Morphology of oxidation of alumina-forming iron-base alloys containing chromium and aluminum

Journal Article · Thu Oct 01 04:00:00 EDT 1981 · Oxid. Met.; (United States)

DOI:https://doi.org/10.1007/BF00603839· OSTI ID:5396259

Miner, R G; Nagarajan, V

A series of iron-base alloys have been oxidized at P/sub o2/.2*10/sup -1/ atm and at P/sub 02/.10/sup -18/ atm. The morphologies of the Al/sub 2/O/sub 3/ scales depend on the heating rate, Cr content and P/sub o2/ of the environment. When the specimens are slowly introduced in the hot zone and oxidized in air, all form Al/sub 2/O/sub 3/ scales with a convoluted morphology. The extent of the convolutions decreases with increase in Cr content. When rapidly heated and oxidized in air, the low Cr-containing alloys form internal oxides and a surface scale of Al/sub 2/O/sub 3/ which shows no convolutions. In the higher Cr containing alloys, internal oxidation is limited. In the low P/sub o2/ environment, the binary alloy fails to form a protective Al/sub 2/O/sub 3/ scale. All other alloys form external Al/sub 2/O/sub 3/ scales which show little or no convolutions. 3 refs.

• Research Organization: Univ of Calif, Berkeley
• OSTI ID: 5396259
• Journal Information: Oxid. Met.; (United States), Journal Name: Oxid. Met.; (United States) Vol. 16:3-4; ISSN OXMEA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404* -- Coal
Lignite
& Peat-- Gasification
36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
COAL GASIFICATION
GASIFICATION
IRON ALLOYS
IRON BASE ALLOYS
MORPHOLOGY
OXIDATION
OXIDES
OXYGEN COMPOUNDS
THERMOCHEMICAL PROCESSES