US3591371A - Cobalt base oxidation resistant alloy - Google Patents

Cobalt base oxidation resistant alloy Download PDF

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Publication number
US3591371A
US3591371A US773149A US3591371DA US3591371A US 3591371 A US3591371 A US 3591371A US 773149 A US773149 A US 773149A US 3591371D A US3591371D A US 3591371DA US 3591371 A US3591371 A US 3591371A
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US
United States
Prior art keywords
alloy
cobalt base
oxidation
alloys
oxidation resistant
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Expired - Lifetime
Application number
US773149A
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English (en)
Inventor
Henri Hatwell
Charles D Desforges
Pierre L Moentack
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Haynes International Inc
Original Assignee
Cabot Corp
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Assigned to HAYNES INTERNATINAL, INC. reassignment HAYNES INTERNATINAL, INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: CABOT CORPORATION
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    • 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
    • C22C19/07—Alloys based on nickel or cobalt based on cobalt

Definitions

  • This invention relates to cobalt base alloys suitable for use at elevated temperatures and in oxidizing environments. More particularly, the present invention is directed to chromium-containing cobalt base alloys characterized by excellent oxidation resistance at temperatures of 1200 C. and above.
  • Cobalt base alloys have been employed in the past in high temperature applications on account of their advantageous mechanical properties under such conditions but on account of their rather poor resistance to oxidation at high temperature the use of such alloys has been severely restricted.
  • the oxidation of cobalt base alloys (and also that of the generally more oxidation resistant nickel base alloys) has been extremely poor at temperatures of 1200 C. and above.
  • This situation is unfortunate since at the present time there are many applications, e.g. jet aircraft engine components, in which cobalt base alloys could be used to great advantage if the oxidation resistance of these alloys, at temperatures of 1200 C. and above, could be improved.
  • FIGS. 1 and 2 show comparative oxidation data in the form of graphs for various alloys including alloys in accordance with the present invention
  • FIG. 3 shows, in the form of a graph, mechanical data for an alloy of the present invention.
  • a cobalt base alloy in accordance with the present invention contains at least 35% Co and about:
  • the alloy additionally contains manganese in an amount up to about 2% and is characterized by a further improve- 3,591,371 Patented July 6, 1971 ment in oxidation resistance under cyclic conditions, and improved mechanical properties.
  • the preferred manganese content is from about 0.4 to 1%.
  • cobalt base alloys containing from about 15 to 25% chromium can be remarkably improved in oxidation resistance at high temperatures by the addition of both silicon and lanthanum in controlled amounts when the tungsten content of the alloy is kept below about 3%.
  • the tungsten content should be less than 1% and for optimum results the tungsten content should be less than 0.1%, and preferably the alloy is tungsten-free.
  • the inclusion of manganese in amounts up to about 2% further enhances the oxidation resistance.
  • a particularly preferred alloy compositional range in accordance with the present invention is as follows:
  • a specific preferred alloy composition is 20% Cr, 0.3 Si, 0.1% La, 0.5% Mn, Ni, balance Co.
  • the alloy of the present invention can contain minor amounts of elements ordinarily present in commercial cobalt base alloys.
  • iron can be present up to about 10% and molybdenum up to about 1%, however it is preferred that the alloy be essentially free of molybdenum.
  • the isothermal tests involved exposing alloy samples to flowing dry air at a constant temperature and recording the weight gain of the samples as a function of time.
  • the samples were in the form of hot rolled sheet 2 mm. thick. Before testing the samples were solution treated for one hour at 1080 C. in argon and quenched in brine.
  • compositions of the alloys are shown in Table I below:
  • the mechanical properties of the alloy of the present invention shows its suitability as a matrix metal for composite materials.
  • An alloy in accordance with claim 1 containing up to 2% manganese by weight and less than 1% each of tungsten and molybdenum by weight.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Soft Magnetic Materials (AREA)
  • Heat Treatment Of Steel (AREA)
  • Powder Metallurgy (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
US773149A 1968-11-04 1968-11-04 Cobalt base oxidation resistant alloy Expired - Lifetime US3591371A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US77314968A 1968-11-04 1968-11-04

