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

Definitions

• the present invention contemplates nickel-base alloys consisting in percent by weight essentially of about 0.1% to about 0.25% carbon, about 7 to about 10% chromium, about 0.75% to about 2% titanium, about 5% to about 6.25% aluminum, about 8% to about 12% cobalt, about 8% to about 12% tungsten, about 0.8% to about 2.5% hafnium, about 0.002% to about 0.2% boron, up to about 0.15% zirconium, about 1.5% to about 3.5% tantalum, about 0.2% to about 0.9% molybdenum, with the balance being essentially nickel.
• Hal. E Balanee Essentially and includes small amounts of unavoidable impurities and incidental elements.
• the present invention contemplates nickel-base alloys consisting in percent by weight essentially of about 0.1% to about 0.25% carbon, about 7.5% to about 10% chromium, about 0.75% to about 2% titanium, about 5% to about 6.25% aluminum, about 8% to about 12% cobalt, about 8% to about 12% tungsten, about 0.8% to about 2.5% hafnium, about 0.002% to about 0.2% boron, up to about 0.15% zirconium, about 1.5 to about 3.5% tantalum, about 0.2% to about 0.9% molybdenum, with the balance being essentially nickel.
• the tantalum content of the alloys is about 3.0%
• the total of the aluminum plus titanium percentages is about 7%
• the molybdenum content of the alloys is within the range of about 0.5% to about 0.7%.
• An illustrative alloy of the present invention consists essentially of about 0.15% carbon, about 9% chromium, about 0.7% molybdenum, about 1.5% titanium, about 5.5% aluminum, about 10% cobalt, about 10% tungsten, about 1.5 hafnium, about 0.02% Zirconium, about 0.015% boron, about 2.5 tantalum, with the balance being essentially nickel.
• This alloy when cast into gas turbine structures, gives parts characterized by a high combination of characteristics of impact resistance, high and intermediate temperature strength and ductility, reproducibility, resistance to thermal fatigue and the like.
• alloy of the present invention When tested in stress-rupture mode at 1600 F. (871 C.) under a load of 40,000 pounds per square inch (p.s.i.) (2812 kilograms per square centimeters [kg./cm. the alloy of the present invention had a life of 2335 hours with an elongation of 8.5%. In contrast, under the same conditions, alloy B had a life of only about 444 hours with an elongation of only 6.0%.
• the alloy of the present invention When tested in stress-rupture mode at 1800 F. (982 C.) under a load of 34,000 p.s.i. (2390 kg./cm. the alloy of the present invention had a life-to-rupture of 39.9 hours and an elongation of 7.5 This result is a substantial improvement as compared to results obtained with alloy B tested under the same conditions.
• the alloy of the present invention is a highly advantageous, commercially acceptable alloy especially in view of the fact that the alloy of the present invention exhibits high impact strengths of the order of about 25 foot-pounds or higher which impact strengths are relatively unaffected by exposure to high temperature for extended periods of time.
• the alloy of the present invention is also characterized by high resistance to thermal fatigue and high reproducibility from heat to heat.
• alloys within the ambit of the present invention are set forth (in percent by weight) in the following table:
• the alloys of the present invention are advantageously melted and cast under vacuum using investment casting techniques.
• the alloys of the invention can contain small amounts of incidental elements and impurities along with and encompassed within the term balance nickel. Such impurities and incidental elements should be maintained at as low a level practical considering the needs of commercial production.
• the alloys of the present invention while being particularly adapted for use as cast gas turbine components, such as turbine blades and the like, can be used also with advantage in any area of utility where strength at elevated temperatures is a necessary criterion.
• a nickel-base alloy consisting essentially in percent by weight of about 0.1% to about 0.25% carbon, about 7.5% to about 10% chromium, about 0.75% to about 2% titanium, about 5% to about 6.25% aluminum, the total of the percentages of aluminum plus titanium being at least 6.5%, about 8% to about 12% cobalt, about 8% to about 12% tungsten, about 0.8% to about 2.5% hafnium, about 0.002% to about 0.2% boron, up to about 0.15% zirconium, about 1.5% to about 3.5% tantalum, about 0.2% to about 0.9% molybdenum, with the balance being essentially nickel.

Landscapes

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

Applications Claiming Priority (1)

Publications (1)

Family

ID=22266260

Family Applications (1)

Country Status (5)

Cited By (6)

Families Citing this family (5)

Family Cites Families (2)

• 1970
  • 1970-12-14 US US00098013A patent/US3720509A/en not_active Expired - Lifetime
• 1971
  • 1971-12-01 JP JP46097078A patent/JPS5110574B1/ja active Pending
  • 1971-12-09 GB GB5733071A patent/GB1368832A/en not_active Expired
  • 1971-12-13 CA CA129,985A patent/CA946183A/en not_active Expired
  • 1971-12-14 FR FR7144943A patent/FR2118621A5/fr not_active Expired

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