Chromium Containing Patents (Class 148/410)
  • Patent number: 5516381
    Abstract: A rotating blade or stationary vane of a gas turbine which is made of a nickel alloy containing Cr, Co, Mo, W, Ta, Al, Ti, C, B, Zr, and one or both of Mg and Ca. Additionally, the alloy may contain Hf, Pt, Rh and Re.
    Type: Grant
    Filed: January 25, 1995
    Date of Patent: May 14, 1996
    Assignees: Mitsubishi Materials Corporation, Mitsubishi Jukogyo Kabushiki Kaisha
    Inventors: Hisataka Kawai, Ikuo Okada, Ichiro Tsuji, Koji Takahashi, Kensho Sahira, Akira Mitsuhashi
  • Patent number: 5482789
    Abstract: The present invention provides a nickel base superalloy having an improved combination of stress rupture life and microstructural stability with respect to the formation of TCP phases. A unique feature is the specific combination of the content of elements consisting of Al, Ti and W in a second range defined by their sum in a nickel base superalloy having high contents of rhenium, in excess of 1.3 atomic percent (about 4.0 weight percent) to lower the propensity for TCP phase formation and thus render the alloy more stable at high temperatures. The interaction of Ru with the remaining elements to modify the refractory element phase partitioning provides unique capabilities, causing elements to partition to the gamma phase or the gamma prime phase in a reverse direction than normally experienced in Ni-base superalloys. These Ni-base superalloys are termed Ru-containing Reverse Partitioning Ni-base Superalloys.
    Type: Grant
    Filed: January 3, 1994
    Date of Patent: January 9, 1996
    Assignee: General Electric Company
    Inventors: Kevin S. O'Hara, William S. Walston, Earl W. Ross, Ramgopal Darolia
  • Patent number: 5476555
    Abstract: This invention relates to nickel-cobalt based alloys comprising the following elements in percent by weight: from about 0.002 to about 0.07 percent carbon, from about 0 to about 0.04 percent boron, from about 0 to about 2.5 percent columbium, from about 12 to about 19 percent chromium, from about 0 to about 6 percent molybdenum, from about 20 to about 35 percent cobalt, from about 0 to about 5 percent aluminum, from about 0 to about 5 percent titanium, from about 0 to about 6 percent tantalum, from about 0 to about 6 percent tungsten, from about 0 to about 2.5 percent vanadium, from about 0 to about 0.06 percent zirconium, and the balance nickel plus incidental impurities, the alloys having a phasial stability number N.sub.v3B less than about 2.60. Furthermore, the alloys have at least one element selected from the group consisting of aluminum, titanium, columbium, tantalum and vanadium. Also, the alloys have at least one element selected from the group consisting of tantalum and tungsten.
    Type: Grant
    Filed: March 2, 1993
    Date of Patent: December 19, 1995
    Assignee: SPS Technologies, Inc.
    Inventor: Gary L. Erickson
  • Patent number: 5470371
    Abstract: Articles having improved strength at high temperature are made from near-eutectic nickel-base superalloys. In such alloys, the improved properties are achieved by preventing the formation of a dispersed second phase during the production of alloy powder. After the powder is consolidated, a dispersion of the second phase is developed through thermal treatment. Consolidation may be achieved by direct application of pressure, or by incremental solidification processes. Some of these alloys are formulated to achieve additional strengthening by precipitation hardening.
    Type: Grant
    Filed: March 12, 1992
    Date of Patent: November 28, 1995
    Assignee: General Electric Company
    Inventor: Ramgopal Darolia
  • Patent number: 5460664
    Abstract: A nickel-based alloy useful in the manufacture of a glass fibre centrifuge of which the composition consists essentially of the following elements expressed as percentage by weight:______________________________________ Cr 27.5-29.5% W 6.5-7.8% C 0.69-0.73% Fe 7-10% ______________________________________the remainder substantially being nickel and having in its crystalline structure M.sub.23 C.sub.6 type carbides, M being chromium, at least one equivalent metal, or combination thereof, the M.sub.23 C.sub.6 carbides being substantially secondary.
    Type: Grant
    Filed: April 12, 1994
    Date of Patent: October 24, 1995
    Assignee: Isover Saint-Gobain
    Inventor: Stella Vasseur
  • Patent number: 5455120
    Abstract: A nickel base superalloy capable of being made into a single crystal article is provided with high temperature strength and improved stability by limiting the presence of an undesirable SRZ constituent. Significant to the control of formation of such undesirable constituents is the control of the amount of Re in the alloy in combination with elements such as Al, Cr, Ta, Mo, Co and W. A solution heat treatment is provided for additional control.
    Type: Grant
    Filed: July 29, 1993
    Date of Patent: October 3, 1995
    Assignee: General Electric Company
    Inventors: William S. Walston, Earl W. Ross, Tresa M. Pollock, Kevin S. O'Hara, Wendy H. Murphy
  • Patent number: 5431750
    Abstract: The improved nickel-base heat-resistant alloy consists of 13.1-15.0% Cr (all percentages that follows are by weight), 8.5-10.5% Co, 1.0-3.5% Mo, 3.5-4.5% W, 3.0-5.5% Ta, 3.5-4.5% Al, 2.2-3.2% Ti, 0.06-0.12% C, 0.005-0.025% B, 0.010-0.05% Zr and 1-100 ppm of Mg and/or Ca, in the optional presence of 0-1.5% Hf and/or 0-0.5% of at least one element of Pt, Rh and Re, with the remainder being Ni and incidental impurities. The alloy has high strength and high resistance to oxidation and corrosion at elevated temperatures and, hence, is suitable for use as a constituent material for machine parts that are to be exposed to elevated temperatures.
