Classifications

• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C19/00—Alloys based on nickel or cobalt
  • C22C19/03—Alloys based on nickel or cobalt based on nickel
  • C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
  • C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
  • C22C19/053—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 30% but less than 40%

Definitions

• the present invention relatesto alloyssuitable for use' under stress at elevated temperatures and, more particu-.
• the metallurgist would, be unable to predict without reservation what. alloy. would render the best performance, although it be an unsatisfactory performance, at the higher temperatures.
• the second alloy may exhibit what may be termed retentive powers evento the extent which would make its use practical at higher operating levels of temperature and stress. Itshould be added that the problem is further complicated by-the-fact. that if a. precision cast article is desiredfeven the alloy with satisfactory physical properties, e.g., fracture properties, may be unsuitable if it cannot be cast in desired shape. Castability of an alloy has often been undesirably achieved at the expense of the physical properties thereof by altering the composition of the alloy.
• Another object of the invention is to provide a cast alloy capable of offering appreciable resistance to rupture and affording a relatively long service life at temperatures of 1.700" F. and above when subjected to severe stress, e.g., 30,000 'p.s.i.
• the invention also contemplates providing precision.
• the present invention provides cas nickel alloys, and particularly precision cast nickel alloys, capable of exhibiting substantial resistance to rupture for relatively long periods of time at temperatures of 1700* F.'when subjected to severe stress.
• the alloys contain from 6.0% to about 10% molybdenum, about 10% to 35% chromium, about 4% to 8% aluminum, about 0.1% to 3% titanium, and about 0.1% to about 5%. columbium, the balance being essentially nickel. Para ticularly good results are. obtainable anent both rupture life and castability properties in accordance with preferred alloys of our invention which contain about 6.0%" to about 9% molybdenum, about 10% to about 17% chromium, about 5% to 7% aluminum, about 0.3%. to
• Alloys contained iron, silicon, manganese, carbon, zirconium, calcium and boron in nominal amounts of 1%, 0.25%, 0.1%, 0.12%, 0.05%, 0.03% and 0.02%, respectively.
• the cast alloys of the present invention are characterized by other highly desirable properties.
• the alloys possess a markedly high tensile strength at elevated temperatures and exhibit highly satisfactory elongation properties.
• an alloy having a composition similar to alloy No. 2 of Table I but containing 6% aluminum manifested a tensile strength of 69,250 p.s.i. and an elongation of 20% when tested at a temperature of 1742 F. (950 C.).
• Another alloy tested at 1742 F. (950 C.) having a composition similar to alloy No. 2 herein but containing 1% titanium showed a tensile strength of 63,400 p.s.i. and 20% elongation.
• the alloys contain boron in a small but effective amount up to about 0.1% and zirconium in an amount up to about 2%. It is particularly important that the boron content not exceed 0.1% because the presence of greater amounts thereof is detrimental to achieving castings having good properties, e.g., excessive amounts result in brittle castings.
• the expression balance essentially nickel does not exclude the presence of other elements commonly present in such alloys as incidental elements, e.g., deoxidizing and cleansing elements, and impurities ordinarily associated therewith in small amounts which do not adversely afiect the basic characteristics of our alloys.
• the nickel content of the alloys is at least 40% by weight and it is preferred to employ a nickel content of 50% or more.
• alloys of the invention include up to 8% silicon, up to 25% cobalt, e.g., up to about cobalt, up to 25% iron, up to 0.25% carbon, up to 2% copper and up to 2.5% manganese.
• a cast nickel-base alloy characterized by a long rupture life when subjected to stress at temperatures of 1700 F. and above, said alloy containing from 6 .0% to about 0.1% to about 5% columbium, about 0.02% to 0.1% boron, up to 2% zirconium, up to 8% silicon, up to 2.5 manganese, up to 25 iron, up to 25% cobalt,
• a cast nickel-base alloy characterized by a long rupture life when subjected to stress at temperatures of 1700 F. and above, said alloy containing from 6.0% to about 9% molybdenum, about 10% to 17% chromium, about 5% to 7% aluminum, about 0.3% to 1.5% titanium, about 1% to 3% columbium, boron in a small but sufficient amount up to 0.1% to improve the ductility of.
• said alloy up to 2% zirconium, up to about 15%cobalt and the balance essentially nickel.
• a cast nickel-base alloy capable of withstanding high stress at elevated temperatures for a relatively long period of time, said alloy containing from 6.0% to about 10% molybdenum, about 10% to 35% chromium, about 4% to 8% aluminum, about 0.1% to 3% titanium, about manganese, up to 25% iron, up to 25% cobalt, up to:
• a cast nickel-base alloy capable of withstanding high stress at elevated temperatures for a relatively long period of time, said alloy containing from 6.0%,to about 10% molybdenum, about 10% to 35% chromium, about- 4% to 8% aluminum, about 0.1% to 3% titanium,
• a nickel-base alloy capable of withstanding-relatively high stress at elevated. temperatures for a relatively long period of time, said alloy containing from 6.0% to about 10% molybdenum, about 10% t'o about 35% chromium, about 4% to about 8% aluminum, about- 0.1% to about 3% titanium, about 0.1% to about5% columbium, boron in a small but sufiicient amount up to 0.1% to enhance the ductility of said alloy, up to 8% silicon, up to 2.5 manganese, up to 25% iron, up to 25% cobalt, up to 0.25% carbon, up to 2% copper and the balance essentially nickel.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Mechanical Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Turbine Rotor Nozzle Sealing (AREA)

Priority Applications (2)

Applications Claiming Priority (1)

Publications (1)

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Cited By (8)

Citations (2)

• 1957
  • 1957-09-16 US US683929A patent/US2912323A/en not_active Expired - Lifetime
• 1958
  • 1958-09-16 CH CH6400658A patent/CH374833A/fr unknown

Patent Citations (2)

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