EP0053948B1 - Legierungen auf Nickel-Chrom-Kobalt-Basis und daraus hergestellte Gussstücke - Google Patents

Legierungen auf Nickel-Chrom-Kobalt-Basis und daraus hergestellte Gussstücke Download PDF

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Publication number
EP0053948B1
EP0053948B1 EP81305828A EP81305828A EP0053948B1 EP 0053948 B1 EP0053948 B1 EP 0053948B1 EP 81305828 A EP81305828 A EP 81305828A EP 81305828 A EP81305828 A EP 81305828A EP 0053948 B1 EP0053948 B1 EP 0053948B1
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EP
European Patent Office
Prior art keywords
alloys
chromium
nickel
castings
hafnium
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
Application number
EP81305828A
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English (en)
French (fr)
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EP0053948A1 (de
Inventor
Stuart Walter Ker Shaw
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.)
Inco Europe Ltd
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Inco Europe Ltd
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 Inco Europe Ltd filed Critical Inco Europe Ltd
Priority to AT81305828T priority Critical patent/ATE9598T1/de
Publication of EP0053948A1 publication Critical patent/EP0053948A1/de
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Publication of EP0053948B1 publication Critical patent/EP0053948B1/de
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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
    • C22C19/03—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%

Definitions

  • This invention relates to improved castable nickel-chromium-cobalt base alloys and castings of these alloys.
  • Nickel-chromium and nickel-chromium-cobalt base alloys containing titanium and aluminium develop, on suitable heat-treatment, a high level of creep-rupture strength at high temperatures and are widely used in applications giving rise to high stress at elevated temperatures, such as gas turbine engine rotor blades and vanes.
  • impure fuels such as diesel oil in land-based and marine propulsion turbines gives rise to sulphidation attack. Operation in marine and other chloride-containing environments also results in severe corrosion problems.
  • alloys that exhibit this combination of properties and contain from 0.02 to 0.25% carbon, from 20 to 25% chromium, from 5 to 25% cobalt, one or both of molybdenum (up to 3.5%) and tungsten (up to 5%) in such amounts that the value of %W+0.5 (%Mo) is from 0.5 to 5%, from 1.7 to 5% titanium and from 1 to 4% aluminium, with the provisos that the sum of the aluminium and titanium contents is from 4 to 7% and the ratio of titanium to aluminium is from 0.75:1 to 4:1, from 0.5 to 3% tantalum, from 0 to 3% niobium, from 0.005 to 1.0% zirconium and from 0 to 1.99% hafnium, with the proviso that the value of %Zr+0.5 (%Hf) is from 0.01 to 1%, from 0.001 to 0.05% boron, and from 0 to 0.2% in total of yt
  • the present invention is based on the discovery that by means of a special correlation of the contents of titanium, aluminium, niobium and hafnium in a range of alloy compositions that also contain nickel, chromium, cobalt, tungsten (with or without molybdenum), tantalum, carbon, boron and zirconium, the creep-rupture life of castings of the alloys, particular in the directionally-solidified form, can be further substantially increased.
  • nickel-chromium-cobalt alloys contain from 20 to 23% chromium, form 17 to 23% cobalt, from 1 to 2.5% tungsten, from 0 to 0.5% molybdenum, from 0.4 to 1.2% niobium, from 0.6 to 1.4% tantalum, from 2.95 to 3.85% titanium, from 1.6 to 2.8% aluminium, from 0.3 to 1.3% hafnium, from 0.005 to 1% zirconium, from 0.001 to 1% boron, and from 0.01 to 0.25% carbon, the balance part from impurities, being nickel, with the proviso that the contents of niobium, hafnium, titanium and aluminium (in wt. % of the alloy) are so correlated that they satisfy the expression:
  • boron and carbon preferably lie within the narrower ranges 0.005 - 0.15% zirconium, 0.002-0.02% boron and 0.05 to 0.20% carbon though smaller amounts of carbon and boron may be present in single-crystal castings where their contribution to grain-boundary strengthening is not required.
  • the alloys of the invention in the directionally-solidified form and after solution-heating and ageing, may exhibit creep-rupture lives in excess of 1600 hours, at 200 N/mm 2 and 870°C.
  • impurities that may be present include small amounts of silicon, manganese and iron, though these should be kept as low as possible.
  • the silicon content should not exceed 1 %, and preferably is less than 0.5%, most preferably not more than 0.2%, as it impairs the corrosion resistance.
  • Manganese should be less than 1%, and is preferably not more than 0.2%.
  • the iron content may be as much as 3%, but is preferably not more than 0.5%. Traces of nitrogen and sulphur may also be present, but preferably not more than 0.005% each.
  • a preferred alloy according to the invention has the normal composition:
  • the Correlation Factor calculated for this composition is 153 855.
  • vacuum refining e.g. by holding under vacuum for from 15 minutes to 1 hour.
  • the cast stick or other initial form should be remelted and cast under vacuum.
  • the alloys have good castability and are particularly suitable for the production of cast shaped articles and parts.
  • the castings are preferably directionally solidified to obtain a columnar crystal structure, but the invention specifically includes shaped castings made from the alloys both with substantially equiaxed and with columnar crystal structures.
  • Such castings include parts of gas turbine engines, for example gas turbine rotor or stator blades, both with and without cooling passages, and integrally bladed turbine rotor discs.
  • Directional solidication may be effected in any manner conventionally employed for high-temperature alloys.
  • the castings must be subjected to a heat-treatment comprising solution-heating and ageing.
  • the solution-heating preferably consists in heating for from 2 to 24 hours at from 1120 to 1200°C, and is followed by ageing in the temperature range from 1020 to 650°C for from 2 to 24 hours.
  • the ageing may be effected in a single stage, or in two stages, e.g. from 2 to 12 hours at 1020 ⁇ 870°C and then from 6 to 48 hours at 860 ⁇ 650°C.
  • Suitable heat treatments are:
  • the alloy may be air-cooled.
  • test pieces were then subjected to creep-rupture tests under a stress of 200 N/mm 2 at 870°C, with the results set out in Table II, which also includes the Correlation Factor calculated from the alloy compositions.
  • the alloys may also be useful in the wrought forms. They may be used to produce single crystal castings, for example single-crystal gas turbine blades or vanes. If heat-treated in vacuum, they may be rapidly quenched after each stage of heating by gas fan quenching.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Laminated Bodies (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Mold Materials And Core Materials (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)

