Patents by Inventor Munetsugu Matsuo
Munetsugu Matsuo 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).
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Patent number: 5846351Abstract: TiAl-besed intermetallic compound alloys contain chromium and consist essentially of a dual-phase microstructure of .gamma. and .beta. phases, with the .beta. phase precipitating at .gamma. grain boundaries. The .beta. phase precipitating at .gamma. grain boundaries is 2% to 25% by volume fraction. A process for preparing TiAl-based intermetallic compound alloys comprises the steps of preparing a molten TiAl-based intermetallic compound alloy of a desired composition, solidifying the molten alloy, homogenizing the solidified alloy by heat treatment, and thermomechanically working the homogenized alloy.Type: GrantFiled: February 11, 1997Date of Patent: December 8, 1998Assignee: Nippon Steel CorporationInventors: Naoya Masahashi, Youji Mizuhara, Munetsugu Matsuo
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Patent number: 5648045Abstract: TiAl-based intermetallic compound alloys contain chromium and consist essentially of a dual-phase microstructure of .gamma. and .beta. phases, with the .beta. phase precipitating at .gamma. grain boundaries. The .beta. phase precipitating at .gamma. grain boundaries is 2% to 25% by volume fraction. A process for preparing TiAl-based intermetallic compound alloys comprises the steps of preparing a molten TiAl-based intermetallic compound alloy of a desired composition, solidifying the molten alloy, homogenizing the solidified alloy by heat treatment, and thermomechanically working the homogenized alloy.Type: GrantFiled: May 3, 1996Date of Patent: July 15, 1997Assignee: Nippon Steel CorporationInventors: Naoya Masahashi, Youji Mizuhara, Munetsugu Matsuo
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Patent number: 5518690Abstract: TiAl-besed intermetallic compound alloys contain chromium and consist essentially of a dual-phase microstructure of .gamma. and .beta. phases, with the .beta. phase precipitating at .gamma. grain boundaries. The .beta. phase precipitating at .gamma. grain boundaries is 2% to 25% by volume fraction. A process for preparing TiAl-based intermetallic compound alloys comprises the steps of preparing a molten TiAl-based intermetallic compound alloy of a desired composition, solidifying the molten alloy, homogenizing the solidified alloy by heat treatment, and thermomechanically working the homogenized alloy.Type: GrantFiled: August 12, 1994Date of Patent: May 21, 1996Assignee: Nippon Steel CorporationInventors: Naoya Masahashi, Youji Mizuhara, Munetsugu Matsuo
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Patent number: 5370839Abstract: TiAl-besed intermetallic compound alloys contain chromium and consist essentially of a dual-phase microstructure of .gamma. and .beta. phases, with the .beta. phase precipitating at .gamma. grain boundaries. The .beta. phase precipitating at .gamma. grain boundaries is 2% to 25% by volume fraction. A process for preparing TiAl-based intermetallic compound alloys comprises the steps of preparing a molten TiAl-based intermetallic compound alloy of a desired composition, solidifying the molten alloy, homogenizing the solidified alloy by heat treatment, and thermomechanically working the homogenized alloy.Type: GrantFiled: July 1, 1992Date of Patent: December 6, 1994Assignee: Nippon Steel CorporationInventors: Naoya Masahashi, Youji Mizuhara, Munetsugu Matsuo
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Patent number: 5348702Abstract: This invention relates to TiAl based intermetallic compound alloy and process for producing; the object of this invention is to improve high temperature deformability. The alloy comprises basic components: Ti.sub.y AlCr.sub.x, wherein 1%.ltoreq.X.ltoreq.5%, 47.5%.ltoreq.Y.ltoreq.52%, and X+2Y.gtoreq.100%, and comprises a fine-grain structure with a .beta. phase precipitated on a grain boundary of equiaxed .gamma. grain having grain size of less than 30 .mu.m, and possessing a superplasticity such that the strain rate sensitivity factors (m value) is 0.40 or more and tensile elongation is 400% or more tested at 1200.degree. C. and a strain rate of 5.times.10.sup.-4 S.sup.-1.Type: GrantFiled: March 5, 1993Date of Patent: September 20, 1994Assignee: Nippon Steel CorporationInventors: Munetsugu Matsuo, Naoya Masahashi, Keizo Hashimoto, Toshihiro Hanamura, Hideki Fujii, Masao Kimura, Youji Mizuhara, Hiroo Suzuki
