Hitachi, Ltd.

Mitsubishi Hitachi Power Systems, Ltd.

Mitsubishi Heavy Industries Limited

Mitsubishi Power, Ltd.

Hitachi Metals, Ltd.

Tohoku University

The Japan Steel Works, Ltd.

Babcock-hitachi Kabushiki Kaisha

Daido Steel Co., Ltd.

Tokyo Institute of Technology

Shinya Imano

Jun Sato

Yutaka Sato

Hiroyuki Doi

Shigenobu Eguchi

Yuting Wang

Takashi Shibayama

Hironori Kamoshida

Yoshitaka Uemura

Norihiko Motoyama

Seunghwan Park

Kunihiro Ichikawa

Kenichi Murata

Katsumi Tanaka

Shigeyoshi Nakamura

Takeshi Onoda

Mitsuo Kuriyama

Hirotsugu Kawanaka

Haruo Akahoshi

Toshihiro Uehara

Kiyohito Ishida

Isao Takehara

Tsukasa Azuma

Jun Iwasaki

Takeshi Kudo

Satoshi Hirano

Shigeki Ueta

Akira Yoshinari

Takehiro Ohno

Takeshi Izumi

Toshihiro Omori

Kenya Ohashi

Hidetoshi Kuroki

Koji Miyamoto

Tadashi Kasuya

Hideaki Ishii

Eiji Saito

Shinji Oikawa

Tatsuya Takahashi

Hiroaki Nishida

Atsuo Ota

Takanao Komaki

Masao Takeyama

Kenji Sugiyama

Shigeo Sakurai

Mototsugu Osaki

Akihiro Toji

Ryo Ishibashi

Eiji Nishioka

Yoshitaka Kojima

Takehiko Yoshida

Koji Kajikawa

Eiji Saitou

Katsuhito Takahashi

Hiroshi Haruyama

Takashi Sato

Toshio Namatame

Tomoki Shiota

Terufumi Iwata

Hiroyuki Kokawa

Hideyuki Arikawa

Masaki Kitamura

Akira Mebata

Kazuhiko Endo

Yoshiki Kumagai

Hideki Tamaki

Gang Bao

Eguchi Shigenobu

Park Seunghwan

Masahiro Hayashi

Kazutaka Hosokawa

The present invention relates to a Co-based alloy product including a polycrystal of a Co-based alloy, the Co-based alloy including: 0.001 mass %≤C<0.100 mass %; 9.0 mass %≤Cr<20.0 mass %; 2.0 mass %≤Al<5.0 mass %; 13.0 mass %≤W<20.0 mass %; and 39.0 mass %≤Ni<55.0 mass %, with the balance being Co and unavoidable impurities, in which the Co-based alloy product comprises segregated cells formed inside a crystal grain of the polycrystal, the segregated cells have an average size of 1 μm or larger and 100 μm or smaller, and the segregated cells contain Al and Cr, and a method for producing the Co-based alloy product.

Cobalt-based alloy product and method for producing cobalt-based alloy product

A metal powder manufacturing device includes: an atomization tank; a crucible in which a molten metal is stored; a molten metal nozzle that allows the molten metal stored in the crucible to flow downward into the atomization tank; and a fluid spraying nozzle including a plurality of spraying holes that spray a fluid to an atomization tank side end part of the molten metal nozzle to pulverize a molten metal flow flowing downward from the molten metal nozzle. The molten metal nozzle includes a molten metal nozzle body and an orifice part having an inside diameter equal to or smaller than an inside diameter of the molten metal nozzle body, and a material of the orifice part is harder than a material of the molten metal nozzle body.

Metal powder manufacturing device, and crucible apparatus and molten metal nozzle for metal powder manufacturing device

There is provided a Co-based alloy material, having a chemical composition including: Al of 0.1 to 10 mass %; W of 3 to 45 mass %, the total content of Al and W being 50 mass % or less; O of 0.007 to 0.05 mass %; and the balance being Co and impurities, wherein in γ phase crystal grains as a matrix phase of the Co-based alloy material, segregation cells within an average size of 0.15 to 1.5 μm are formed, wherein in the segregation cells, γ′ phase grains within a size of 0.01 to 0.5 μm including Co, Al and W are dispersively precipitated, and wherein on boundary regions of the segregation cells and grain boundaries of the γ phase crystal grains, μ phase grains within a size of 0.005 to 2 μm including Co and W are dispersively precipitated.

