Patents by Inventor Akira Yoshinari

Akira Yoshinari has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20210025032
    Abstract: It is an objective of the invention to provide a Ni-based superalloy cast article exhibiting the corrosion resistance compatible or superior to the conventional ordinary precision cast articles and reducing the cost than the conventional ones while maintaining the mechanical properties compatible to the conventional ones. There is provided a Ni-based superalloy cast article including: 12.1 to 16 mass % of Cr; 4 to 16 mass % of Co; 3 to 5 mass % of Al; 2.1 to 3.3 mass % of Ti; 3.5 to 9 mass % of W; 1 to 2.4 mass % of Mo; 1.2 mass % or less of Nb; 0.005 to 0.05 mass % of B; 0.03 to 0.2 mass % of C; more than 0 mass % and 0.005 mass % or less of O; and the balance being Ni and impurities.
    Type: Application
    Filed: April 2, 2018
    Publication date: January 28, 2021
    Applicant: MITSUBISHI POWER, LTD.
    Inventors: Akira YOSHINARI, Yuting WANG, Shigeru TANAKA, Takeshi IZUMI
  • Patent number: 10619233
    Abstract: There is provided a regenerated member of a nickel-based alloy member for use in a turbine. The nickel-based alloy member is in a used condition. The regenerated member is a nickel-based alloy cast article including a ? phase as a matrix and a ?? phase precipitating in the ? phase in a volume fraction of equal to or more than 30 vol % in an operational environment of the turbine. In a microstructure of the regenerated member, no recrystallized grains of the ? phase are present. And, when a GROD value of crystal grains of the ? phase of the used part undergone the solution/non-recrystallization heat treatment step is measured by electron back scattering diffraction analysis, the GROD value is equal to or more than 0.4° and equal to or less than 0.6°.
    Type: Grant
    Filed: November 28, 2017
    Date of Patent: April 14, 2020
    Assignee: MITSUBISHI HITACHI POWER SYSTEMS, LTD.
    Inventors: Shigeru Tanaka, Akira Yoshinari, Takeshi Izumi
  • Publication number: 20190194789
    Abstract: There is provided a regenerated member of a nickel-based alloy member for use in a turbine. The nickel-based alloy member is a used member having been operated for a predetermined period of time in the turbine. The regenerated member is a nickel-based alloy unidirectional solidification article or single crystalline solidification article including a ? phase as a matrix and a ?? phase precipitating in the ? phase in a volume fraction of 30 volume % or more in an operational environment of the turbine. In a microstructure of the regenerated member, no recrystallized grains of the ? phase are present. And, when a rocking curve of a predetermined crystal face of the ? phase crystal grain of the used member undergone the solution/non-recrystallization heat treatment step is measured by an XRD technique, a FWHM of the rocking curve is within a range from 0.25° to 0.30°.
    Type: Application
    Filed: December 21, 2018
    Publication date: June 27, 2019
    Inventors: Shigeru TANAKA, Takeshi IZUMI, Akira YOSHINARI
  • Patent number: 10260357
    Abstract: It is an objective of the invention to provide a steam turbine rotor of which a rotor shaft is made of a low-cost heat resistant ferritic steel and that can withstand high main steam temperatures of about 650° C. There is provided a steam turbine rotor comprising: a rotor shaft made of a heat resistant ferritic steel such as a 12-Cr steel; and a rotor blade made of a Ti—Al alloy, wherein the Ti—Al alloy includes: from 38 to 45 atomic % of Al; from 0.5 to 2 atomic % of V; from 2 to 6 atomic % of Cr and/or Mo; and the balance being Ti and incidental impurities.
    Type: Grant
    Filed: December 16, 2015
    Date of Patent: April 16, 2019
    Assignee: Mitsubishi Hitachi Power Systems, Ltd.
