US3027254A - Nickel-cobalt base alloys - Google Patents

Nickel-cobalt base alloys Download PDF

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Publication number
US3027254A
US3027254A US807780A US80778059A US3027254A US 3027254 A US3027254 A US 3027254A US 807780 A US807780 A US 807780A US 80778059 A US80778059 A US 80778059A US 3027254 A US3027254 A US 3027254A
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US
United States
Prior art keywords
nickel
alloy
ratio
cobalt base
percent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US807780A
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English (en)
Inventor
Malerich Jerome Benedict
Wilde Robert Francis
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.)
General Electric Co
Original Assignee
General Electric Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by General Electric Co filed Critical General Electric Co
Priority to US807780A priority Critical patent/US3027254A/en
Priority to GB12205/60A priority patent/GB907208A/en
Priority to BE589492A priority patent/BE589492A/fr
Priority to CH434760A priority patent/CH403306A/de
Application granted granted Critical
Publication of US3027254A publication Critical patent/US3027254A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • C22C19/056—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

  • This invention relates to nickel-cobalt base alloys suitable for casting, particularly unique in improved elevated temperature ductility and impact strength.
  • a principal object of our invention is to provide a casting alloy having suitable strength characteristics for elevated temperature applications under stress conditions and including greater ductility and impact strength properties than currently available cast alloys.
  • Another object is to provide a nickel-cobalt alloy ineluding a balance of aluminum, titanium, carbon, mlybdenum and iron to provide ductility in a casting usually found in wrought articles.
  • Our alloy in one form comprises in percent by weight about 0.10-0.16 carbon, about 2-2.5 titanium, about 3.5-4 aluminum, about 4-5 molybdenum, about 14-16 chromium, about 26-28 cobalt, up to about 2 iron, about .01-.02 boron, with the balance essentially nickel, impurities, and the usual small quantities of manganese and silicon.
  • our alloy include in percent by weight a maximum of about 0.2 manganese and a maximum of about 0.3 silicon.
  • Our alloy features excellent ductility and impact strength principally as a result of a balance between the alloying of titanium, aluminum, iron, molybdenum and carbon with a nickel-cobalt base including chromium.
  • the ductility and impact strength is maintained at a superior level if the Al/Ti ratio is at about 2 or below, at the same time as the Ti/ C ratio is maintained at about 16 or below and the Mo/Fe ratio is about 2.5 or greater.
  • our alloy As a casting alloy because it displays excellent stress rupture strength inherent in castings over that of wrought materials. For example, in the range of about A our alloy exhibits average 100 hours stress rupture life at 1350 F. of 68,000 pounds per square inch, at 1500 F. of 46,000 pounds per square inch and at 1650 F. of 28,000 pounds per square inch. However our alloy has the ductility for engineering applications generally only obtainable in wrought materials.
  • tensile ductility In order to determine the ductility, sometimes referred to as tensile ductility, of our alloy in its broad range, we conducted a series of tensile tests from which may be calculated the ultimate tensile strength, referred to in the tables as U.T.S., percent elongation and percent reduction in area. Ultimate tensile strength" is the value in pounds per square inch obtained when the maximum load recorded during the straining of a specimen is divided by the cross sectional area of the specimen before straining. Tensile ductility is the measure of the permanent deformation before fracture by stress when the specimen is in tension.
  • Percent elongation may be defined as the amount of permanent extension in the vicinity of the fracture during a tensile test expressed as percentage of the originally gage length; the percentage reduction in area, shown as percent R.A. in the tables, may be defined as the percentage difference between the original cross sectional area and that of the smallest area at the point of rupture of a test specimen.
  • Table 1 represents average and maximum tensile data for a large number of specimens tested having grains sizes up to about A Our alloy was cast directly into the 0.250 inch diameter test specimens size and had a grain size range of about to inch. The gauge length of the test specimens upon which the following elongation values were based was 1 inch.
  • Another measure of ductility of an alloy is an impact test conducted to determine the energy, usually measured in foot pounds, absorbed in fracturing a test bar.
  • the impact test which we used was a standard A.S.T.M. V notch Charpy impact test performed on a test bar cantilevered at both ends and including a notch in one face. The bar is impacted on the side opposite the notch by a falling weight possessing a potential energy of about 117 foot pounds.
  • Table III compares these essential elements in some other cast alloys, the impact strengths of which we tested with our alloy.
  • a nickel-cobalt base cast alloy comprising in percent by weight about 0.10-0.16 carbon, about 2-2.5 titanium, about 3.5-4.0 aluminum, about 4-5 molybdenum, about 14-16 chromium, about 26-28 cobalt, up to about 2 iron, about 0.01-0.02 boron, with the balance essentially nickel and impurities and having an Al/ Ti ratio of about 2 or below, a Ti/ C ratio of about 16 or below and Mo/Fe of at least about 2.5.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Materials For Medical Uses (AREA)
  • Ceramic Products (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Manufacture And Refinement Of Metals (AREA)
US807780A 1959-04-21 1959-04-21 Nickel-cobalt base alloys Expired - Lifetime US3027254A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US807780A US3027254A (en) 1959-04-21 1959-04-21 Nickel-cobalt base alloys
GB12205/60A GB907208A (en) 1959-04-21 1960-04-06 Improvements in or relating to nickel-cobalt base alloys
BE589492A BE589492A (fr) 1959-04-21 1960-04-07 Alliages à base de nickel et de cobalt
CH434760A CH403306A (de) 1959-04-21 1960-04-19 Nickel-Kobalt-Legierung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US807780A US3027254A (en) 1959-04-21 1959-04-21 Nickel-cobalt base alloys

Publications (1)

Publication Number Publication Date
US3027254A true US3027254A (en) 1962-03-27

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US807780A Expired - Lifetime US3027254A (en) 1959-04-21 1959-04-21 Nickel-cobalt base alloys

Country Status (4)

Country Link
US (1) US3027254A (de)
BE (1) BE589492A (de)
CH (1) CH403306A (de)
GB (1) GB907208A (de)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2688536A (en) * 1951-01-27 1954-09-07 Gen Motors Corp High-temperature creep resistant alloy
CA548778A (en) * 1957-11-12 The International Nickel Company Of Canada Nickel-base heat-resistant alloy

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA548778A (en) * 1957-11-12 The International Nickel Company Of Canada Nickel-base heat-resistant alloy
US2688536A (en) * 1951-01-27 1954-09-07 Gen Motors Corp High-temperature creep resistant alloy

Also Published As

Publication number Publication date
BE589492A (fr) 1960-08-01
CH403306A (de) 1965-11-30
GB907208A (en) 1962-10-03

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