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TECHNICAL PAPERS: Gas Turbines: Microturbines and Small Turbomachinery

The Oxidation of Metal Alloy Foils in the Presence of Water Vapor

[+] Author and Article Information
James M. Rakowski

Allegheny Ludlum Technical Center, Alabama and Pacific Avenues, Brackenridge, PA 15014-1597

J. Eng. Gas Turbines Power 126(4), 867-873 (Nov 24, 2004) (7 pages) doi:10.1115/1.1787508 History: Received October 01, 2002; Revised March 01, 2003; Online November 24, 2004
Copyright © 2004 by ASME
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References

Figures

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Oxidation of Type 347 in ambient air
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Effect of water vapor on the oxidation of Type 347
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SEM micrograph of the surface of Type 347 after 1000 h at 1300°F in air+10% water vapor
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SEM micrograph of the surface of Type 347 after 1000 h at 1400°F in air+7% water vapor
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Effect of flow rate on the oxidation of Type 347 in air containing water vapor at 1300°F (top—7% water vapor; bottom—10% water vapor)
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Effect of water vapor on the oxidation of Type 302B (high silicon)
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SEM micrograph of the surface of Type 302B after 1500 h at 1300°F in air+7% water vapor
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SEM micrographs of the surface of Type 302B after 1000 h at 1400°F in air+7% water vapor (top—typical; middle and bottom—spalled)
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Effect of higher chromium on the oxidation of austenitic stainless steels in air containing water vapor
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SEM micrograph of the surface of a high Cr austenitic alloy after 1500 h at 1300°F in air+10% water vapor
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SEM micrographs of the surface and of the scale in cross section of a high Cr austenitic alloy after 1500 h at 1400°F in air+7% water vapor
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Effect of water vapor on the oxidation of the HX alloy at 1300°F
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Effect of water vapor on the oxidation of the HX alloy at 1400°F
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Effect of water vapor on the oxidation of the 625 alloy at 1300°F
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Effect of water vapor on the oxidation of the 625 alloy at 1400°F
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SEM micrograph of the surface of a 625 alloy sample after 1500 h at 1300°F in air (top—air+7% water vapor; bottom—air+10% water vapor)
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SEM micrographs (secondary and backscattered electron modes) of the scale in cross section of a UNS N06625 sample after 1500 h at 1400°F in air+7% water vapor
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Chromium profiles as a function of distance from the scale/metal interface for 625 alloy samples exposed for 1500 h at 1300°F (SEM microprobe analysis)
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Chromium profiles as a function of distance from the scale/metal interface for 625 alloy samples exposed at 1400°F (SEM microprobe analysis)
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SAM compositional depth profiles from 625 alloy samples after 500 h exposure in air containing various levels of water vapor (a, oxygen; b, chromium; c, nickel)
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SAM compositional depth profiles from 625 alloy samples after 1500 h exposure in air containing various levels of water vapor (a, oxygen; b, chromium; c, nickel)

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