Furnace atmosphere effects on casting of eutectic superalloys

Details Furnace atmosphere effects on casting of eutectic superalloys Furnace atmosphere effects on casting of eutectic superalloys

Feb 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980mta....11..319g&link_type=abstract

Metallurgical Transactions A, Volume 11, Issue 2, pp.319-322

Physics

Scientific paper

Control of furnace atmosphere is a key factor in the use of silica-bonded alumina shell molds for the directional solidification of eutectic superalloys reinforced with tantalum monocarbide whiskers. The use of a furnace atmosphere which is simultaneously oxidizing to aluminum in the eutectic alloy and reducing to silica phases in the mold results in the formation of an alumina barrier layer in situ at the metal/mold interface and an absence of silica phases in the mold region adjacent to this barrier layer. The presence of this microstructure permits castings of eutectics at metal temperatures up to 1750°C.

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