Claims (5)

1. Eine Nickel-Chrom-Kobalt-Legierung, die dadurch gekennzeichnet ist, daß sie folgende Gehalte (in Gew.-%) aufweist: 20 bis 23% Chrom, 17 bis 23% Kobalt, 1 bis 2,5% Wolfram, 0 bis 0,5% Molybdän, 0,4 bis 1,2% Niob, 0,6 bis 1,4% Tantal, 2,95 bis 3,85% Titan, 1,6 bis 2,8% Aluminium, 0,3 bis 1,3% Hafnium, 0,005 bis 1 % Zirkon, 0,001 bis 1% Bor und 0,01 bis 0,25% Kohlenstoff, der Restgehalt, mit Ausnahme von Verunreinigungen (einschließlich weniger als 1 % Si, weniger als 1 % Mn und weniger als 3% Fe) ist Nickel, wobei die Gehalte (in Gew.%) von Niob, Hafnium, Titan und Aluminium so miteinander in Wechselbeziehung stehen, daß sich folgender Ausdruck (Korrelationsfaktor) ergibt:
28327 Nb+804 Hf+36956 Ti+115057 AI
-6676 Nb2-564 Hf2-4847 Ti2-54349 Al2
+8392 Al3-5255 (NbxTi)≥153123.
2. Eine Legierung gemäß Anspruch 1, deren Kohlenstoffgehalt 0,05 bis 0,20%, Zirkongehalt, 0,005 bis 0,15% und Borgehalt 0,002 bis 0,02% beträgt.
3. Eine Leigierung gemäß Anspruch 1 oder 2, bei welcher der Korrelationsfaktor mindestens 1 53223 beträgt.
4. Eine Legierung gemäß Anspruch 1 mit folgenden Gehalten: Etwa 22% Chrom, etwa 19% Kobalt, etwa 2% Wolfram, etwa 1,1% Tantal, etwa 3,4% Titan, etwa 0,8% Niob, etwa 0,7% Hafnium, etwa 2% Aluminium, etwa 0,15% Kohlenstoff, etwa 0,1% Zirkon und etwa 0,01% Bor; Rest (mit Ausnahme von Verunreinigungen) Nickel.
5. Ein aus einer Legierung gemäß irgendeinem der obigen Ansprüche hergestelltes Gußstück mit gerichteter Erstarrung.
EP81305828A 1980-12-10 1981-12-10 Legierungen auf Nickel-Chrom-Kobalt-Basis und daraus hergestellte Gussstücke Expired EP0053948B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81305828T ATE9598T1 (de) 1980-12-10 1981-12-10 Legierungen auf nickel-chrom-kobalt-basis und daraus hergestellte gussstuecke.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8039492 1980-12-10
GB8039492 1980-12-10