Co-based alloy material, co-based alloy product, and method for manufacturing said product

A metal powder production apparatus capable of easily preventing an oxide in a molten metal from entering a liquid nozzle is provided. The metal powder apparatus includes a first crucible heating and melting a melting material to generate molten metal, a first heating device heating and melting the metal in the first crucible, a stopper opening and closing a first opening provided on the bottom surface of the first crucible, an introduction pipe having one end connected to the first opening of the first crucible and leading a molten metal in the first crucible to the outside of the first crucible, a second crucible receiving the molten metal flowing out of the introduction pipe, a second heating device heating the second crucible, and a liquid nozzle provided on the bottom surface of the second crucible.

Metal powder production apparatus

Gas injector for metal powder manufacturing equipment

There is provided a cobalt-based alloy product comprising: in mass %, 0.08-0.25% C; 0.1% or less B; 10-30% Cr; 5% or less Fe and 30% or less Ni, the total amount of Fe and Ni being 30% or less; W and/or Mo, the total amount of W and Mo being 5-12%; at least one of Ti, Zr, Hf, V, Nb and Ta, the total amount of Ti, Zr, Hf, V, Nb and Ta being 0.5-2%; 0.5% or less Si; 0.5% or less Mn; 0.003-0.04% N; and the balance being Co and impurities. The product is a polycrystalline body of matrix phase crystal grains. In the matrix phase crystal grains, post-segregation cells with an average size of 0.13-2 &#x3bc;m are formed, wherein components constituting an MC type carbide phase comprising Ti, Zr, Hf, V, Nb and/or Ta are segregated along boundary regions of the post-segregation cells.

Cobalt based alloy product and method for manufacturing same

A metal-powder producing apparatus includes a spray chamber, and a plurality of spray nozzles that liquid-spray a melted metal into the spray chamber. Each of the plurality of spray nozzles includes: a liquid nozzle that allows the melted metal to flow down into the spray chamber; and a gas-jet nozzle that has a plurality of gas-jet holes arranged around the liquid nozzle and causing a gas fluid to collide with the melted metal having flowed down from the liquid nozzle.

Metal-powder producing apparatus, and gas jet device and crucible container thereof

Provided is a method for manufacturing an Ni-based alloy member in which the equilibrium amount of &#x3b3;' phase precipitation at 700&#xb0; C. is from 30 to 70 volume %. The method includes the steps of preparing an Ni-based alloy powder having a predetermined chemical composition; forming a precursor body wherein an average grain diameter of the &#x3b3; phase grains is 50 &#x3bc;m or less, by using the Ni-based alloy powder; and heating the precursor body to a temperature at least the &#x3b3;&#x2032; phase solvus temperature and subsequently slow-cooling the heated precursor body from the temperature to a temperature at least 100&#xb0; C. lower than the &#x3b3;&#x2032; phase solvus temperature at a cooling rate of 100&#xb0; C./h or lower. There is obtained a softened body in that the &#x3b3;&#x2032; phase particles of at least 20 volume % precipitate between/among the &#x3b3; phase grains having an average grain diameter of 50 &#x3bc;m or less.

Method for manufacturing Ni-based alloy member

There is provided a cobalt-based alloy product comprising: in mass %, 0.08-0.25% C; 0.1% or less B; 10-30% Cr; 5% or less Fe and 30% or less Ni, the total amount of Fe and Ni being 30% or less; W and/or Mo, the total amount of W and Mo being 5-12%; 0.5% or less Si; 0.5% or less Mn; 0.003-0.04% N; 0.5 to 2 mass % of an M component being a transition metal other than W and Mo and having an atomic radius of more than 130 pm; and the balance being Co and impurities. The impurities include 0.5% or less Al and 0.04% or less O. The product is a polycrystalline body of matrix phase crystal grains. In the matrix phase crystal grains, segregation cells with an average size of 0.13-2 &#x3bc;m are formed, in which the M component is segregated in boundary regions of the segregation cells.

Cobalt based alloy product

A Co-based alloy heat exchanger comprises: in mass %, 0.08-0.25% C; 0.1% or less B; 10-30% Cr; 5% or less Fe and 30% or less Ni, the total amount of Fe and Ni being 30% or less; W and/or Mo, the total amount of W and Mo being 5-12%; Ti, Zr, Nb and Ta, the total amount of Ti, Zr, Nb and Ta being 0.5-2%; 0.5% or less Si; 0.5% or less Mn; 0.003-0.04% N; and the balance being Co and impurities. The impurities include 0.5% or less Al, and 0.04% or less O. The heat exchanger is a polycrystalline body of matrix crystal grains with an average size of 5-100 &#x3bc;m. In the matrix crystal grains, segregation cells with an average size of 0.13-2 &#x3bc;m are formed, wherein components constituting an MC type carbide comprising Ti, Zr, Nb and/or Ta are segregated in boundary regions of the segregation cells.

