ORNL-2(A): Environmental effects on iron aluminides

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Alloys based on the Fe{sub 3}Al system are under development at Oak Ridge National Laboratory (ORNL) in support of coal conversion and combustion materials requirements. Using H{sub 2}S-H{sub 2}-H{sub 2}O gas mixtures, several experimental iron-aluminum alloys have been tested to assess the effects of aluminum concentration on corrosion behavior at 700 to 800{degrees}C in a simulated gasifier environment. Included in these studies are alloys that have been aluminized to convert the outer surfaces to FeAl (50 at. % Al). Thermogravimetric analyses, metallographic and chemical analyses of the corrosion product scales, are performed to determine the role of constituent metallic elements ... continued below

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Pages: (10 p)

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DeVan, J.H. January 1, 1991.

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Alloys based on the Fe{sub 3}Al system are under development at Oak Ridge National Laboratory (ORNL) in support of coal conversion and combustion materials requirements. Using H{sub 2}S-H{sub 2}-H{sub 2}O gas mixtures, several experimental iron-aluminum alloys have been tested to assess the effects of aluminum concentration on corrosion behavior at 700 to 800{degrees}C in a simulated gasifier environment. Included in these studies are alloys that have been aluminized to convert the outer surfaces to FeAl (50 at. % Al). Thermogravimetric analyses, metallographic and chemical analyses of the corrosion product scales, are performed to determine the role of constituent metallic elements on oxidation and sulfidation processes. The corrosion resistance of Fe{sub 3}Al alloys is being evaluated by exposures at 600 to 900{degrees}C in the gas-cooler section of an operating gasifier in the United Kingdom. The nature of protective scales formed on Fe{sub 3}Al-based alloys in sulfur-containing atmospheres, as compared to air, is being evaluated using secondary ion mass spectroscopy (SIMS) and transmission electron microscopy (TEM). Marker experiments using {sup 18}O are conducted in conjunction with the SIMS studies to monitor oxide growth processes. 4 refs., 3 figs., 1 tab.

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Pages: (10 p)

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OSTI; NTIS; GPO Dep.

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  • 5. annual conference on fossil energy materials, Oak Ridge, TN (USA), 13-16 May 1991

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  • Other: DE91014576
  • Report No.: CONF-9105184-9
  • Grant Number: AC05-84OR21400
  • Office of Scientific & Technical Information Report Number: 5725959
  • Archival Resource Key: ark:/67531/metadc1093540

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  • January 1, 1991

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  • Feb. 10, 2018, 10:06 p.m.

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  • March 2, 2018, 7:58 p.m.

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DeVan, J.H. ORNL-2(A): Environmental effects on iron aluminides, article, January 1, 1991; Tennessee. (digital.library.unt.edu/ark:/67531/metadc1093540/: accessed July 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.