Special Metals Corporation

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

William J Boesch

Gernant E Maurer

Richard W Fountain

Steven H Reichman

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 process for producing a shape memory effect alloy having a desired transition temperature. The process includes the steps of: providing at least one prealloyed powder of a shape memory effect alloy having a chemistry similar to that of the to be produced alloy and a transition temperature below the desired transition temperature of the to be produced alloy; providing at least one other prealloyed powder of a shape memory effect alloy having a chemistry similar to that of the to be produced alloy and a transition temperature in excess of the desired transition temperature of the to be produced alloy; blending said prealloyed powders; consolidating said blended powders; and thermally diffusing said consolidated powders so as to provide a substantially homogeneous alloy of the desired transition temperature.

Process for producing a shape memory effect alloy having a desired

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.

Low thermal expansion nickel-iron base alloy

A gamma prime strengthened nickel base alloy characterized by good hot corrosion resistance, strength, creep resistance, phase stability and stress rupture life. The alloy consists essentially of, by weight, from 12.0 to 20.0% chromium, from 4.0 to 7.0% titanium, from 1.2 to 3.5% aluminum, from 12.0 to 20.0% cobalt, from 2.0 to 4.0% molybdenum, from 0.5 to 2.5% tungsten, from 0.031 to 0.048% boron, from 0.005 to 0.15% carbon, up to 0.75% manganese, up to 0.5% silicon, up to 1.5% hafnium, up to 0.1% zirconium, up to 1.0% iron, up to 0.2% of rare earth elements that will not lower the incipient melting temperature below the solvus temperature of the gamma prime present in the alloy, up to 0.1% of elements from the group consisting of magnesium, calcium, strontium and barium, up to 6.0% of elements from the group consisting of rhenium and ruthenium, balance essentially nickel.

A gamma prime strengthened nickel base alloy having a 1650.degree. F impact strength of at least 6 ft.-lbs. after 35,000 hours exposure at 1600.degree. F. The alloy consists essentially of, by weight, from 12.0 to 20.0% chromium, from 4.75 to 7.0% titanium, from 1.3 to 3.0% aluminum, from 13.0 to 19.0% cobalt, from 2.0 to 3.5% molybdenum, from 0.5 to 2.5% tungsten, from 0.005 to 0.03% boron, from 0.005 to 0.045% carbon, up to 0.75% manganese, up to 0.08% zirconium, up to 0.5% iron, up to 0.2% of rare earth elements that will not lower the incipient melting temperature below the solvus temperature of the gamma prime present in the alloy, up to 0.02% of elements from the group consisting of magnesium, calcium, strontium and barium, balance essentially nickel.

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Utica, NY, United States of America

William J Boesch