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Title: Development of iron aluminides for coal gasification systems

Abstract

The objective of the present study is to develop Fe/sub 3/Al-based aluminides with an optimum combination of strength, ductility, and corrosion resistance for use as hot components in advanced fossil energy conversion systems. Currently, heat-resistant alloys are either nickel-based or high-nickel-content steels containing a delicate balance of one or more of the strategic elements such as chromium, cobalt, and tungsten to produce the desired properties. The alloys under investigation in this study (iron aluminides) do not contain significant amounts of strategic elements, and they also have properties that make them attractive for fossil energy applications. Because of their ability to form a protective aluminum oxide film at very low oxygen partial pressures, iron aluminides near the Fe/sub 3/Al composition exhibit excellent corrosion resistance (including resistance to sulfidation) at high-temperatures in such environments. Other advantages are high strength at room temperature, lower density, and lower cost. Although the usefulness of the binary alloys is limited by low room-temperature ductility (1 to 2%) and poor hot strength above 550/sup 0/C, studies of several advanced (with minor alloy additions) iron-aluminum alloys based on the Fe/sub 3/Al composition indicate dramatic improvements in properties (McKamey and Liu 1986, McKamey et al. 1987). This report describesmore » recent progress in characterizing the effects of additions of other elements (<10 at. %) on the metallurgical and mechanical properties of our selected base alloy, Fe-28 at. % Al. 2 refs., 1 fig., 1 tab.« less

Authors:
;
Publication Date:
Research Org.:
Oak Ridge National Lab., TN (USA)
OSTI Identifier:
6485426
Report Number(s):
CONF-870659-2
ON: DE87011111
DOE Contract Number:  
AC05-84OR21400
Resource Type:
Conference
Resource Relation:
Conference: 7. annual gasification systems conference, Morgantown, WV, USA, 16 Jun 1987; Other Information: Portions of this document are illegible in microfiche products
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; 36 MATERIALS SCIENCE; COAL GASIFICATION PLANTS; MATERIALS TESTING; INTERMETALLIC COMPOUNDS; ADDITIVES; CORROSION RESISTANCE; TENSILE PROPERTIES; ALUMINIUM COMPOUNDS; CHROMIUM; COBALT; CREEP; DUCTILITY; ELONGATION; IRON COMPOUNDS; OXIDATION; TUNGSTEN; WELDING; YIELD STRENGTH; ALLOYS; CHEMICAL REACTIONS; ELEMENTS; FABRICATION; INDUSTRIAL PLANTS; JOINING; MECHANICAL PROPERTIES; METALS; TESTING; TRANSITION ELEMENT COMPOUNDS; TRANSITION ELEMENTS; 010404* - Coal, Lignite, & Peat- Gasification; 360105 - Metals & Alloys- Corrosion & Erosion

Citation Formats

McKamey, C.G., and Liu, C.T. Development of iron aluminides for coal gasification systems. United States: N. p., 1987. Web.
McKamey, C.G., & Liu, C.T. Development of iron aluminides for coal gasification systems. United States.
McKamey, C.G., and Liu, C.T. Thu . "Development of iron aluminides for coal gasification systems". United States.
@article{osti_6485426,
title = {Development of iron aluminides for coal gasification systems},
author = {McKamey, C.G. and Liu, C.T.},
abstractNote = {The objective of the present study is to develop Fe/sub 3/Al-based aluminides with an optimum combination of strength, ductility, and corrosion resistance for use as hot components in advanced fossil energy conversion systems. Currently, heat-resistant alloys are either nickel-based or high-nickel-content steels containing a delicate balance of one or more of the strategic elements such as chromium, cobalt, and tungsten to produce the desired properties. The alloys under investigation in this study (iron aluminides) do not contain significant amounts of strategic elements, and they also have properties that make them attractive for fossil energy applications. Because of their ability to form a protective aluminum oxide film at very low oxygen partial pressures, iron aluminides near the Fe/sub 3/Al composition exhibit excellent corrosion resistance (including resistance to sulfidation) at high-temperatures in such environments. Other advantages are high strength at room temperature, lower density, and lower cost. Although the usefulness of the binary alloys is limited by low room-temperature ductility (1 to 2%) and poor hot strength above 550/sup 0/C, studies of several advanced (with minor alloy additions) iron-aluminum alloys based on the Fe/sub 3/Al composition indicate dramatic improvements in properties (McKamey and Liu 1986, McKamey et al. 1987). This report describes recent progress in characterizing the effects of additions of other elements (<10 at. %) on the metallurgical and mechanical properties of our selected base alloy, Fe-28 at. % Al. 2 refs., 1 fig., 1 tab.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1987},
month = {1}
}

Conference:
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