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Patent number: 5256202Abstract: The present invention provides a Ti--Al intermetallic compound sheet of a thickness in the range of 0.25 to 2.5 mm formed of a Ti--Al intermetallic compound of 40 to 53 atomic percent of Ti, 0.1 to 3 atomic percent of at least one of material selected from the group consisting of Cr, Mn, V and Fe, and the balance of Al, and a Ti--Al intermetallic compound sheet producing method comprising the steps of pouring a molten Ti--Al intermetallic compound of the foregoing composition into the mold of a twin drum continuous casting machine, casting and rapidly solidifying the molten Ti--Al intermetallic compound to produce a thin cast plate of a thickness in the range of 0.25 to 2.5 mm and, when necessary, subjecting the thin cast plate to annealing and HIP treating. The Ti--Al intermetallic compound sheet has excellent mechanical and surface properties.Type: GrantFiled: August 23, 1991Date of Patent: October 26, 1993Assignee: Nippon Steel CorporationInventors: Toshihiro Hanamura, Munetsugu Matsuo, Toshiaki Mizoguchi, Kenichi Miyazawa, Masao Kimura, Naoya Masahashi
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Patent number: 5232661Abstract: This invention relates to TiAl based intermetallic compound alloy and process for producing; the object of this invention is to improve high temperature deformability. The alloy comprises basic components: Ti.sub.y AlCr.sub.x, wherein 1%.ltoreq.X.ltoreq.5%, 47.5%.ltoreq.Y.ltoreq.52%, and X+ 2Y.gtoreq.100%, and comprises a fine-grain structure with a .beta. phase precipitated on a grain boundary of equiaxed .gamma. grain having grain size of less than 30 .mu.m, and possessing a superplasticity such that the strain rate sensitivity factors (m value) is 0.40 or more and tensile elongation is 400% or more tested at 1200.degree. C. and a strain rate of 5.times.10.sup.-4 S.sup.-1.Type: GrantFiled: August 8, 1991Date of Patent: August 3, 1993Assignee: Nippon Steel CorporationInventors: Munetsugu Matsuo, Naoya Masahashi, Keizo Hashimoto, Toshihiro Hanamura, Hideki Fujii, Masao Kimura, Youji Mizuhara, Hiroo Suzuki
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Patent number: 4563226Abstract: Conventionally, the silicon content of a grain-oriented electrical steel is approximately 3% at the maximum, since cold-rolling is difficult if the silicon content is high. Although conventional warm-rolling can occasionally mitigate the poor workability of a silicon steel having a high silicon content, it is impossible to control the texture of a cold-rolled strip and to completely prevent brittleness.The present invention provides a novel rolling method in which, due to the heating of a steel strip prior to the carrying out of cold-rolling, a desirable texture can be formed and rupture of the cold-rolled strip can be prevented. The strip is heated to within a temperature range, in which both the minimum temperature which is at least 200.degree. C. and at least equal to T.sub.L (.degree.C.)=(x-3.0).sup.2 .times.100, x being the silicon content in weight percent, and the maximum temperature which temperature range being is not more than 400.degree. C. and not more than T.sub.H (.degree.C.)=-200.times.Type: GrantFiled: November 16, 1982Date of Patent: January 7, 1986Assignee: Nippon Steel CorporationInventors: Munetsugu Matsuo, Fumio Matsumoto, Tadashi Nakayama
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Patent number: 4408561Abstract: A dual-purpose production plant for cold rolled steel sheets and hot-dip galvanized steel sheets having, successively disposed in series, a heating zone, a soaking zone, a primary cooling zone, an overaging zone equipped with a controlled cooling facility, a molten galvanizing zone, an intermediate cooling means, a secondary cooling zone, a temper rolling means, and a chemical treatment means, and a bypass for directly connecting the overaging zone and the secondary cooling zone with each other.Type: GrantFiled: August 24, 1981Date of Patent: October 11, 1983Assignee: Nippon Steel CorporationInventors: Hideo Yokoyama, Ichiro Shimbashi, Koichi Sakurai, Munetsugu Matsuo
