowest area-specific resistance, consistent with its slower oxidation kinetics.},
doi = {10.1149/1.1392454},
journal = {Journal of the Electrochemical Society},
number = 9,
volume = 146,
place = {United States},
year = {1999},
month = {9}
}