    Inventors: Shinji Oikawa, Shinya Imano, Hiroyuki Doi, Akira Yoshinari
  • Patent number: 10024174
    Abstract: It is an objective of the invention to provide a low cost Ni-based casting superalloy suitable for casting articles having a far better balance among a high-temperature mechanical strength, a grain boundary strength and a oxidation resistance than conventional Ni-based superalloy cast articles. There is provided an Ni-base casting super alloy including: in mass %, 0.03 to 0.15% of C; 0.005 to 0.04% of B; 0.01 to 1% of Hf; 0.05% or less of Zr; 3.5 to 4.9% of Al; 4.4 to 8% of Ta; 2.6 to 3.9% of Ti; 0.05 to 1% of Nb; 8 to 12% of Cr; 1 to 6.9% of Co; 4 to 10% of W; 0.1 to 0.95% of Mo; 0.02 to 1.1% of Si and/or 0.1 to 3% of Fe; and the balance including Ni and incidental impurities.
    Type: Grant
    Filed: November 25, 2014
    Date of Patent: July 17, 2018
    Assignee: Mitsubishi Hitachi Power Systems, Ltd.
    Inventors: Akira Yoshinari, Yuting Wang
  • Publication number: 20180148819
    Abstract: There is provided a regenerated member of a nickel-based alloy member for use in a turbine. The nickel-based alloy member is in a used condition. The regenerated member is a nickel-based alloy cast article including a ? phase as a matrix and a ?? phase precipitating in the ? phase in a volume fraction of equal to or more than 30 vol % in an operational environment of the turbine. In a microstructure of the regenerated member, no recrystallized grains of the ? phase are present. And, when a GROD value of crystal grains of the ? phase of the used part undergone the solution/non-recrystallization heat treatment step is measured by electron back scattering diffraction analysis, the GROD value is equal to or more than 0.4° and equal to or less than 0.6°.
    Type: Application
    Filed: November 28, 2017
    Publication date: May 31, 2018
    Applicant: MITSUBISHI HITACHI POWER SYSTEMS, LTD.
    Inventors: Shigeru TANAKA, Akira YOSHINARI, Takeshi IZUMI
  • Patent number: 9574451
    Abstract: An object of the present invention is to provide a Ni-based superalloy, especially for a conventional casting, having a good balance among high temperature strength, corrosion resistance and oxidation resistance, as compared to a conventional material. The Ni-based superalloy comprises Cr, Co, Al, Ti, Ta, W, Mo, Nb, C, B, and inevitable impurities, the balance being Ni, the Ni-based superalloy having a superalloy composition comprising, by mass, 13.1 to 16.0% Cr, 11.1 to 20.0% Co, 2.30 to 3.30% Al, 4.55 to 6.00% Ti, 2.50 to 3.50% Ta, 4.00 to 5.50% W, 0.10 to 1.20% Mo, 0.10 to 0.90% Nb, 0.05 to 0.20% C, and 0.005 to 0.02% B.
    Type: Grant
    Filed: April 15, 2015
    Date of Patent: February 21, 2017
    Assignee: Mitsubishi Hitachi Power Systems, Ltd.
    Inventors: Yuting Wang, Akira Yoshinari
  • Publication number: 20160177742
    Abstract: It is an objective of the invention to provide a steam turbine rotor of which a rotor shaft is made of a low-cost heat resistant ferritic steel and that can withstand high main steam temperatures of about 650° C. There is provided a steam turbine rotor comprising: a rotor shaft made of a heat resistant ferritic steel such as a 12-Cr steel; and a rotor blade made of a Ti—Al alloy, wherein the Ti—Al alloy includes: from 38 to 45 atomic % of Al; from 0.5 to 2 atomic % of V; from 2 to 6 atomic % of Cr and/or Mo; and the balance being Ti and incidental impurities.