    Type: Grant
    Filed: June 19, 1992
    Date of Patent: July 11, 1995
    Assignees: Mitsubishi Materials Corporation, Mitsubishi Jukogyo Kabushiki Kaisha
    Inventors: Hisataka Kawai, Ikuo Okada, Ichiro Tsuji, Koji Takahashi, Kensho Sahira, Akira Mitsuhashi
  • Patent number: 5419869
    Abstract: An Ni--Cr--W base alloy having superior creep strength and excellent corrosion resistance consists essentially of: by weight 21 to 25% of Cr, 18 to 25% of W, 0.5 to 2.0% Ti, 1 to 5% of Al, between zero and 0.2% of B, 0.025 to 0.5% of C, between zero and 0.3% of Zr and 0.3 to 3.0% of Ta, the balance being substantially Ni.
    Type: Grant
    Filed: December 15, 1993
    Date of Patent: May 30, 1995
    Assignee: Korea Institute of Science and Technology
    Inventors: Ju Choi, Hyon T. Kim
  • Patent number: 5413876
    Abstract: Weldable nickel aluminide alloys which are essentially free, if not entirely free, of weld hot cracking are provided by employing zirconium concentrations in these alloys of greater than 2.6 wt. % or sufficient to provide a substantial presence of Ni--Zr eutectic phase in the weld so as to prevent weld hot cracking. Weld filler metals formed from these so modified nickel aluminide alloys provide for crack-free welds in previously known nickel aluminide alloys.
    Type: Grant
    Filed: November 2, 1992
    Date of Patent: May 9, 1995
    Assignee: Martin Marietta Energy Systems, Inc.
    Inventors: Michael L. Santella, Gene M. Goodwin
  • Patent number: 5399313
    Abstract: There is provided by the present invention nickel-base superalloys for producing single crystal articles having improved tolerance to low angle grain boundaries and an improved balance between cyclic oxidation and hot corrosion resistance. The improved tolerance arises from the discovery that nickel-base superalloys suitable for casting as single crystal articles can be improved by the addition of small, but controlled, amounts of boron and carbon, and optionally hafnium, and is manifested principally by improved grain boundary strength. As one result of this increased grain boundary strength, grain boundary mismatches far greater than the 6.degree. limit for prior art single crystal superalloys can be tolerated in single crystal articles made from the nickel-base superalloys of this invention. This translates, for example, into lower inspection costs and higher casting yields as grain boundaries over a broader range can be accepted by visual inspection techniques without resort to expensive X-ray techniques.
    Type: Grant
    Filed: October 1, 1992
    Date of Patent: March 21, 1995
    Assignee: General Electric Company
    Inventors: Earl W. Ross, Carl S. Wukusick, Warren T. King
  • Patent number: 5393483
    Abstract: A nickel based superalloy composition is disclosed that provides increased high temperature stress-rupture strength and improved resistance to fatigue crack propagation at elevated temperatures up to about 760.degree. C. The composition is comprised of, by weight percent, about 10% to 12% chromium, about 17% to 19% cobalt, about 1.5% to 3.5% molybdenum, about 4.5% to 6.5% tungsten, about 3.25% to 4.25% aluminum, about 3.25% to 4.25% titanium, about 2.5% to 3,5% tantalum, about 0.02% to 0.08% zirconium, about 0.005% to 0.03% boron, less than 0.1% carbon, and the balance essentially nickel. Thermomechanical processing including isothermal forging at controlled strain rates and temperature ranges, supersolvus annealing, and slow cooling are disclosed for producing an enlarged grain structure that provides the improved properties in the alloy of this invention.
    Type: Grant
    Filed: April 2, 1990
    Date of Patent: February 28, 1995
    Assignee: General Electric Company
    Inventor: Keh-Minn Chang
  • Patent number: 5374319
    Abstract: A process is provided for welding a gamma-prime precipitation-strengthened nickel base superalloy by heating the weld area and adjacent region to a ductile temperature, welding while maintaining the entire weld area and adjacent region at the ductile temperature and holding the weldment, weld area and adjacent region at the ductile temperature until the entire weld has solidified. The ductile temperature is above the aging temperature but below the incipient melting temperature of the superalloy.
    Type: Grant
    Filed: November 4, 1991
    Date of Patent: December 20, 1994
    Assignee: Chromalloy Gas Turbine Corporation
    Inventors: Richard J. Stueber, Thomas Milidantri, Moshen Tadayon
  • Patent number: 5374323
    Abstract: Disclosed is a large alloy forging, the forging having an alloy composition selected from one of a nickel base alloy, a cobalt-chromium-nickel base alloy, a nickel-cobalt base alloy and an iron-nickel-chromium-molybdenum alloy, the forging having a grain size of ASTM grain size 3 or finer, as measured by ASTM method E112 and having a tensile strength in the range of 135 to 175 KSI.
