Effect of boron and hafnium on the corrosion resistance of high-temperature nickel alloys

See adjacent abstract. Means of raising the corrosion resistance of nickel alloys used in cast turbine blades while maintaining their high temperature creep resistance were studied. Additional alloying of an alloy containing 15.0 chromium, 10.0 cobalt, 5.0 tungsten, 2 molybdenum, 3.0 aluminum, 4.5 t...

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Bibliographic Details
Published in:Metal science and heat treatment 1992-04, Vol.34 (3-4), p.251-254
Main Authors: BEGLOV, V. M, PISAREV, B. K, REZNIKOVA, G. G
Format: Article
Language:English
Subjects:
Applied sciences
Corrosion
Corrosion tests
Exact sciences and technology
Metals. Metallurgy
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Summary:See adjacent abstract. Means of raising the corrosion resistance of nickel alloys used in cast turbine blades while maintaining their high temperature creep resistance were studied. Additional alloying of an alloy containing 15.0 chromium, 10.0 cobalt, 5.0 tungsten, 2 molybdenum, 3.0 aluminum, 4.5 titanium, 0.1 carbon, 0.02 boron, 0.05 zirconium and 0.05% yttrium with 0.1% boron and 1% hafnium significantly raised its resistance to high temperature salt corrosion without sacrificing high temperature creep resistance. The introduction of Hf to the alloy protected it against general frontal corrosion attack without changing the depth of corrosion at the grain boundaries, while the B addition controlled corrosion near the grain boundaries. The new improved alloy could be useful in the manufacture of cast blades for ship gas turbine engines.
ISSN:0026-0673
1573-8973
DOI:10.1007/BF00702544