EP0186797B1 - Novel cobalt-base superalloy and cast and welded industrial gas turbine components thereof - Google Patents
Novel cobalt-base superalloy and cast and welded industrial gas turbine components thereof Download PDFInfo
- Publication number
- EP0186797B1 EP0186797B1 EP85115301A EP85115301A EP0186797B1 EP 0186797 B1 EP0186797 B1 EP 0186797B1 EP 85115301 A EP85115301 A EP 85115301A EP 85115301 A EP85115301 A EP 85115301A EP 0186797 B1 EP0186797 B1 EP 0186797B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cobalt
- gas turbine
- superalloy
- industrial gas
- base superalloy
- 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
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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
- C22C19/07—Alloys based on nickel or cobalt based on cobalt
Definitions
- Cobalt-base superalloys having special utility in the production of industrial gas turbine hot gas path components because of their unique combination or properties including excellent hot corrosion resistance, creep rupture strength at high temperature, metallurgical stability, tensile ductility and weldability, are comprised of 0.3 to 0.6% carbon, 27-35% chromium, 9-16% nickel, 6-9% tungsten, 0.45 to 2.0% tantalum, up to 3.0% hafnium, up to 0.1 % niobium, up to 0.7% zirconium, not more than 2.0% iron, 1.5% manganese and silicon and 0.05% boron, balance cobalt and impurities, the carbide formers being selected to satisfy the following equation:
- This invention relates generally to the superalloy branch of the metallurgical art, and is more specifically concerned with new cobalt-base superalloys having an unique combination of properties and consequent special utility in the production of both cast articles and welded structures, and with novel industrial gas turbine hot gas path components of those new alloys.
- Cobalt-base superalloys disclosed and claimed in US-A-3,383,205 have superior oxidation and hot corrosion resistance and as a consequence have long been used extensively in commercial production of industrial gas turbine nozzles.
- one of those superalloys is the current first stage nozzle alloy of the Gas Turbine Division of General Electric Company, the assignee hereof.
- the creep rupture and fatigue strength of that alloy are marginal for new industrial gas turbine nozzle applications and in recognition of that fact, a program was launched to improve those properties without significantly diminishing the resistance of the superalloys either to oxidation or to hot corrosion.
- the present invention is a cobalt-base superalloy having an unique combination of properties at high temperature and consequent special utility in the production of industrial gas turbine hot gas path components, which alloy is comprised of 0.3-0.6% carbon, 27-35% chromium, 9-16% nickel, 6-9% tungsten, up to 3% hafnium, .45-2.0% tantalum, up to .7% zirconium, up to .5% titanium, up to 1 % niobium, manganese and silicon, up to .05% boron, up to 2.0% iron, remainder cobalt plus impurities.
- An additional important requirement is that the carbide-forming elements be so selected as to satisfy the relationship stated above and represented by the following equation:
- the present invention is a cast cobalt-base superalloy industrial gas turbine nozzle consisting of the new alloy set forth immediatley above. Also, in this aspect the invention takes the form of transition pieces and shrouds, and of a fabricated cobalt-base superalloy gas turbine combustion chamber comprising a plurality of sheets of the said new alloy rolled and formed in predetermined shape and assembled and welded together.
- the chromium content of these alloys is preferably targeted at 28-30% in recognition that departures in each direction can penalize alloy properties, specifically amounts less than about 27% result in loss of oxidation and hot corrosion resistance and amounts greater than about 35% result in loss of ductility without offsetting gain in either oxidation resistance or hot corrosion resistance.
- the cast and fabricated bodies of this invention being components of industrial gas turbines are quite different from aircraft jet engine components especially in respect to size and mass. Because of this, they represent problems unlike those of the relatively lighter weight counterparts such as marked cracking tendency associated with welding operations. This has significant implication for cast as well as fabricated industrial gas turbine components as it would obviously be highly desirable to be able to weld repair industrial gas turbine nozzles to avoid the time and expense of replacement. Gaining this advantage without forfeiting any other constitutes an important advance in the art. Likewise, the opportunity to build industrial gas turbine combustion chamber structures by welding preformed sheets or plates together which is enabled as a result of this invention, its alloys having excellent weldability, is an important new advance in the production of industrial gas turbines. In our practice of such welding operations as these we prefer to use the gas tungsten arc technique and equipment in general use in industry in the fabrication of both ferrous and nonferrous metal structures, including those of cobalt-base superalloys.
- the first stage nozzle 10 of an industrial gas turbine shown in Fig. 1 is a casting of our preferred alloy composition produced by the injection molding and investment casting technique in general use in the art. Also, the shape and size and the design details of nozzle 10 essentially duplicate those features of the present standard first stage nozzle. Transition piece 20 similarly resembles that which has long been in general use in industrial gas turbines differing importantly, however, in that it is constructed of parts of an alloy of this invention welded together to provide a strong crack-free assembly of integrally bonded elements. Thus, bracket 22 is fitted in place on body 23 and welded securely and fixed tightly thereto.