    Type: Application
    Filed: December 16, 2015
    Publication date: June 23, 2016
    Inventors: Shinji OIKAWA, Shinya IMANO, Hiroyuki DOI, Akira YOSHINARI
  • Patent number: 9353427
    Abstract: This invention provides an Ni-based alloy, which is particularly used for standard casting and is provided with properties such as strength at high temperatures, corrosion resistivity, and oxidation resistivity in a more balanced manner, compared with existing materials. The Ni-based alloy comprises Cr, Co, Al, Ti, Ta, W, Mo, Nb, C, B, and unavoidable impurities, with the balance consisting of Ni. Composition of the alloy is represented by mass: 13.1% to 15.0% Cr, 1.0% to 15.0% Co, 2.3% to 3.3% Al, 4.55% to 6.0% Ti, 3.05% to 4.0% Ta, 4.35% to 4.9% W, 0.1% to 2.0% Mo, 0.05% to 0.5% Nb, less than 0.05% Zr, 0.05% to 0.2% C, and 0.01% to 0.03% B.
    Type: Grant
    Filed: March 16, 2011
    Date of Patent: May 31, 2016
    Assignee: MITSUBISHI HITACHI POWER SYSTEMS, LTD.
    Inventors: Yuting Wang, Akira Yoshinari
  • Patent number: 9103003
    Abstract: A Ni-based superalloy contains 13.1 to 16.0 percent by mass of Cr, 1.0 to 6.8 percent by mass of Co, 3.0 to 3.4 percent by mass of Al, 4.6 to 5.6 percent by mass of Ti, 2.0 to 4.4 percent by mass of Ta, 3.5 to 4.9 percent by mass of W, 0.1 to 0.9 percent by mass of Mo, 0.3 to 1.4 percent by mass of Nb, 0.05 to 0.20 percent by mass of C, and 0.01 to 0.03 percent by mass of B with the remainder being nickel and inevitable impurities. The superalloy excels in corrosion resistance, oxidation resistance, has high strength, and is used in parts of a gas turbine to be used at high temperature. The resulting gas turbine excels in durability.
    Type: Grant
    Filed: August 19, 2009
    Date of Patent: August 11, 2015
    Assignee: Mitsubishi Hitachi Power Systems, Ltd.
    Inventor: Akira Yoshinari
  • Publication number: 20150218952
    Abstract: An object of the present invention is to provide a Ni-based superalloy, especially for a conventional casting, having a good balance among high temperature strength, corrosion resistance and oxidation resistance, as compared to a conventional material. The Ni-based superalloy comprises Cr, Co, Al, Ti, Ta, W, Mo, Nb, C, B, and inevitable impurities, the balance being Ni, the Ni-based superalloy having a superalloy composition comprising, by mass, 13.1 to 16.0% Cr, 11.1 to 20.0% Co, 2.30 to 3.30% Al, 4.55 to 6.00% Ti, 2.50 to 3.50% Ta, 4.00 to 5.50% W, 0.10 to 1.20% Mo, 0.10 to 0.90% Nb, 0.05 to 0.20% C, and 0.005 to 0.02% B.
    Type: Application
    Filed: April 15, 2015
    Publication date: August 6, 2015
    Inventors: Yuting WANG, Akira YOSHINARI
  • Publication number: 20150147226
    Abstract: It is an objective of the invention to provide a low cost Ni-based casting superalloy suitable for casting articles having a far better balance among a high-temperature mechanical strength, a grain boundary strength and a oxidation resistance than conventional Ni-based superalloy cast articles. There is provided an Ni-base casting superalloy including: in mass %, 0.03 to 0.15% of C; 0.005 to 0.04% of B; 0.01 to 1% of Hf; 0.05% or less of Zr; 3.5 to 4.9% of Al; 4.4 to 8% of Ta; 2.6 to 3.9% of Ti; 0.05 to 1% of Nb; 8 to 12% of Cr; 1 to 6.9% of Co; 4 to 10% of W; 0.1 to 0.95% of Mo; 0.02 to 1.1% of Si and/or 0.1 to 3% of Fe; and the balance including Ni and incidental impurities.