    Type: Grant
    Filed: August 26, 1991
    Date of Patent: December 20, 1994
    Assignee: Aluminum Company of America
    Inventors: G. William Kuhlman, Richard A. Beaumont, Daniel F. Carbaugh, David Anderson, Al Farrell, Amiya K. Chakrabarti, Kenneth P. Kinnear
  • Patent number: 5366695
    Abstract: This invention relates to a nickel-based superalloy comprising the following elements in percent by weight: from about 5.0 to about 7.0 percent rhenium, from about 1.8 to about 4.0 percent chromium, from about 1.5 to about 9.0 percent cobalt, from about 7.0 to about 10.0 percent tantalum, from about 3.5 to about 7.5 percent tungsten, from about 5.0 to about 7.0 percent aluminum, from about 0.1 to about 1.2 percent titanium, from about 0 to about 0.5 percent columbium, from about 0.25 to about 2.0 percent molybdenum, from about 0 to about 0.15 percent hafnium, and the balance nickel+incidental impurities, the superalloy having a phasial stability number N.sub.v3B less than about 2.10.
    Type: Grant
    Filed: June 29, 1992
    Date of Patent: November 22, 1994
    Assignee: Cannon-Muskegon Corporation
    Inventor: Gary L. Erickson
  • Patent number: 5360496
    Abstract: Disclosed is a large alloy forging and method for making it. The forging having an alloy composition selected from one of a nickel base alloy, a cobalt-chromium-nickel base alloy, a nickel-cobalt base alloy and an iron-nickel-chromium-molybdenum alloy and having a grain size of ASTM grain size 4 or finer, as measured by ASTM method E112 and having a tensile strength in the range of 135 to 175 KSI. The process includes: (1) four upset forgings, (2) a rapid cooling after the final upset cooling, (3) a first and second upset forging with a reduction greater than 50%, (4) a third upset forging with a reduction greater than 25.%, and (5) a forging process with a fourth upset forging with a reduction greater than 50%.
    Type: Grant
    Filed: April 7, 1993
    Date of Patent: November 1, 1994
    Assignee: Aluminum Company of America
    Inventors: G. William Kuhlman, Richard A. Beaumont, Daniel F. Carbaugh, David Anderson, Amiya K. Chakrabarti, Kenneth P. Kinnear
  • Patent number: 5338379
    Abstract: Nickel base superalloys which contain niobium (columbium) to promote gamma double prime strengthening are improved by replacing the niobium with tantalum on an atom-for-atom basis and then heat treating the new alloy at temperatures in excess of those conventionally used for superalloys which include niobium. The resultant tantalum-bearing alloys are found to exhibit increased strength and greater phase stability than corresponding niobium-bearing alloys.
    Type: Grant
    Filed: December 17, 1992
    Date of Patent: August 16, 1994
    Assignee: General Electric Company
    Inventor: Thomas J. Kelly
  • Patent number: 5330710
    Abstract: A nickel-base alloy for a glass-contacting member used in an unenergized state and having a composition comprising by weight 25 to 40% of chromium, 10 to 45% of cobalt, optionally 0.1 to 3.0% of titanium and optionally 0.01 to 0.05% of at least one element selected from among rare earth metals with the balance consisting of nickel and unavoidable impurities.
    Type: Grant
    Filed: March 6, 1992
    Date of Patent: July 19, 1994
    Assignee: Doryokuro Kakunenryo Kaihatsu Jigyodan
    Inventors: Toshio Masaki, Noriaki Sasaki, Shin-ichiro Torata, Hiroshi Igarashi, Tetsuya Shimizu, Tomohito Iikubo
  • Patent number: 5330591
    Abstract: A nickel-based alloy useful in the manufacture of a glass fibre centrifuge of which the composition consists essentially of the following elements expressed as percentage by weight:______________________________________ Cr 27.5-29.5% W 6.5-7.8% C 0.69-0.73% Fe 7-10% ______________________________________the remainder substantially being nickel and having in its crystalline structure M.sub.23 C.sub.6 type carbides, M being chromium, at least one equivalent metal, or combination thereof, the M.sub.23 C.sub.6 carbides being substantially secondary.
    Type: Grant
    Filed: April 6, 1992
    Date of Patent: July 19, 1994
    Assignee: Isover Saint-Gobain
    Inventor: Stella Vasseur
  • Patent number: 5330711
    Abstract: A nickel-base casting alloy for use in gas turbine components consists essentially of the composition (in weight percent): carbon 0.02-0.15, chromium 14-18, cobalt 8-12, aluminum 0.5-1.5, titanium 2.0-3.5, niobium 3.5-6.0, tantalum 1.0-2.0, tungsten 1.0-3.0, molybdenum 3.0-6.0, boron 0.002-0.05, zirconium 0.01-0.1, balance nickel and incidental impurities. The alloy is characterized by a volume fraction of gamma prime of about 32%, an ultimate tensile strength in the range 990-1010 MPa over the temperature range 550.degree.-750.degree. C., and a mean coefficient of linear thermal expansion in the range 11.5-15.0 alpha(*E-06/.degree.C.).
    Type: Grant
    Filed: September 29, 1992
    Date of Patent: July 19, 1994
    Assignee: Rolls-Royce plc
    Inventor: Raymond G. Snider
  • Patent number: 5328659
    Abstract: Nickel base superalloy articles, especially gas turbine disks, are provided with substantially enhanced resistance to crack growth through a specific heat treatment. The heat treatment employs a true solution treatment step followed by a subsolvus solution treatment step, followed by at least one aging step. The effect of this series of heat treatment steps is to provide a microstructure having an optimum arrangement of gamma prime particles, with respect to both size and location. Reductions in crack growth rates of several hundred percent relative to prior art heat treatments are achieved.