Heat exchanger

There is provided a cobalt-based alloy product comprising: in mass %, 0.08-0.25% C; 0.1% or less B; 10-30% Cr; 5% or less Fe and 30% or less Ni, the total amount of Fe and Ni being 30% or less; W and/or Mo, the total amount of W and Mo being 5-12%; at least one of Ti, Zr, Hf, V, Nb and Ta, the total amount of Ti, Zr, Hf, V, Nb and Ta being 0.5-2%; 0.5% or less Si; 0.5% or less Mn; 0.003-0.04% N; and the balance being Co and impurities. The cobalt-based alloy product is a polycrystalline body of matrix phase crystal grains, wherein MC type carbide phase grains are dispersively precipitated in the matrix phase crystal grains at an average intergrain distance of 0.13 to 2 &#x3bc;m and MCtype carbide phase grains are precipitated on grain boundaries of the matrix phase crystal grains.

Cobalt based alloy product, method for manufacturing same, and cobalt based alloy article

This method for manufacturing a high-temperature component formed of a Ni-based alloy includes a step of subjecting a workpiece of the Ni-based alloy to hot die forging using predetermined dies to form a forge-molded article, the step including: a die/workpiece co-heating substep of heating the workpiece interposed between the dies to a forging temperature; and a hot forging substep of taking out the workpiece and the dies into a room temperature environment and immediately performing hot forging on the workpiece using a press machine. The predetermined dies are formed of another Ni-based superalloy comprising &#x3b3; and &#x3b3;' phases, and have features in that: a solvus temperature of the &#x3b3;&#x2032; phase is 1050-1250&#xb0; C.; and the &#x3b3;&#x2032; phase precipitates at least 10 vol. % at 1050&#xb0; C. and has two kinds of forms of intra-grain &#x3b3;&#x2032; phase precipitations within the &#x3b3; phase grains and inter-grain &#x3b3;&#x2032; phase precipitations between/among the &#x3b3; phase grains.

Method for manufacturing nickel-based alloy high-temperature component

An objective of the invention is to provide a Ni-based forged alloy article based on a superhigh precipitation-strengthening Ni-based alloy material that has mechanical properties balanced at higher level than before, and a turbine high-temperature member formed of the forged alloy article. There is provided a Ni-based forged alloy article comprising crystal grains of the &#x3b3; phase and precipitation particles of the &#x3b3;' phase, and having a chemical composition enabling to precipitate a &#x3b3;&#x2032; phase in an amount of 50-70 volume % at 700&#xb0; C. within a matrix of a &#x3b3; phase. The &#x3b3;&#x2032; phase comprises: aging precipitation &#x3b3;&#x2032; phase particles precipitating within the &#x3b3; phase grains; and eutectic reaction &#x3b3;&#x2032; phase particles precipitating between/among the &#x3b3; phase grains. The eutectic reaction &#x3b3;&#x2032; phase particles comprise a higher content of Ni and Al than the aging precipitation &#x3b3;&#x2032; phase particles and have an average particle size of 2 to 40 &#x3bc;m.

Ni-based forged alloy article and turbine high-temperature member using same

There is provided an additive manufactured (AM) article formed of a Co based alloy having a composition comprising: in mass %, 0.08-0.25% C; 0.1% or less B; 10-30% Cr; 30% or less in total of Fe and Ni, the Fe being 5% or less; 5-12% in total of W and/or Mo; 0.5-2% in total of Ti, Zr, Nb and Ta; 0.5% or less Si; 0.5% or less Mn; 0.003-0.04% N; and the balance being Co and impurities. The AM article comprises crystal grains with an average size of 10-100 &#x3bc;m. In the crystal grains, segregation cells with an average size of 0.15-1.5 &#x3bc;m are formed, in which components constituting an MC type carbide phase comprising the Ti, Zr, Nb and/or Ta are segregated in boundary regions of the cells, and/or grains of the MC type carbide phase are precipitated at an average intergrain distance of 0.15-1.5 &#x3bc;m.

Cobalt based alloy additive manufactured article, cobalt based alloy product, and method for manufacturing same

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Hitachi, Japan

Shinya Imano