High temperature corrosion behavior of iron-aluminide alloys and coatings

Conference · Fri Aug 01 04:00:00 EDT 1997

OSTI ID:510452

Tortorelli, P F; Pint, B A; Wright, I G

The long-term oxidation performance of ingot- and powder-processed Fe-28 at.% Al-(2--5)% Cr alloys with minor oxygen-active element or oxide additions was characterized for exposures in air at 1,000--1,300 C. Additions of zirconium or yttria substantially improved the adhesion of alumina scales grown on iron aluminides. At lower temperatures, the ingot-processed alloys performed similarly to ODS Fe{sub 3}Al alloys and other alumina-formers. However, at 1,200 and 1,300 C, the oxidation resistance of the ingot-processed Fe{sub 3}Al was degraded due to deformation of the substrate and some localized reaction product growth. Other oxidation experiments showed that the addition of an oxide dispersion to iron aluminides reduced the critical aluminum concentration for protective alumina scale formation. Oxide-dispersion-strengthened Fe{sub 3}Al alloys made from commercially prepared powders and an iron-aluminide coating with 21% Al and 1% Cr, prepared by a gas metal arc weld-overlay techniques, showed excellent oxidation/sulfidation resistance.

• Research Organization: Oak Ridge National Lab., TN (United States)
• Sponsoring Organization: USDOE Assistant Secretary for Fossil Energy, Washington, DC (United States)
• DOE Contract Number: AC05-96OR22464
• OSTI ID: 510452
• Report Number(s): CONF-9705115--2; ON: DE97007778
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CHROMIUM ALLOYS
CORROSION
CORROSION PRODUCTS
CORROSION RESISTANCE
INTERMETALLIC COMPOUNDS
IRON BASE ALLOYS
METALLURGICAL EFFECTS
OXIDATION
SULFIDATION
TEMPERATURE DEPENDENCE
YTTRIUM ADDITIONS
ZIRCONIUM ADDITIONS