    Type: Grant
    Filed: May 10, 1985
    Date of Patent: July 12, 1994
    Assignee: United Technologies Corporation
    Inventors: Thomas D. Tillman, John M. Robertson, Arthur R. Cox
  • Patent number: 5316866
    Abstract: A superalloy component includes a substrate article of a superalloy, and a strengthenable, adherent coating on the substrate. The coating is preferably a nickel-base superalloy that is strengthened by the formation of gamma and gamma-prime phases. The coating is stronger than conventional MCrAlX coatings, and, therefore, more resistant to thermal fatigue. One operable coating has a composition, in weight percent, of about 7.5 percent cobalt, about 9 percent chromium, about 6 percent aluminum, about 1 percent titanium, about 1.5 percent molybdenum, about 4 percent tantalum, about 3 percent tungsten, about 3 percent rhenium, about 0.5 percent hafnium, about 0.3 percent yttrium, about 0.5 percent columbium, about 0.05 percent carbon, about 0.015 percent boron, about 0.015 percent zirconium, and balance nickel.
    Type: Grant
    Filed: September 9, 1991
    Date of Patent: May 31, 1994
    Assignee: General Electric Company
    Inventors: Edward H. Goldman, Ramgopal Darolia
  • Patent number: 5312497
    Abstract: A method and apparatus for heat-treating nickel base superalloy articles to provide different properties in different regions of the article. An initially fine grain microstructure is heated such that a portion of the article is held above the .gamma.' solvus temperature long enough to provide a coarse grain microstructure while the remainder of the article remains below the .gamma.' solvus temperature and retains the fine grain microstructure. The coarse grain microstructure provides a reduced rate of fatigue crack growth rate while the fine grain microstructure retains good tensile properties. The invention is particularly applicable to the fabrication of turbine disks for gas turbine engines.
    Type: Grant
    Filed: December 31, 1991
    Date of Patent: May 17, 1994
    Assignee: United Technologies Corporation
    Inventor: Gerald F. Mathey
  • Patent number: 5302217
    Abstract: Superalloy castings having large variations in section thickness are heat treated using a cyclic stress relief procedure, with the temperature being cycled between about 50.degree. F. (28.degree. C.) and 150.degree. F. (83.degree. C.) below the second phase particle solvus temperature, to relieve the residual stresses incurred during cooling within the mold following casting, followed by a solution cycle at a temperature about 25.degree. F. (14.degree. C.) below the second phase particle solvus temperature to dissolve some or all of the second phase particles.
    Type: Grant
    Filed: December 23, 1992
    Date of Patent: April 12, 1994
    Assignee: United Technologies Corporation
    Inventors: William J. Gostic, Charles M. Biondo, Timothy P. Fuesting
  • Patent number: 5270123
    Abstract: A nickel base superalloy capable of being made into a single crystal article is provided with high temperature strength and improved stability by limiting the Presence of an undesirable SRZ constituent. Significant to the control of formation of such undesirable constituents is the control of the amount of Re in the alloy in combination with elements such as Al, Cr, Ta, Mo, Co and W. A solution heat treatment is provided for additional control.
    Type: Grant
    Filed: March 5, 1992
    Date of Patent: December 14, 1993
    Assignee: General Electric Company
    Inventors: William S. Walston, Earl W. Ross, Kevin S. O'Hara, Tresa M. Pollock
  • Patent number: 5269857
    Abstract: A method for preparing a heat-treated article made of a superalloy, such as a turbine disk preform, includes furnishing an article made of a superalloy that is prone to quench cracking, usually after forging the article, and thereafter covering at least a portion of the article with a quench cladding having a thickness of at least about 1/8 inch so that the quench cladding is in direct thermal contact with the article. The quench cladding may be conveniently applied to the article by thermal spraying, which produces direct thermal contact between the quench cladding and the article, or by placing the article into the envelope of the quench cladding material and hot isostatically pressing to achieve a direct thermal contact between the envelope and the article. After the quench cladding is in place, the clad article is heated to elevated temperature and quenched from the elevated temperature to a lower temperature, and the envelope is removed.
    Type: Grant
    Filed: March 31, 1992
    Date of Patent: December 14, 1993
    Assignee: General Electric Company
    Inventors: Swami Ganesh, William R. Butts, Raymond D. Rife, Thomas J. Tomlinson
  • Patent number: 5240518
    Abstract: A single crystal shroud, preferably used around the high pressure turbine section of a gas turbine engine, has a composition, in weight percent, of from about 5 to about 10 percent chromium, from about 5 to about 10 percent cobalt, from 0 to about 2 percent molybdenum, from about 3 to about 10 percent tungsten, from about 3 to about 8 percent tantalum, from 0 to about 2 percent titanium, from about 5 to about 7 percent aluminum, from 0 to about 6 percent rhenium, from 0 to about 0.50 percent hafnium, from 0 to about 0.07 percent carbon, from 0 to about 0.015 percent boron, and from 0 to about 0.075 percent yttrium, balance nickel. The environmentally- resistant shroud preferably is used in the as-cast condition without any oxidation and corrosion resistant flowpath coating.