Publications (2)

Publication Number Publication Date
EP0053948A1 EP0053948A1 (de) 1982-06-16
EP0053948B1 true EP0053948B1 (de) 1984-09-26

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ID=10517874

Family Applications (1)

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EP81305828A Expired EP0053948B1 (de) 1980-12-10 1981-12-10 Legierungen auf Nickel-Chrom-Kobalt-Basis und daraus hergestellte Gussstücke

Country Status (5)

Country Link
EP (1) EP0053948B1 (de)
JP (1) JPS57123950A (de)
AT (1) ATE9598T1 (de)
CA (1) CA1202505A (de)
DE (1) DE3166370D1 (de)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61119640A (ja) * 1984-11-16 1986-06-06 Honda Motor Co Ltd 排気バルブ用合金
US4810467A (en) * 1987-08-06 1989-03-07 General Electric Company Nickel-base alloy
US20050069450A1 (en) * 2003-09-30 2005-03-31 Liang Jiang Nickel-containing alloys, method of manufacture thereof and articles derived thereform
US10041153B2 (en) 2008-04-10 2018-08-07 Huntington Alloys Corporation Ultra supercritical boiler header alloy and method of preparation
CN102398171A (zh) * 2010-09-16 2012-04-04 上海胜僖汽车配件有限公司 一种汽车零配件加工夹具
US20160326613A1 (en) * 2015-05-07 2016-11-10 General Electric Company Article and method for forming an article
CN114921687B (zh) * 2022-04-25 2023-07-04 西安工业大学 通过调控锆和碳组分含量制备的改性的高温合金及方法
CN115094288A (zh) * 2022-04-25 2022-09-23 西北工业大学 通过调控碳组分含量制备的改性的高温合金及方法
CN114921706B (zh) * 2022-04-25 2023-08-01 西北工业大学 改性的镍基铸造高温合金及制备方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB607616A (en) * 1945-11-28 1948-09-02 Harold Ernest Gresham Nickel base alloy
FR1071278A (fr) * 1951-12-05 1954-08-30 Mond Nickel Co Ltd Perfectionnements aux alliages résistant à la chaleur et objets et pièces fabriqués à partir desdits alliages
GB1036179A (en) * 1964-07-13 1966-07-13 Wiggin & Co Ltd Henry Heat treatment of nickel-chromium alloys
GB1298942A (en) * 1969-03-07 1972-12-06 Int Nickel Ltd Nickel-chromium-cobalt alloys
GB1367661A (en) * 1971-04-07 1974-09-18 Int Nickel Ltd Nickel-chromium-cobalt alloys
GB1484521A (en) * 1975-07-17 1977-09-01 Inco Europ Ltd Nickel-chromium-cobalt alloys
JPS558550A (en) * 1978-07-04 1980-01-22 Mitsubishi Heavy Ind Ltd Pulling out apparatus for tube of heat exchanger

Also Published As

Publication number Publication date
EP0053948A1 (de) 1982-06-16
ATE9598T1 (de) 1984-10-15
CA1202505A (en) 1986-04-01
JPS57123950A (en) 1982-08-02
DE3166370D1 (en) 1984-10-31
JPH028016B2 (de) 1990-02-22

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