US3362816A - Cobalt alloy - Google Patents

Cobalt alloy Download PDF

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Publication number
US3362816A
US3362816A US376582A US37658264A US3362816A US 3362816 A US3362816 A US 3362816A US 376582 A US376582 A US 376582A US 37658264 A US37658264 A US 37658264A US 3362816 A US3362816 A US 3362816A
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United States
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percent
nickel
alloy
cobalt
cobalt alloy
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Expired - Lifetime
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US376582A
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Winter Heinrich
Kiupel Horst
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FED REPUBLIC OF GERMANY
FEDERAL REPUBLIC OF GERMANY
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FED REPUBLIC OF GERMANY
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C19/00Alloys based on nickel or cobalt
    • C22C19/07Alloys based on nickel or cobalt based on cobalt

Definitions

  • the novel alloys have better high temperature characteristics than the hardenable nickel base superalloys.
  • the phases producing the hardening in the nickel-solid solution such as Ni Al or Ni Ti, dissolve at temperatures slightly above 1000 C. so that the upper temperature limit for using the known nickel base superalloys may only just exceed 900 C.
  • novel alloys are very well suited for hard facing machine parts subjected to high temperatures. Due to the high strength characteristics at high temperatures and its ductility, the molybdenum containing alloy can be directly used for the manufacture of turbine blades and vanes.
  • a cobalt base alloy consisting essentially of, 5 to 10 percent of nickel, by weight, from about 15 to about 30 percent of chromium, 10 to 20 percent of tungsten, 5 to 10 percent of nickel, and about 0.5 to 3 percent of zirconium boride ZrB the balance being cobalt.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Chemically Coating (AREA)
  • Inert Electrodes (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Description

United States Patent 3,362,816 COBALT ALLOY Heinrich Winter, Eschborn, Taunus, and Horst Kiupel,
Langen, Germany, assiguors to the Federal Republic of Germany as represented by the Secretary of Defense, Bonn, Germany N0 Drawing. Filed June 19, 1964, Ser. No. 376,582 Claims priority, application Germany, June 22, 1963,
2 Claims. (Cl. 75-171) Percent by weight Cobalt 55 Chromium 20 Tungsten 15 Nickel Our investigations concerning the incorporation of a hard temperature stable finely dispersed phase into an alloy of said type as matrix had the surprising result that a considerable improvement of the high temperature strength is attained when zirconium and boron, in an atomic proportion of about 1:2, corresponding to the compound ZrB are added to the melt in a total amount of up to about 12, preferably 1.5 to 3 percent by Weight of the alloy.
Already 0.5% by weight of such a Zr+2B addition to the base alloy produces a considerable increase of the high temperature properties. At 800 C. the hardness HV 5 increased from 98 to 134 kg./Inm. (The HV values designate the Vickers hardness, the numbers 5 etc, referring to the load in kg. applied for the test, in accordance with the ofiicial German testing standards, published as DIN 50133.)
Percent by Weight Cobalt 55 Chromium 20 Tungsten Nickel 5 Molybdenum 5 In such alloys, the malleability even increases up to an addition of 2% ZrB while also the strength characteristics at high temperatures show a strong increase. Above said limit, the malleability decreases again but even with an addition of 12% ZrB the alloy is not yet completely embrittled.
An alloy of the character described, containing 5% Mo and 1.5% ZrB tested in the cast state, had at room temperature an HV 30 of 357 kg/mm. and at 800 C. an HV 5 of 262 kg./mm.
It is surprising that forming the alloy and subsequent annealing for several hours at temperatures up to and exceeding 900 C. does not produce a decrease of the strength properties at room temperature but a further increase. The following values were measured at an alloy containing 5% Mo and 1.5% ZrB reduced by 50%.
HV 30 at room temperature 550 HV 5 at 800 C. 374 HV 30 after 3 hours annealing at 900 C. at room temperature 625 At the same time, the strength properties up to temperatures exceeding 1000 C. Were considerably increased. Particularly at temperatures about 900 C., the novel alloys have better high temperature characteristics than the hardenable nickel base superalloys. In said alloys, the phases producing the hardening in the nickel-solid solution, such as Ni Al or Ni Ti, dissolve at temperatures slightly above 1000 C. so that the upper temperature limit for using the known nickel base superalloys may only just exceed 900 C.
The novel alloys are very well suited for hard facing machine parts subjected to high temperatures. Due to the high strength characteristics at high temperatures and its ductility, the molybdenum containing alloy can be directly used for the manufacture of turbine blades and vanes.
We claim:
1. A cobalt base alloy consisting essentially of, 5 to 10 percent of nickel, by weight, from about 15 to about 30 percent of chromium, 10 to 20 percent of tungsten, 5 to 10 percent of nickel, and about 0.5 to 3 percent of zirconium boride ZrB the balance being cobalt.
2. The alloys as claimed in claim 1 wherein nickel is replaced partially by molybdenum.
References Cited UNITED STATES PATENTS 2,126,742 8/1938 Golyer 2,126,743 8/1938 Golyer 75 171 2,126,745 8/1938 Golyer 75-171 2,126,749 8/1938 Golyer 75-170 2,309,371 1/1943 Wissler 75-171 2,704,250 3/1955 Payson 75-171 DAVID L. RECK, Primary Examiner. HYLAND BIZOT, RICHARD O. DEAN, Examiners.