- the superalloys of this invention (Examples II and Example IIIC) have ultimate tensile strengths equal to or better than the commercial superalloy of Example I and have creep rupture strength substantially greater than that commercial superalloy. Further it is apparent from Table I that these new superalloys have good room temperature tensile elongation characteristics and as Table II shows and Fig. 3 graphically illustrates, the weldability of the superalloys of this invention is superior to commercial superalloys A and E and even spectacularly so in the case of the superalloy of Example II which as indicated above is our present preferred embodiment of the invention.
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)
- Materials For Medical Uses (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US67811884A | 1984-12-04 | 1984-12-04 | |
US678118 | 1984-12-04 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0186797A1 EP0186797A1 (en) | 1986-07-09 |
EP0186797B1 true EP0186797B1 (en) | 1989-06-21 |
Family
ID=24721479
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP85115301A Expired EP0186797B1 (en) | 1984-12-04 | 1985-12-03 | Novel cobalt-base superalloy and cast and welded industrial gas turbine components thereof |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0186797B1 (ja) |
JP (1) | JPS61149450A (ja) |
CN (1) | CN1011984B (ja) |
DE (1) | DE3571146D1 (ja) |
IN (1) | IN164571B (ja) |
NO (1) | NO166542C (ja) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2769024A1 (fr) * | 1997-09-29 | 1999-04-02 | Saint Gobain Isover | Alliage a base de cobalt, article realise a partir de l'alliage et son procede de fabrication |
US8252376B2 (en) * | 2001-04-27 | 2012-08-28 | Siemens Aktiengesellschaft | Method for restoring the microstructure of a textured article and for refurbishing a gas turbine blade or vane |
DE602004022327D1 (de) | 2003-11-25 | 2009-09-10 | Kyocera Corp | Keramisches heizelement und herstellungsverfahren dafür |
US6983599B2 (en) * | 2004-02-12 | 2006-01-10 | General Electric Company | Combustor member and method for making a combustor assembly |
US20070017906A1 (en) * | 2005-06-30 | 2007-01-25 | General Electric Company | Shimmed laser beam welding process for joining superalloys for gas turbine applications |
CN102021558B (zh) * | 2009-09-09 | 2012-07-11 | 沈阳大陆激光技术有限公司 | 用于循环流化床锅炉水冷壁管激光熔覆涂层的合金粉末 |
CN108070742A (zh) * | 2016-11-15 | 2018-05-25 | 中国科学院金属研究所 | 一种燃气轮机导向叶片用钴基高温合金及其制备方法和应用 |
EP4000767A1 (en) * | 2018-11-06 | 2022-05-25 | Hamilton Sundstrand Corporation | Cold spray forming |
EP3677697A1 (en) * | 2019-01-07 | 2020-07-08 | Siemens Aktiengesellschaft | Co-alloy for additive manufacturing and method |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB891550A (en) * | 1959-08-28 | 1962-03-14 | Sierra Metals Corp | Metal alloys |
US3383205A (en) * | 1964-12-14 | 1968-05-14 | Gen Electric | Cobalt base alloys |
US3549356A (en) * | 1969-01-06 | 1970-12-22 | Gen Electric | High temperature corrosive resistant cobalt-base alloys |
US3582320A (en) * | 1969-12-22 | 1971-06-01 | Robert B Herchenroeder | Cobalt base alloy |
US3933484A (en) * | 1974-05-31 | 1976-01-20 | Owens-Corning Fiberglas Corporation | Cobalt-base alloy |
JPS5582741A (en) * | 1978-12-15 | 1980-06-21 | Hitachi Ltd | High-strength high-toughness cobalt alloy |
JPS5582743A (en) * | 1978-12-15 | 1980-06-21 | Hitachi Ltd | High-strength high-toughness cobalt alloy |
JPS5582744A (en) * | 1978-12-15 | 1980-06-21 | Hitachi Ltd | High-strength high-toughness cobalt alloy |
-
1985
- 1985-11-14 CN CN85109085A patent/CN1011984B/zh not_active Expired
- 1985-11-18 IN IN818/CAL/85A patent/IN164571B/en unknown
- 1985-11-28 JP JP60266298A patent/JPS61149450A/ja active Granted
- 1985-12-03 DE DE8585115301T patent/DE3571146D1/de not_active Expired
- 1985-12-03 EP EP85115301A patent/EP0186797B1/en not_active Expired
- 1985-12-03 NO NO854859A patent/NO166542C/no unknown
Also Published As
Publication number | Publication date |
---|---|
JPS61149450A (ja) | 1986-07-08 |
CN85109085A (zh) | 1986-08-20 |
JPH0459378B2 (ja) | 1992-09-22 |
NO166542C (no) | 1991-08-07 |
EP0186797A1 (en) | 1986-07-09 |
NO166542B (no) | 1991-04-29 |
NO854859L (no) | 1986-06-05 |
CN1011984B (zh) | 1991-03-13 |
DE3571146D1 (en) | 1989-07-27 |
IN164571B (ja) | 1989-04-15 |
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