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AssigneeHitachi, Ltd.
InventorsShigeyoshi Nakamura, Tetsuo Kashimura, Nobuyuki Iizuka, Yutaka Fukui, Minoru Morikawa, Soichi Kurosawa
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A cobalt-base alloy comprises 0.2-1 wt % C 0.4-2 wt % Si, 0.2-1.5 wt % Mn, 5-15 wt % Ni, 20-35 wt % Cr, 3-15 wt % W, 0.003-0.1 wt % Ni, 20-35 wt % Cr, 3-15 wt % W, 0.003-0.1 wt % B, 0.05-1 wt % Nb, 0.01-1 wt % Ta, 2 wt % or less Fe, 30 ppm or less oxygen, 100 ppm or less nitrogen, and the balance of 45 wt % or more Co, wherein the content of Si is larger than that of Mn. The alloy is in a form of casting and has a structure containing a eutectic carbide and a secondary carbide dispersed therein. The cast alloy is produced through solution treatment at 1,100.degree.-1.200.degree. C., and aging treatment at 950.degree.-1,050.degree. C., and cooling rate after the solution treatment and after the aging treatment is 150.degree. to 300.degree. C./h. A gas turbine nozzle is made of a casting of the above-mentioned alloy.
A cobalt-base alloy having a high strength and a high toughness in the form of a casting, said alloy consisting essentially of 0.2 to 1% by weight of carboxy 0.4 to 2% by weight of silicon, 0.2 to 1.5% by weight of manganese, 5 to 15% by weight of nickel, 20 to 35% by weight of chromium, 3 to 15% by weight of tungsten, 0.003 to 0.1% by weight of boron, 0.05 to 1% by weight of niobium, 0.01 to 1% by weight of titanium, 2% by weight or lower of iron, 30 ppm or lower of oxygen and 100 ppm or lower of nitrogen with the balance being 45% by weight or higher of cobalt, wherein the content of the silicon is larger than a value of a silicon content (Si) obained from a manganese content (Mn) by the following equation:
A cobalt-base alloy having a high strength and a high toughness in the form of a casting, said alloy consisting essentially of 0.2 to 1% by weight of carbon, 0.4 to 2% weight of silicon, 0.2 to 1.5% by weight of manganese, 5 to 15% by weight of nickel, 20 to 35 % by weight of chromium, 3 to 15% by weight of tungsten, 0.003 to 0.1% by weight of boron, 0.05 to 1% by weight of niobium, 0.01 to 1% by weight of titanium, 0.02 to 0.5% by weight of zirconium, 2% by weight or lower of iron, 30 ppm or lower of oxygen and 100 ppm or lower of nitrogen with the balance being 45% by weight or higher of cobalt, wherein the content of silicon is larger than a value of a silicon content (Si) obtained from a manganese content (Mn) by the following equation:
A cobalt-base alloy having a high strength and a high toughness in the form of a casting, said alloy consisting esentially of 0.2 to 1% by weight of carbon, 0.4 to 2% by weight of silicon, 0.2 to 1.5% by weight of manganese, 5 to 15% by weight of nickel, 20 to 35 % by weight of chromium, 3 to 15% by weight of tungsten, 0.003 to 0.1% by weight of boron, 0.05 to 1% by weight of niobium, 0.01 to 1% by weight of titanium, 2% by weight or lower of iron, at least one member selected from the group consisting of 0.01 to 0.5% by weight of rare earth elements and 0.01 to 0.5% by weight of yttrium, 30 ppm or lower of oxygen and 100 ppm or lower of nitrogen with the balance being 45% by weight or higher of cobalt, wherein the content of silicon is larger than a vlaue of a silicon content (Si) obtained from a manganese content (Mn) by the following equation:
A cobalt-base alloy having a high strength and a high toughness in the form of a casting, said alloy consisting essentially of 0.2 to 1% by weight of carbon, 0.4 to 2% by weight of silicon, 0.2 to 1.5% by weight of manganese, 5 to 15% by weight of nickel, 20 to 35 % by weight of chromium, 3 to 15% by weight of tungsten, 0.003 to 0.1% by weight of boron, 0.05 to 1% by weight of niobium, 0.01 to 1% by weight of titanium, 0.02 to 0.5% by weight of zirconium, 2% by weight or lower of iron, at least one member selected from the group consisting of 0.01 to 0.5% by weight of rare earth elements and 0.01 to 0.5% by weight of yttrium, 30 ppm or lower of oxygen and 100 ppm or lower of nitrogen with the balance being 45% by weight or higher of cobalt, wherein the content of the silicon is larger than a value of a silicon content (Si) obtained from a manganese content (Mn) by the following equation:
A process for producing a cobalt-base alloy having a high strength and a high toughness in the form of a casting, said alloy consisting esentially of 0.2 to 1% by weight of carbon, 0.4 to 2% by weight of silicon, 0.2 to 1.5% by weight of manganese, 5 to 15% by weight of nickel, 20 to 35% by weight of chromium, 3 to 15% by weight of tungsten, 0.003 to 0.1% by weight of boron, 0.05 to 1% by weight of niobium, 0.01 to 1% by weight of titanium, 0.02 to 0.5% by weight of zirconium, 2% by weight or less of iron, 30 ppm or lower of oxygen and 100 ppm or less of nitrogen with the balance being 45% by weight or higher of cobalt, wherein the content of the silicon is larger than a value of a silicon content (Si) obtained from a manganese content (Mn) by the following equation:
A nozzle for a gas turbine, which nozzle comprises nozzle segments each having thin wall portions forming a hollow portion therein, and upper and lower shrouds provided at both ends of said nozzle segments so as to arrange said nozzle segments in a direction and at a distance therebetween, said nozzle segments each having cooling air holes passing through said thin wall portions from said hollow portion into the outside thereof, and which nozzle is made of a casting, said alloy consisting esentially of:
A nozzle for a gas turbine, which nozzle comprises nozzle segments each having thin wall portions forming a hollow portion therein, and upper and lower shrouds provided at both ends of said nozzle segments so as to arrange said nozzle segments in a direction and at a distance therebetween, said nozzle segments each having cooling air holes passing through said thin wall portions from said hollow portion into the outside thereof, and which nozzle is made of a casting, said alloy consisting essentially of:
Dependencies are inferred from the claim text.