Metal treatment – Stock – Ferrous
Patent
1993-05-17
1995-08-29
Yee, Deborah
Metal treatment
Stock
Ferrous
148564, 148654, 148660, C22C 3818, C21D 600
Patent
active
054456851
ABSTRACT:
Ultrahigh carbon steels with superplastic properties are produced by heating a steel containing ferrite and carbide phases to a soaking temperature approximately 50.degree. C. above the A.sub.1 transformation temperature, soaking the steel above the A.sub.1 temperature for a sufficient time that the major portion of the carbides dissolve into the austenite matrix, and then cooling the steel in a controlled manner within predetermined limits of cooling rate or transformation temperature, to obtain a steel having substantially spheroidal carbides. New alloy compositions contain aluminum and solute additions which promote the formation of a fine grain size and improve the resistance of the carbides to coarsening at the forming temperature.
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Goldberg Alfred
Landingham Richard L.
Sherby Oleg D.
Strum Michael J.
Sartorio Henry P.
The Regents of the University of California
Yee Deborah
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