High temperature scaling of binary Fe-Y alloys in pure oxygen

The scaling of two iron-based alloys containing 15 and 30 wt% yttrium as well as of pure yttrium has been studied at 600-800 deg C in 1 atm of pure O sub 2 . Both alloys formed external scales containing a mixture of iron and yttrium oxides plus double Fe-Y oxides followed by a region of internal ox...

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Bibliographic Details
Published inHigh temperature materials and processes Vol. 18; no. 3; pp. 185 - 195
Main Authors LI, Y. S, NIU, Y, GESMUNDO, F
Format Journal Article
LanguageEnglish
Published London Freund 01.02.1999
Tel Aviv
Subjects
Applied sciences
Corrosion
Corrosion environments
Exact sciences and technology
Metals. Metallurgy
Oxygen
Oxide layer
Corrosion rate
Oxidation
Yttrium alloy
Microstructure
Internal oxidation
High temperature corrosion
Iron base alloys
Binary alloy
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Summary:The scaling of two iron-based alloys containing 15 and 30 wt% yttrium as well as of pure yttrium has been studied at 600-800 deg C in 1 atm of pure O sub 2 . Both alloys formed external scales containing a mixture of iron and yttrium oxides plus double Fe-Y oxides followed by a region of internal oxidation of yttrium, so that the oxidation of iron could not be prevented. Corrosion of the two alloys was generally irregular and occurred at rates not very different from those of oxidation of pure iron. No yttrium depletion was observed in the alloys beneath the region of internal oxidation, in spite of the much larger stability of Y sub 2 O sub 3 with respect to iron oxides. The scaling behavior of the two alloys is interpreted by taking into account the limited solubility of yttrium in iron.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0334-6455
2191-0324
DOI:10.1515/HTMP.1999.18.3.185