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Patent number: 4376661Abstract: A method of producing a dual phase structure cold rolled steel sheet having tensile strength 35 to 50 kg/mm.sup.2, yield ratio less than 60% and high elongation which comprises hot rolling and cold rolling by conventional process a steel containing 0.01 to 0.05% C, less than 0.2% Si, 1.7 to 2.5% Mn, 0.01 to 0.10 Al with the balance being Fe and unavoidable impurities, holding the produced steel sheet for 20 seconds to 20 minutes at a temperature 720.degree. to 850.degree. C., and cooling the steel sheet at a cooling speed between 3.degree. and 50.degree. C. per second and also above a value (.degree.C. per second) shown by following formulae:12.times.[Mn(%)].sup.2 -62.times.[Mn(%)]+81.Type: GrantFiled: June 13, 1979Date of Patent: March 15, 1983Assignee: Nippon Steel CorporationInventors: Hiroshi Takechi, Munetsugu Matsuo, Kazuo Koyama
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Patent number: 4374682Abstract: A process for producing a cold rolled steel strip having excellent workability by a short-time continuous annealing, which process is constituted by hot rolling a low carbon steel slab of steel having a carbon content of from about 0.003 to 0.08% into a steel strip; cold rolling the hot rolled steel strip; rapidly heating the cold rolled steel strip to a recrystallization temperature range at a heating rate not less than 40.degree. C./second; slowly heating the thus rapidly heated steel strip to an annealing temperature at a heating rate ranging from 5.degree. to 30.degree. C./second; annealing the thus slowly heated steel strip at an annealing temperature T which is no lower than 700.degree. C. and no higher than the A.sub.3 transformation temperature and for an annealing time t no shorter than [8-0.03 (T-680)] seconds and no longer than [80-0.15 (T-680)] seconds, initially slowly cooling the thus annealed steel strip at a cooling rate less than 50.degree. C.Type: GrantFiled: October 9, 1980Date of Patent: February 22, 1983Assignee: Nippon Steel CorporationInventors: Mitsunobu Abe, Ikushi Yoshida, Munetsugu Matsuo, Hiroshi Hayakawa
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Patent number: 4315783Abstract: A method of producing a non-ageing cold rolled steel strip having excellent deep-drawability, with a r value of 1.5 or higher and ageing index of not higher than 3 kg/mm.sup.2 from an Al-killed steel with a lowered carbon content between 0.001 and 0.0035% and with no special additives such as titanium by a relatively low temperature coiling in the hot rolling, and a short-time continuous annealing without over-ageing, thus over-coming the disadvantages caused by a high temperature coiling and by additional over-ageing.Type: GrantFiled: October 17, 1979Date of Patent: February 16, 1982Assignee: Nippon Steel CorporationInventors: Osamu Akisue, Teruaki Yamada, Munetsugu Matsuo, Norimasa Uehara
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Patent number: 4296919Abstract: An apparatus for continuously producing a high strength dual-phase steel strip or sheet having a chemical composition which produces a dual-phase structure composed of ferrite grains and a low temperature transformed phase when rapidly cooled from the (.alpha.+.gamma.) temperature range or from the .gamma. temperature range. The apparatus has a continuous heat treatment furnace in which the strip moves vertically and which is composed of a heating zone, a soaking zone and a cooling zone, and conventional equipment associated therewith. The cooling zone has an upper hearth roll group, a lower hearth roll group and cooling equipment for cooling the strip at a rate in the range between 1.degree. and 300.degree. C./sec. for retaining the austenite in the steel of the strip.Type: GrantFiled: August 13, 1980Date of Patent: October 27, 1981Assignee: Nippon Steel CorporationInventors: Koichi Sakurai, Takashi Furukawa, Hiroshi Takechi, Munetsugu Matsuo
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Patent number: 4070208Abstract: A slab or ingot of ferritic stainless steel for deep drawing applications is subjected to hot rolling, coiled at 450.degree. to 750.degree. C, subjected to warm rolling without cooling the coil by a rolling mill installed separately from the hot strip rolling mill, subjected to continuous annealing, and subjected to cold rolling and final annealing.Type: GrantFiled: January 3, 1977Date of Patent: January 24, 1978Assignee: Nippon Steel CorporationInventors: Satohiro Hayami, Munetsugu Matsuo, Soichi Izumi, Ryoji Terakado