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Superalloy material with improved weldability

United States Patent

February 24, 2004
View the Complete Patent at the US Patent & Trademark Office
A fusion weldable superalloy containing 0.005-0.5 wt. % scandium. In one embodiment, the superalloy may have a composition similar to IN-939 alloy, but having added scandium and having only 0.005-0.040 wt. % zirconium. A gas turbine component may be formed by an investment casting of such a scandium-containing superalloy, and may include a fusion weld repaired area. A scandium-containing nickel-based superalloy coated with an MCrAlY bond coat will have improved cyclic oxidation resistance due to the sulfur-gettering effect of the scandium.
Allen; David B. (Oviedo, FL), Wagner; Gregg P. (Apopka, FL), Seth; Brij B. (Maitland, FL)
Siemens Westinghouse Power Corporation (Orlando, FL)
10/ 092,326
March 6, 2002
STATEMENT OF GOVERNMENT INTEREST The government of the United States of America has certain rights in this invention pursuant to Contract Number DE-FC21-95MC32267 awarded by the United States Department of Energy.