    Type: Grant
    Filed: September 5, 1990
    Date of Patent: August 31, 1993
    Assignee: General Electric Company
    Inventors: David J. Wortman, Brian H. Pilsner, Peter J. Linko, III
  • Patent number: 5225009
    Abstract: The object of the present invention is to provide a method for the manufacturing of a cutting material possessing excellent toughness and a high strength. The composition by weight of the Nickel alloy ingot, is chromium (Cr )14-23%, molybdenum (Mo) 14-20%, tungsten (W) 0.2-5%, iron (Fe) 0.2-7%, cobalt (Co) 0.2-2.5% with the remaining portion being made up of Ni and unavoidable impurities. After undergoing a solution heat treatment process, the Ni ingot undergoes plastic working, at a product ratio above 80%, followed by heating at a temperature of 500.degree.-600.degree. C. for longer than 30 minutes. Heating the alloy of the aforementioned composition at the above mentioned temperature promotes the precipitation of an intermetallic compound possessing a hardness greater than 57 on the HRC. The resulting superior cutting material is resistant to corrosion even when exposed to sea water.
    Type: Grant
    Filed: February 13, 1992
    Date of Patent: July 6, 1993
    Assignee: Mitsubishi Materials Corporation
    Inventors: Yousuke Orikasa, Masahiro Yokomizo, Sadao Shimizu, Yukio Kawaoka, Kenji Kaneko, Hiro Ohzeki
  • Patent number: 5217684
    Abstract: A precipitation-hardening-type Ni-base alloy exhibiting improved resistance to stress corrosion cracking in a sour gas atmosphere containing elemental sulfur at high temperatures is disclosed. The alloy consists essentially of, by weight %;______________________________________ Cr: 12-25%, Mo: over 9.0 and up to 15%, Nb: 4.0-6.0%, Fe: 5.0-25%, Ni: 45-60%, C: 0.050% or less, Si: 0.50% or less, Mn: 1.0% or less, P: 0.025% or less, S: 0.0050% or less, N: 0.050% or less, Ti: 0.46-1.0%, Al: 0-2.0%.
    Type: Grant
    Filed: November 30, 1990
    Date of Patent: June 8, 1993
    Assignee: Sumitomo Metal Industries, Ltd.
    Inventors: Masaaki Igarashi, Shiro Mukai, Yasutaka Okada, Akio Ikeda
  • Patent number: 5207846
    Abstract: Nickel base superalloys which contain niobium (columbium) to promote gamma double prime strengthening are improved by replacing the niobium with tantalum on an atom-for-atom basis and then heat treating the new alloy at temperatures in excess of those conventionally used for superalloys which include niobium. The resultant tantalum-bearing alloys are found to exhibit increased strength and greater phase stability than corresponding niobium-bearing alloys.
    Type: Grant
    Filed: February 19, 1991
    Date of Patent: May 4, 1993
    Assignee: General Electric Company
    Inventor: Thomas J. Kelly
  • Patent number: 5173255
    Abstract: One form of an improved cast, hollow, columnar grain nickel base alloy article is provided with outstanding elevated temperature stability as represented by oxidation resistance, an improved combination of longitudinal and transverse stress rupture properties, and a thin wall of less than about 0.035 inch, substantially free of cracks. Described is a heat treatment in combination with an alloy for providing such an article.
    Type: Grant
    Filed: April 17, 1991
    Date of Patent: December 22, 1992
    Assignee: General Electric Company
    Inventors: Earl W. Ross, Kevin S. O'Hara
  • Patent number: 5169463
    Abstract: A work-strengthenable alloy which includes a gamma prime phase gamma prime particles comprising the following elements in percent by weight:______________________________________ molybdenum 6-16 chromium 13-25 iron 0-23 nickel 10-55 carbon 0-0.05 boron 0-0.05 cobalt balance, at least 20, ______________________________________said alloy also containing one or more elements which form gamma prime phase with nickel,the electron vacancy number, N.sub.v, of the alloy being defined byN.sub.v =0.61 Ni+1.71 Co+2.66 Fe+4.66 Cr+566 Mowherein the respective chemical symbols represent the effective atomic fractions of the respective elements present in the alloy, said value not exceeding the valueN.sub.v =2.82-0.017 W.sub.Fe,where W.sub.Fe is the percent by weight of iron in the alloy for those alloys containing no iron or less than 13 percent by weight iron and W.sub.Fe is 13 for the alloys containing from 13-23 percent by weight iron. The alloys are formed by a melt; and heating the alloy at a temperature of from 600.
    Type: Grant
    Filed: February 19, 1991
    Date of Patent: December 8, 1992
    Assignee: SPS Technologies, Inc.
    Inventors: Roger D. Doherty, Rishi P. Singh
  • Patent number: 5156808
    Abstract: The present invention provides an alloy having improved crack growth inhibition and having high strength at high temperatures. The composition of the alloy is essentially as follows:______________________________________ Ingredient Concentration in Weight % ______________________________________ Ni balance Co 15 Cr 10 Mo 3 Al 3.35 Ti 5.90 Ta 2.70 Nb 1.35 Zr 0.06 V 1 C 0.05 B 0.03.