    Type: Application
    Filed: November 25, 2014
    Publication date: May 28, 2015
    Inventors: Akira YOSHINARI, Yuting WANG
  • Patent number: 9034248
    Abstract: An object of the present invention is to provide a Ni-based superalloy, especially for a conventional casting, having a good balance among high temperature strength, corrosion resistance and oxidation resistance, as compared to a conventional material. The Ni-based superalloy comprises Cr, Co, Al, Ti, Ta, W, Mo, Nb, C, B, and inevitable impurities, the balance being Ni, the Ni-based superalloy having a superalloy composition comprising, by mass, 13.1 to 16.0% Cr, 11.1 to 20.0% Co, 2.30 to 3.30% Al, 4.55 to 6.00% Ti, 2.50 to 3.50% Ta, 4.00 to 5.50% W, 0.10 to 1.20% Mo, 0.10 to 0.90% Nb, 0.05 to 0.20% C, and 0.005 to 0.02% B.
    Type: Grant
    Filed: December 22, 2011
    Date of Patent: May 19, 2015
    Assignee: Mitsubishi Hitachi Power Systems, Ltd.
    Inventors: Yuting Wang, Akira Yoshinari
  • Patent number: 8916092
    Abstract: A Ni-based alloy including chromium, cobalt, aluminum, titanium, tantalum, tungsten, molybdenum, niobium, carbon, and boron, the balance being nickel and incidental impurities, is provided. The alloy has an alloy composition of, on the basis of mass percent, chromium: 13.10% to 16.00%, cobalt: 8.00% to 12.50%, aluminum: 2.30% to 3.50%, titanium: 4.80% to 5.50%, tantalum: 0.40% to less than 1.00%, tungsten: 4.50% to 6.00%, molybdenum: 0.10% to 1.50%, niobium: 0.60% to 1.70%, carbon: 0.01% to 0.20%, boron: 0.005% to 0.02%, and the balance: nickel and incidental impurities.
    Type: Grant
    Filed: June 6, 2012
    Date of Patent: December 23, 2014
    Assignee: Mitsubishi Hitachi Power Systems, Ltd.
    Inventors: Yuting Wang, Akira Yoshinari
  • Publication number: 20120328429
    Abstract: A Ni-based alloy including chromium, cobalt, aluminum, titanium, tantalum, tungsten, molybdenum, niobium, carbon, and boron, the balance being nickel and incidental impurities, is provided. The alloy has an alloy composition of, on the basis of mass percent, chromium: 13.10% to 16.00%, cobalt: 8.00% to 12.50%, aluminum: 2.30% to 3.50%, titanium: 4.80% to 5.50%, tantalum: 0.40% to less than 1.00%, tungsten: 4.50% to 6.00%, molybdenum: 0.10% to 1.50%, niobium: 0.60% to 1.70%, carbon: 0.01% to 0.20%, boron: 0.005% to 0.02%, and the balance: nickel and incidental impurities.
    Type: Application
    Filed: June 6, 2012
    Publication date: December 27, 2012
    Inventors: Yuting WANG, Akira YOSHINARI
  • Publication number: 20120308393
    Abstract: This invention provides an Ni-based alloy, which is particularly used for standard casting and is provided with properties such as strength at high temperatures, corrosion resistivity, and oxidation resistivity in a more balanced manner, compared with existing materials. The Ni-based alloy comprises Cr, Co, Al, Ti, Ta, W, Mo, Nb, C, B, and unavoidable impurities, with the balance consisting of Ni. Composition of the alloy is represented by mass: 13.1% to 15.0% Cr, 1.0% to 15.0% Co, 2.3% to 3.3% Al, 4.55% to 6.0% Ti, 3.05% to 4.0% Ta, 4.35% to 4.9% W, 0.1% to 2.0% Mo, 0.05% to 0.5% Nb, less than 0.05% Zr, 0.05% to 0.2% C, and 0.01% to 0.03% B.
    Type: Application
    Filed: March 16, 2011
    Publication date: December 6, 2012
    Applicant: HITACHI, LTD.
