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%
• • 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
  • C22C19/055—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 20% but less than 30%
• • 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
  • C22C19/056—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 10% but less than 20%

Definitions

• the art has endeavored to provide cast alloys having high strength and ductility at room temperature in combination with high strength, creep resistance and duetility at elevated temperatures of the order of 1300 F. and higher.
• the alloys in order to be commercially practicable, must be amenable to be melted in air or under imperfect protective atmospheres and must be adapted to be cast not only in specially formulated precision casting mold media but also in commonly available foundry sand molds.
• alloys can be provided which possess an outstanding combination of characteristics including room temperature and elevated temperature strength and ductility.
• Another obj'ect of the invention is to provide a novel cast alloy having an outstanding combination of room temperature and elevated temperature characteristics.
• the invention also contemplates providing castings particularly adapted to be employed at service temperatures of the order of 1200 F. and higher.
• the present invention contemplates alloys containing in per cent by weight about 1 0% to about 20% chromium, about 5% to about 20% cobalt, about 6% to about 10% columbium, about 0.5% to about 3.50% molybdenum, up to about 0.25% carbon, up to about 12% iron, up to about 0.1% boron, up to about 0.5% zirconium, up to about 1% vanadium, up to about 1% silicon, with the balance being essentially nickel together with small amounts of impurities and deoxidants normally associated therewith.
• the alloys of the present invention usually, and advantageously, contain about 0.0001% to about 0.01% boron, about 0.001% to about 0.5 carbon, up to about 0.3% silicon, up to about 4% iron and up to about 0.05% zirconium.
• the alloys can be prepared in air or an inert atmosphere by first melting the required nick'el and cobalt, adding the required chromium, molybdenum and columbium (and incidental tantalum), thereafter adding the desired zirconium and boron, and finally, deoxidizing with about 0.1% by Weight of calcium silicide.
• any tantalum accompanying the columbium is to be treated as columbium for compositional purposes.
• the alloys of the present invention advantageously contain at least about 2.5% molybdenum.
• alloys containing about 12% to about 16% of either chromium or cobalt exhibit an advantageous combination of character istics.
• a heat treatment comprising a solution treatment at about 2000 F. to about 2100 F. for about 1 to about 8 hours and an aging treatment at about 1500 F. to about 1100 F.
• Furnac'e cooling or controlled sloW cooling through the range of 1500 F. to about 1100" F. or any part thereof can effectively substitute for all or part of said aging treatment.
• the cast alloy can be aged directly without solution heat treatment.
• Particularly suitable heat treatments are set forth in Table I:
• Alloys of the present invention have good rupture strength at temperatures below 1300 F.
• alloy No.4 when heat treated by heat treatment A- (see Table I), broke after 251 hours at a stress of 95,000 p.s.i. with 2.4% elongation and 7% reduction in area.
• the present invention is particularly applicable to the production of cast parts, compon'ents, etc., employed at temperatures up to about 1300 F.
• Such parts, components, etc. include extrusion dies, gas turbine rotors, aircraft hardware, paper mill components, etc.
• a casting for use at elevated temperatures up to about 1350 F. consisting essentially, in percent by weight
• a casting for use at elevated temperatures up to about 1350" F. consisting essentially, in percent by weight, of about 12% to about 16% chromium, about 12% to about 16% cobalt, about 7% to about 9% columbium, about 2.5% to about 3.50% molybdenum, up to about 0.05% carbon, up to about 12% iron, about 0.0001% to about 0.01% boron, up to about 0.05% zirconium, up to about 0.3% silicon, not more than 0.1% total aluminum plus titanium, with the balance being essentially nickel.
• a casting for use at 'elevated temperatures up to about 135 0 F. consisting essentially, in percent by weight, of about 10% to about 15% chromium, about 7% to about 15 cobalt, about.8% to about 9.5% columbium, about 3% molybdenum, about 3% to about 10% iron with the balance being nickel together with small amounts of deoxidants, impurities, incidental 'elements normally associated therewith and not more than about 0.1% total aluminum plus titanium, said casting being characterized in the solution treated and aged condition by room temperature tensile strength of at least about 153,600 pounds per square inch.

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)
• Heat Treatment Of Steel (AREA)
• Conductive Materials (AREA)

Priority Applications (7)

Applications Claiming Priority (1)

Publications (1)

Family

ID=22506917

Family Applications (1)

Country Status (6)

Cited By (3)

Citations (7)

Family Cites Families (2)

• 0
  • NL NL124041D patent/NL124041C/xx active
  • BE BE623451D patent/BE623451A/xx unknown
  • NL NL284163D patent/NL284163A/xx unknown
• 1961
  • 1961-10-10 US US144069A patent/US3220829A/en not_active Expired - Lifetime
• 1962
  • 1962-10-06 DE DEJ22467A patent/DE1278740B/de active Pending
  • 1962-10-10 GB GB38401/62A patent/GB957139A/en not_active Expired
  • 1962-10-10 CH CH1189662A patent/CH415065A/fr unknown

Patent Citations (7)

Also Published As

Similar Documents