    Type: Grant
    Filed: September 4, 1990
    Date of Patent: October 20, 1992
    Assignee: General Electric Company
    Inventor: Michael F. Henry
  • Patent number: 5154884
    Abstract: A nickel-base superalloy, particularly adapted for use in gas turbine engine single crystal blades and vanes is provided with a specific composition and heat treated in a particular manner to exhibit an improved balance of critical high temperature mechanical properties and resistance to oxidation and hot corrosion significantly superior to presently available alloys. In its broad form, the alloy composition comprises, by weight, 7-12% Cr, 1-5% Mo, 3-5% Ti, 3-5% Al, 5-15% Co, 3-12% W, up to 10% Re, 2-6% Ta, up to 2% Cb, up to 3% V, up to 2% Hf, the balance being essentially nickel and incidental impurities. Nickel-base superalloy single crystal articles formed of the alloy are described, as is the method, including heat treatment, employed to make the article.
    Type: Grant
    Filed: September 18, 1991
    Date of Patent: October 13, 1992
    Assignee: General Electric Company
    Inventors: Carl S. Wukusick, Leo Buchakjian, Jr.
  • Patent number: 5143563
    Abstract: Improved, creep-stress rupture and hold-time fatigue resistant nickel base alloys for use at elevated temperatures are disclosed. The alloys consists essentially of, in weight percent, 10.9 to 12.9% Co; 11.8 to 13.8% Cr; 4.6 to 5.6% Mo; 2.1 to 3.1% Al; 4.4 to 5.4% Ti; 1.1 to 2.1% Nb; 0.005 to 0.025% B; 0.01 to 0.06% C; 0 to 0.6% Zr; 0.1 to 0.3% Hf; balance nickel. The article is characterized by a microstructure having an average grain size of from about 20 to 40 microns, with carbides, borides, and 0.3 to 0.4 micron-sized coarse gamma prime located at the grain boundaries, and 30 nanometer-sized fine gamma prime uniformly distributed throughout the grains. The alloys are suitable for use as turbine disks in gas turbine engines of the type used in jet engines, or for use as rim sections of dual alloy turbine disks for advanced turbine engines and are capable of operation at temperatures up to about 1500.degree. F. A method for achieving the desired properties in such turbine disks is also disclosed.
    Type: Grant
    Filed: October 4, 1989
    Date of Patent: September 1, 1992
    Assignee: General Electric Company
    Inventors: Daniel D. Krueger, Jeffrey F. Wessels, Keh-Minn Chang
  • Patent number: 5131961
    Abstract: A method of forming a Ni-base superalloy suitable for use as the material for gas turbine disks or the like has a composition containing, by weight, 0.01 to 0.15% of C, 15 to 22% of Cr, 3 to 6% of Mo, 3 to 6% of W, 5 to 15% of Co, 1.0 to 1.9% of Al, 1.5 to 3.0% of Ti, 3.0 to 6.0% of Ta, 0.001 to 0.020% of B and the balance substantially Ni except inevitable impurities. This alloy is produced using the conventional ingot making and a hot working process including working at a reducing ratio greater than or equal to 10%, first above the .gamma. solvus temperature, and then during cooling to the recrystallization temperature and then subjected to direct aging without solid-solution treatment. As a result, the alloy exhibits excellent strength properties well comparable to those of expensive alloys produced by powder metallurgy process.
    Type: Grant
    Filed: September 27, 1989
    Date of Patent: July 21, 1992
    Assignee: Hitachi Metals, Ltd.
    Inventors: Koji Sato, Rikizo Watanabe
  • Patent number: 5122206
    Abstract: A precipitation strengthening type nickel base single crystal alloy, which consists essentially of, on a weight percent basis,10-30% chromium,0.1-5% niobium,0.1-8% titanium,0.1-8% aluminum,optionally one or more components selected from the group consisting of 0.1-3% tantalum, 0.05-0.5% copper, 0.05-3% hafnium, 0.05-3% rhenium, 0.05-3% molybdenum, 0.05-3% tungsten, 0.05-0.5% boron, 0.05-0.5% zirconium, andthe remainder being nickel and incidental impurities, and exhibits a narrow solidification temperature range.
    Type: Grant
    Filed: May 9, 1990
    Date of Patent: June 16, 1992
    Assignee: Mitsubishi Metal Corporation
    Inventors: Saburo Wakita, Junji Hoshi, Toshiyuki Shimamura, Akira Mitsuhashi, Toshio Yonezawa
  • Patent number: 5108700
    Abstract: The specification discloses nickel aluminide alloys which include as a component from about 0.5 to about 4 at. % of one or more of the elements selected from the group consisting of molybdenum or niobium to substantially improve the mechanical properties of the alloys in the cast condition.
    Type: Grant
    Filed: August 21, 1989
    Date of Patent: April 28, 1992
    Assignee: Martin Marietta Energy Systems, Inc.
    Inventor: Chain T. Liu
  • Patent number: 5104614
    Abstract: Superalloy with a nickel base matrix having good mechanical properties when ot in respect of tensile strength, creep resistance, low cycle fatigue and resistance to crack-propagation of which the composition in percentages by weight is as follows: Cr 11 to 13; Co 8 to 17; Mo 6 to 8; Nb less than or equal to 1.5; Ti 4 to 5; Al 4 to 5; Hf less than or equal to 1; C, B, Zr each less than or equal to 500 ppm; Ni remainder to 100. The alloy can be manufactured advantageously by powder metallurgy techniques and used in the manufacture of turbo machine disks.