    Inventors: Yuting Wang, Akira Yoshinari
  • Publication number: 20120164020
    Abstract: An object of the present invention is to provide a Ni-based superalloy, especially for a conventional casting, having a good balance among high temperature strength, corrosion resistance and oxidation resistance, as compared to a conventional material. The Ni-based superalloy comprises Cr, Co, Al, Ti, Ta, W, Mo, Nb, C, B, and inevitable impurities, the balance being Ni, the Ni-based superalloy having a superalloy composition comprising, by mass, 13.1 to 16.0% Cr, 11.1 to 20.0% Co, 2.30 to 3.30% Al, 4.55 to 6.00% Ti, 2.50 to 3.50% Ta, 4.00 to 5.50% W, 0.10 to 1.20% Mo, 0.10 to 0.90% Nb, 0.05 to 0.20% C, and 0.005 to 0.02% B.
    Type: Application
    Filed: December 22, 2011
    Publication date: June 28, 2012
    Inventors: Yuting WANG, Akira Yoshinari
  • Publication number: 20100080730
    Abstract: A Ni-based superalloy contains 13.1 to 16.0 percent by mass of Cr, 1.0 to 6.8 percent by mass of Co, 3.0 to 3.4 percent by mass of Al, 4.6 to 5.6 percent by mass of Ti, 2.0 to 4.4 percent by mass of Ta, 3.5 to 4.9 percent by mass of W, 0.1 to 0.9 percent by mass of Mo, 0.3 to 1.4 percent by mass of Nb, 0.05 to 0.20 percent by mass of C, and 0.01 to 0.03 percent by mass of B with the remainder being nickel and inevitable impurities. The superalloy excels in corrosion resistance, oxidation resistance, has high strength, and is used in parts of a gas turbine to be used at high temperature. The resulting gas turbine excels in durability.
    Type: Application
    Filed: August 19, 2009
    Publication date: April 1, 2010
    Inventor: Akira YOSHINARI
  • Patent number: 7597843
    Abstract: Nickel based superalloys with excellent mechanical strength, corrosion resistance and oxidation resistance, which consist essentially of chromium in an amount of 3 to 7% by weight, cobalt in an amount of 3 to 15% by weight, tungsten in an amount of 4.5 to 8% by weight, rhenium in an amount of 3.3 to 6% by weight, tantalum in an amount of 4 to 8% by weight, titanium in an amount of 0.8 to 2% by weight, aluminum in an amount of 4.5 to 6.5% by weight, ruthenium in an amount of 0.1 to 6%, hafnium in an amount of 0.01 to 0.2% by weight, molybdenum in an amount of less than 0.5% by weight, carbon in an amount 0.06% by weight or less, boron in an amount of 0.01% by weight or less, zirconium in an amount of 0.01% by weight or less, oxygen in an amount of 0.005% by weight or less, nitrogen in an amount of 0.005% by weight or less and inevitable impurities and the balance being nickel.
    Type: Grant
    Filed: August 29, 2005
    Date of Patent: October 6, 2009
    Assignees: Hitachi, Ltd., The Kansai Electric Power Co., Inc.
    Inventors: Akira Yoshinari, Ryokichi Hashizume, Masahiko Morinaga, Yoshinori Murata
  • Publication number: 20090214379
    Abstract: Disclosed is a single crystal alloy consisting essentially of, by weight, 0.06-0.09% carbon, 0.016-0.035% B, 0.2-0.4% Hf, 0-0.02% Zr, 6.5-8.5% Cr, 0.4-1.0% Mo, 5.5-9.5% W, 1.2-3.1% Re, 8-10% Ta, 0.3-1.0% Nb, 0-0.4% Ti, 4.7-5.4% Al, 0.5-5.0% Co, 0.1-5% Fe, and the balance of Ni and unavoidable impurities. The alloy is free from solidification cracks during casting a large-sized blade of gas turbines, has grain boundary strength sufficient for assuring the reliability during operation, and further has excellent oxidation resistance to a high combustion gas temperature while having excellent high-temperature strength comparable to that of a conventional single crystal alloy.
    Type: Application
    Filed: February 20, 2009
    Publication date: August 27, 2009
    Inventors: Akira Yoshinari, Hideki Tamaki