Special Metals Corporation

Societe Nationale D'etude Et De Construction De Moteurs D'aviation

Gernant E Maurer

William J Boesch

Jean M Theret

A gamma prime strengthened nickel-base alloy characterized by a highly desirable combination of stress rupture life, hot corrosion resistance, oxidation resistance, phase stability and ductility. The alloy contains from 14 to 18% chromium, from 0.3 to 3% molybdenum, from 4 to 8% tungsten, from 0.01 to 1.0% vanadium, from 3.5 to 5.5% aluminum, from 1 to 4% titanium, from 3 to 7% cobalt, from 0.01 to 0.05% carbon and from 0.035 to 0.1% boron.

Nickel base alloy

A method of heat treating and coating a nickel base alloy containing chromium, titanium, aluminum, cobalt, molybdenum, tungsten, boron and carbon. The alloy is heated at a temperature of at least 2050.degree. F. to put most of the coarse gamma prime particles into solution; treated within the temperature range of between 1800.degree. and 2000.degree. F. to initiate the formation of and form randomly dispersed gamma prime particles; treated within the temperature range of between 1500.degree. and 1800.degree. F. to precipitate fine gamma prime particles, to coarsen existing gamma prime particles and to precipitate discrete carbide particles; coated; treated at a temperature of at least 1600.degree. F. to lessen the sharp differential in chemistry between it and the coating at the interface thereof; and treated at a temperature within the range of between 1300.degree. and 1500.degree. F. to precipitate fine gamma prime particles, and discrete carbide particles at grain boundaries.

Treating nickel base alloys

A method of heat treating and coating a nickel base alloy containing chromium, titanium, aluminum, cobalt, molybdenum, tungsten, boron and carbon. The alloy is heated at a temperature of at least 2050.degree. F. to put most of the coarse gamma prime particles into solution; coated; treated at a temperature of at least 1600.degree. F. to lessen the sharp differential in chemistry between it and the coating at the interface thereof; treated within the temperature range of between 1500.degree. and 1800.degree. F. to precipitate fine gamma prime particles, to coarsen existing gamma prime particles and to precipitate discrete carbide particles; and treated at a temperature within the range of between 1300.degree. and 1500.degree. F. to precipitate additional fine gamma prime particles, and discrete carbide particles at grain boundaries.

A castable nickel-iron base alloy suitable for high temperature service and characterized by low thermal expansion and freedom from notch sensitivity and deleterious microshrinkage in castings. The alloy consists essentially of at least 16% nickel, at least 10% cobalt, up to 5% columbium, up to 3% tantalum, up to 2.5% titanium, up to 2% aluminum, 0.06% to 0.25% boron, up to 0.1% carbon, and the balance iron.

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New Hartford, NY, United States of America

Gernant E Maurer