    Type: Grant
    Filed: June 3, 1986
    Date of Patent: April 14, 1992
    Assignees: Societe Nationale d'Etude et de Construction de Moteurs d'Aviation "S.N.E.C.M.A.", Association pour la Recherche et le Developpement des Methodes et Processus Industriels - "A.R.M.I.N.E.S.", Tecphy, Office National d'Etudes et de Recherches Aerospatiales - "O.N.E.R.A."
    Inventors: Christian A. B. Ducrocq, Didier P. A. Lestrat, Bernard Paintendre, James H. Davidson, Michel Marty, Andre Walder
  • Patent number: 5100484
    Abstract: The present invention is directed to a heat treatment for nickel-base superalloys used to make single crystal parts and components for gas turbine engines. The heat treatment is conducted in a vacuum or inert atmosphere and includes the steps of solutionizing in a temperature range sufficient to achieve solution of at least 95% of the .gamma.' phase, preferably 2385.degree.-2395.degree. F., for 2 hours; cooling to 2000.degree. F. at 100.degree. F./min minimum, furnace cooling to 1200.degree. F. in 60 min. or less and thereafter cooling to room temperature; heating to 2050.degree..+-.25.degree. F. for 4 hours; furnace cooling to below 1200.degree. F. in 6 min. or less and thereafter to room temperature; and heating to 1650.degree..+-.25.degree. F. for 4 hours and thereafter furnace cooling to room temperature.
    Type: Grant
    Filed: January 26, 1990
    Date of Patent: March 31, 1992
    Assignee: General Electric Company
    Inventors: Carl S. Wukusick, Leo Buchakjian, Jr., Ramgopal Darolia
  • Patent number: 5100616
    Abstract: A gamma-prime precipitation hardening nickel-base yttria particle-dispersion-strengthened superalloy having a composition consisting essentially, by weight %, of 3.5 to 6.0 % of Al, 7.0 to 10.0 % of Co, 8.0 to 10.5 % of Cr, 0.5 to 1.5 % of Ti, 4.0 to 6.5 % of Ta, 7.0 to 9.0 % of W, 1.5 to 2.5 % of Mo, 0.02 to 0.2 % of Zr, 0.001 to 0.1 % of C, 0.001 to 0.02 % of B, 0.5 to 1.7 % of Y.sub.2 O.sub.3 and the balance being Ni. It has an excellent high-temperature creep rupture strength and a good corrosion resistance at high temperatures.
    Type: Grant
    Filed: July 12, 1990
    Date of Patent: March 31, 1992
    Assignee: National Research Institute for Metals
    Inventors: Yozo Kawasaki, Katsuyuki Kusunoki, Shizuo Nakazawa, Michio Yamazaki
  • Patent number: 5087305
    Abstract: An alloy is disclosed which has been found to lend itself particularly well to thermomechanical processing. The alloy is strengthened by precipitates similar to those of Inconel 718 but the alloy matrix of the composition is a nickel-chromium-cobalt matrix rather than the nickel-chromium-iron matrix of the Inconel alloy. Also the alloy has grains of average diameter of 35 .mu.m or larger. The fatigue resistance, tensile strength and the rupture strength of the alloy is improved to a remarkable degree as a result of the thermomechanical processing. The thermomechanical processing is carried out below the recrystallization temperature to prevent nucleation of fine grains. The residual strains from the thermomechanical processing or cold working provides the remarkably favorable combination of alloy properties which are found.
    Type: Grant
    Filed: July 5, 1988
    Date of Patent: February 11, 1992
    Assignee: General Electric Company
    Inventor: Keh-Minn Chang
  • Patent number: 5080726
    Abstract: A method is provided for obtaining an alloy having an ordered microstructure which comprises the steps of heating the central portion of the alloy under uniform temperature so that it enters a liquid phase while the outer portions remain solid, applying a constant electric current through the alloy during the heating step, and solidifying the liquid central portion of the alloy by subjecting it to a temperature-gradient zone so that cooling occurs in a directional manner and at a given rate of speed while maintaining the application of the constant electric current through the alloy. The method is particularly suitable for use with nickel-based superalloys. The method of the present invention produces an alloy having superior characteristics such as reduced segregation. After subsequent precipitation by heat-treatment, the alloys produced by the present invention will have excellent strength and high-temperature resistance.
    Type: Grant
    Filed: May 31, 1990
    Date of Patent: January 14, 1992
    Assignee: The United States of America as represented by the Administrator of the National Aeornautics and Space Administration
    Inventors: Eugene C. McKannan, Deborah D. Schmidt, Shaffiq Ahmed, Robert W. Bond
  • Patent number: 5080734
    Abstract: Improved, high strength, fatigue crack-resistant nickel-base alloys for use at elevated temperatures are disclosed. The alloys are suitable for use as turbine disks in gas turbine engines of the type used in jet engines, or for use as hub sections of dual alloy turbine disks for advanced turbine engines, maintaining stability at engine operating temperatures up to about 1500.degree. F. The alloy is characterized by a microstructure having an average grain size of from about 10 microns to 20 microns. Coarse and fine intragranular gamma prime particles are distributed throughout the grains, of sizes 0.15-0.2 microns and 15 nanometers, respectively. The grain boundaries are substantially free of gamma prime, but have carbides and borides. A method for achieving the desired properties in such turbine disks is also disclosed.