Claims (1)

1. A COBALT BASE ALLOY CONSISTING ESSENTIALLY OF, 5 TO 10 PERCENT OF NICKEL, BY WEIGHT, FROM ABOUT 15 TO ABOUT 30 PERCENT OF CHROMIUM, 10 TO 20 PERCENT OF TUNGSTEN, 5 TO 10 PERCENT OF NICKEL, AND ABOUT 0.5 TO 3 PERCENT OF ZIRCONIUM BORIDE ZRB2, THE BALANCE BEING COBALT.
US376582A 1963-06-22 1964-06-19 Cobalt alloy Expired - Lifetime US3362816A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEW34747A DE1259101B (en) 1963-06-22 1963-06-22 High temperature resistant, dispersion hardened cobalt alloy

Publications (1)

Publication Number Publication Date
US3362816A true US3362816A (en) 1968-01-09

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US376582A Expired - Lifetime US3362816A (en) 1963-06-22 1964-06-19 Cobalt alloy

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US (1) US3362816A (en)
DE (1) DE1259101B (en)
GB (1) GB1034551A (en)
NL (1) NL6402540A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3416916A (en) * 1966-07-07 1968-12-17 Union Carbide Corp Ductile cobalt-base alloy
US3436512A (en) * 1966-04-13 1969-04-01 Coast Metals Inc Method of spray coating gas seals of gas turbines and the like
US3937628A (en) * 1973-05-30 1976-02-10 Hitachi Metals, Ltd. Solid-solution strengthened austenitic alloys
US4123266A (en) * 1973-03-26 1978-10-31 Cabot Corporation Sintered high performance metal powder alloy

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2126742A (en) * 1936-04-17 1938-08-16 Golyer Anthony G De Alloy
US2126749A (en) * 1937-05-19 1938-08-16 Golyer Anthony G De Alloy
US2126745A (en) * 1936-08-25 1938-08-16 Golyer Anthony G De Alloy
US2126743A (en) * 1936-06-13 1938-08-16 Golyer Anthony G De Boron alloy
US2309371A (en) * 1940-06-11 1943-01-26 Haynes Stellite Co Cutting tool
US2704250A (en) * 1948-12-03 1955-03-15 Crucible Steel Company High temperature high strength alloys

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2996379A (en) * 1958-12-04 1961-08-15 Union Carbide Corp Cobalt-base alloy

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2126742A (en) * 1936-04-17 1938-08-16 Golyer Anthony G De Alloy
US2126743A (en) * 1936-06-13 1938-08-16 Golyer Anthony G De Boron alloy
US2126745A (en) * 1936-08-25 1938-08-16 Golyer Anthony G De Alloy
US2126749A (en) * 1937-05-19 1938-08-16 Golyer Anthony G De Alloy
US2309371A (en) * 1940-06-11 1943-01-26 Haynes Stellite Co Cutting tool
US2704250A (en) * 1948-12-03 1955-03-15 Crucible Steel Company High temperature high strength alloys

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3436512A (en) * 1966-04-13 1969-04-01 Coast Metals Inc Method of spray coating gas seals of gas turbines and the like
US3416916A (en) * 1966-07-07 1968-12-17 Union Carbide Corp Ductile cobalt-base alloy
US4123266A (en) * 1973-03-26 1978-10-31 Cabot Corporation Sintered high performance metal powder alloy
US3937628A (en) * 1973-05-30 1976-02-10 Hitachi Metals, Ltd. Solid-solution strengthened austenitic alloys

Also Published As

Publication number Publication date
NL6402540A (en) 1964-12-23
DE1259101B (en) 1968-01-18
GB1034551A (en) 1966-06-29

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