Publications (1)

Publication Number Publication Date
US3591371A true US3591371A (en) 1971-07-06

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ID=25097348

Family Applications (1)

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US773149A Expired - Lifetime US3591371A (en) 1968-11-04 1968-11-04 Cobalt base oxidation resistant alloy

Country Status (11)

Country Link
US (1) US3591371A (nl)
AT (1) AT296635B (nl)
BE (1) BE741042A (nl)
BR (1) BR6913788D0 (nl)
CA (1) CA918459A (nl)
DE (2) DE1966758A1 (nl)
FR (1) FR2022561A1 (nl)
GB (1) GB1250382A (nl)
LU (1) LU59746A1 (nl)
NL (1) NL6916456A (nl)
SE (1) SE343890B (nl)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4169726A (en) * 1977-12-21 1979-10-02 General Electric Company Casting alloy and directionally solidified article
US4735771A (en) * 1986-12-03 1988-04-05 Chrysler Motors Corporation Method of preparing oxidation resistant iron base alloy compositions
WO1989009843A1 (en) * 1988-04-04 1989-10-19 Chrysler Motors Corporation Oxidation resistant iron base alloy compositions
US4891183A (en) * 1986-12-03 1990-01-02 Chrysler Motors Corporation Method of preparing alloy compositions
US4999158A (en) * 1986-12-03 1991-03-12 Chrysler Corporation Oxidation resistant iron base alloy compositions

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2420684A1 (fr) * 1978-03-21 1979-10-19 Pavec Albert Perfectionnements apportes aux ecrous-inserts et dispositif de pose s'y rapportant
US4764225A (en) * 1979-05-29 1988-08-16 Howmet Corporation Alloys for high temperature applications
US4339509A (en) 1979-05-29 1982-07-13 Howmet Turbine Components Corporation Superalloy coating composition with oxidation and/or sulfidation resistance

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4169726A (en) * 1977-12-21 1979-10-02 General Electric Company Casting alloy and directionally solidified article
US4735771A (en) * 1986-12-03 1988-04-05 Chrysler Motors Corporation Method of preparing oxidation resistant iron base alloy compositions
WO1989009841A1 (en) * 1986-12-03 1989-10-19 Chrysler Motors Corporation Method of preparing oxidation resistant iron base alloy compositions
US4891183A (en) * 1986-12-03 1990-01-02 Chrysler Motors Corporation Method of preparing alloy compositions
US4999158A (en) * 1986-12-03 1991-03-12 Chrysler Corporation Oxidation resistant iron base alloy compositions
WO1989009843A1 (en) * 1988-04-04 1989-10-19 Chrysler Motors Corporation Oxidation resistant iron base alloy compositions

Also Published As

Publication number Publication date
DE1966758A1 (de) 1974-03-21
LU59746A1 (nl) 1970-05-13
NL6916456A (nl) 1970-05-08
CA918459A (en) 1973-01-09
DE1953025A1 (de) 1970-05-27
AT296635B (de) 1972-02-25
FR2022561A1 (nl) 1970-07-31
GB1250382A (nl) 1971-10-20
BR6913788D0 (pt) 1973-04-05
SE343890B (nl) 1972-03-20
DE1953025C3 (de) 1975-02-27
DE1953025B2 (de) 1974-07-04
BE741042A (nl) 1970-04-30

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Legal Events

Date Code Title Description
AS Assignment

Owner name: HAYNES INTERNATINAL, INC.,INDIANA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CABOT CORPORATION;REEL/FRAME:004770/0271

Effective date: 19870731

Owner name: HAYNES INTERNATINAL, INC., 1020 WEST PARK AVENUE,

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:CABOT CORPORATION;REEL/FRAME:004770/0271

Effective date: 19870731