초록 ▼

A specific composition range and process sequence are described for the production of single crystal superalloy articles which have an exceptional combination of high temperature mechanical properties and resistance to oxidation and hot corrosion. The nominal composition in weight percent is 7.5% Cr

A specific composition range and process sequence are described for the production of single crystal superalloy articles which have an exceptional combination of high temperature mechanical properties and resistance to oxidation and hot corrosion. The nominal composition in weight percent is 7.5% Cr, 5.0% Al, 1.0% Ti, 2.0% Mo, 4.0% W, 12.0% Ta, 5% Co, balance nickel. Material of this composition is cast and solidified in single crystal form and heat treated to produce an optimum microstructure.

대표청구항 ▼

A method for producing a single crystal superalloy article, suited for use as an element in a gas turbine engine, which consists of: a. providing a composition consisting essentially of 6.5 to 8.2% Cr, 4.5 to 5.5% Al, 0.7 to 1.5% Ti, 1.7 to 2.3% Mo, 3 to 5% W, 10.0 to 13.5% Ta, up to 3% Re, 3 to 8%

A method for producing a single crystal superalloy article, suited for use as an element in a gas turbine engine, which consists of: a. providing a composition consisting essentially of 6.5 to 8.2% Cr, 4.5 to 5.5% Al, 0.7 to 1.5% Ti, 1.7 to 2.3% Mo, 3 to 5% W, 10.0 to 13.5% Ta, up to 3% Re, 3 to 8% Co, balance essentially nickel; b. melting and directionally solidifying the composition to produce a single crystal article; c. heat treating the article between about 2385°and 2390°F. for from about 1 to 10 hours; d. cooling the article; e. reheating the article to at least one temperature between about 1500°and 2100°F. and holding the article within the temperature range of 1500°to 2100°F. for from about 2 to 50 hours.