Metal treatment – Compositions – Heat treating
Patent
1990-05-31
1992-01-14
Dean, R.
Metal treatment
Compositions
Heat treating
148154, 148404, 148410, C22F 302, C30B 1316
Patent
active
050807269
ABSTRACT:
A method is provided for obtaining an alloy having an ordered microstructure which comprises the steps of heating the central portion of the alloy under uniform temperature so that it enters a liquid phase while the outer portions remain solid, applying a constant electric current through the alloy during the heating step, and solidifying the liquid central portion of the alloy by subjecting it to a temperature-gradient zone so that cooling occurs in a directional manner and at a given rate of speed while maintaining the application of the constant electric current through the alloy. The method is particularly suitable for use with nickel-based superalloys. The method of the present invention produces an alloy having superior characteristics such as reduced segregation. After subsequent precipitation by heat-treatment, the alloys produced by the present invention will have excellent strength and high-temperature resistance.
REFERENCES:
patent: 4853044 (1989-08-01), Ford et al.
patent: 4964453 (1990-10-01), Schmidt et al.
Metals Handbook, 9th Edition, vol. 15, 9/1988, pp. 318-323.
Izv. Vyssh. Uchebn. Zaved. Chem. Metall. (1), 124-128, 8/1988.
Ahmed Shaffiq
Bond Robert W.
McKannan Eugene C.
Schmidt Deborah D.
Adams Harold W.
Broad, Jr. Robert L.
Dean R.
Phipps Margery S.
Seemann Jerry L.
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