    Type: Grant
    Filed: October 4, 1989
    Date of Patent: January 14, 1992
    Assignee: General Electric Company
    Inventors: Daniel D. Krueger, Jeffrey F. Wessels
  • Patent number: 5078963
    Abstract: High temperature internal combustion engine assembly components, exhaust assembly components and engine compartment components comprising a high temperature material and a method of preventing engine compartment fires.
    Type: Grant
    Filed: February 14, 1990
    Date of Patent: January 7, 1992
    Inventor: Ted A. Mallen
  • Patent number: 5077141
    Abstract: Disclosed are novel nickel base single crystal alloy compositions consisting essentially of, by weight, about 4.0-10.0% chromium, 1.5-6.0% cobalt, 1.0-12.0% molybdenum, 3.0-10.0% tungsten, 2.5-7.0% titanium, 2.5-7.0% aluminum, 3.0-10.0% tantalum, about 0.02%-1.5% of hafnium and/or about 0.02%-1.0% silicon, from about 0.02%-1.0% each of yttrium and/or lanthanum, from about 0.3% to about 8.0% rhenium; from about 0.2% to about 4.0% vanadium and/or from about 0.2% to about 4.0% niobium; from about 0.02% to about 3% platinum; from about 0 to about 1.0% boron, the balance nickel, and the balance nickel.Methods of thermal treatment and coating of the novel alloys to enhance their mechanical properties are also disclosed, as are articles produced by such methods.
    Type: Grant
    Filed: November 29, 1989
    Date of Patent: December 31, 1991
    Assignee: Avco Corporation
    Inventors: Subhash K. Naik, Vinod K. Nangia
  • Patent number: 5069873
    Abstract: A nickel base superalloy for columnar grain, directional solidification which contains Re for strength and creep resistance, and substantially eliminates the use of Zr and minimizes Si to prevent DS grain boundary cracking. The creep- and stress-rupture properties, which approach nickel base superalloy single crystal performance, are achieved without the use of high temperature gamma prime solution treatment.
    Type: Grant
    Filed: August 14, 1989
    Date of Patent: December 3, 1991
    Assignee: Cannon-Muskegon Corporation
    Inventors: Kenneth Harris, Gary L. Erickson
  • Patent number: 5067986
    Abstract: A process for producing coarse, longitudinally oriented column crystals with improved temperature change resistance and ductility in the transverse direction in a workpiece of any cross-section from an oxide-dispersion-strengthened nickel-base superalloy, which exists in fine-grained form, by annealing in the temperature range between 1000.degree. and 1200.degree. C., cooling to room temperature and isothermally annealing for coarse grain in the range between 1230.degree. C. and 1280.degree. C.
    Type: Grant
    Filed: May 15, 1990
    Date of Patent: November 26, 1991
    Assignee: Asea Brown Boveri Ltd.
    Inventors: Reinhard Fried, Peter Jongenburger
  • Patent number: 5059257
    Abstract: This invention provides a process for improving, to at least a predetermined level, the stress rupture life and/or stress rupture ductility of precipitation hardenable nickel and nickel-iron base alloys containing nickel, niobium, and silicon when said alloys have less than a predetermined level of these stress rupture properties when worked and aged by a primary heat treatment. This improvement in properties is accomplished by controlled precipitation of a sufficient quantity of a (Ni, Nb, Si)-containing intermetallic phase.
    Type: Grant
    Filed: June 9, 1989
    Date of Patent: October 22, 1991
    Assignee: Carpenter Technology Corporation
    Inventors: Edward A. Wanner, Sunil Widge
  • Patent number: 5047091
    Abstract: A monocrystalline superalloy with a nickel based matrix and particularly intended for the manufacture of turbine blades, has the following composition, by weight: Al=5.4% to 6.2%; Co=4% to 7%; Cr=6% to 9%; Mo=0% to 2.5%; Ta=5.5% to 8%; Ti=O% to 1%; W=7% to 9%; and Ni=balance to 100%.The invention also provides a method of improving the alloy's resistance to creep, in which the Ni.sub.3 Al type .gamma.' phase is put completely into solution at a first temperature, and then the .gamma.' phase is precipitated into the .gamma. solid solution at a temperature greater than 1000.degree. C. This treatment considerably increases the alloy's resistance to creep over a wide range of temperatures.
    Type: Grant
    Filed: August 10, 1989
    Date of Patent: September 10, 1991
    Assignee: Office National d'Etudes et de Recherche Aerospatiales
    Inventors: Tasadduq Khan, Pierre Caron
  • Patent number: 5047093
    Abstract: A method of increasing intergranular stress corrosion cracking resistance of Alloy 718 in water reactor environments is disclosed. The Alloy is heat treated at a high annealing temperature to dissolve .delta. precipitates. The absence of .delta. particles at the grain boundaries increases the elemental homogeneity at the boundaries and increases intergranular stress corrosion cracking resistance. In addition, the absence of .delta. phase at the grain boundaries decreases the crack propagation rate.
    Type: Grant
    Filed: June 9, 1989
    Date of Patent: September 10, 1991
    Assignee: The Babcock & Wilcox Company
    Inventors: William L. Kimmerle, Marie T. Miglin