A Ni-based alloy having excellent hot forgeability and corrosion resistance includes, by mass %, Cr: more than 18% to less than 21%, Mo: more than 18% to less than 21%, Ta: 1.1% to 2.5%, Mg: 0.001% to 0.05%, N: 0.001% to 0.04%, Mn: 0.001% to 0.5%, Si: 0.001% to 0.05%, Fe: 0.01% to 1%, Co: 0.01% or more and less than 1%, Al: 0.01% to 0.5%, Ti: 0.01% or more and less than 0.1%, V: 0.005% or more and less than 0.1%, Nb: 0.001% or more and less than 0.1%, B: 0.0001% to 0.01%, Zr: 0.001% to 0.05%, and a balance consisting of Ni and unavoidable impurities.
Provided is an Ni-based alloy suitable as a member for a gas turbine, the alloy having a composition comprising, in mass%, Cr: 14.0-17.0% (preferably 14.0% to less than 15.0%), Fe: 5.0-9.0%, Ti: 2.2-2.8%, Al: 0.40-1.00%, total of Nb + Ta: 0.7-1.2%, B: 0.001-0.010%, Zr: 0.01-0.15%, Mg: 0.001-0.050%, Mn: 0.01-0.20%, Cu: 0.005-0.300%, Mo: 0.01-0.30%, and C: 0.01-0.05%, with the remainder being Ni and unavoidable impurities, and having excellent high-temperature creep characteristics such that, in creep tests under conditions of a test temperature of 750°C and a test load of 330 MPa, preferably, the creep fracture lifetime is 120 hours or more, and the elongation is 16% or greater.
C22C 19/05 - Alloys based on nickel or cobalt based on nickel with chromium
F01D 5/28 - Selecting particular materialsMeasures against erosion or corrosion
F01D 25/00 - Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
F02C 7/00 - Features, component parts, details or accessories, not provided for in, or of interest apart from, groups Air intakes for jet-propulsion plants
Provided is a manufacturing method for a ring formed body, the method enabling the ring formed body with a reduced dead metal region to be reliably and efficiently manufactured. In this invention, the ring formed body is manufactured in such a way that: a first forging is performed on a raw material so as to form a shape which has a disk-shaped bottom section and a circumferential wall section which is inclined in the direction from the center of the bottom section toward the outer circumference of the bottom section as going from the outer circumference of the bottom section to one side of the central axis line direction of the bottom section; the bottom section of the first forged body obtained through the first forging is then punched; the punched body is ring rolled; a ring material obtained through the ring rolling is disposed inside two dies; and then a second forging is performed on the ring material such that the ring material is pressed in the central axis line direction thereof by means of the two dies.
F02C 7/00 - Features, component parts, details or accessories, not provided for in, or of interest apart from, groups Air intakes for jet-propulsion plants
B21K 21/06 - Shaping thick-walled hollow articles, e.g. projectiles
4.
RING MATERIAL AND METHOD FOR MANUFACTURING MOLDED RING
Provided are a method for manufacturing a molded ring by which it is possible to reliably and efficiently fabricate a molded ring having a reduced dead metal region. Also provided is a ring material for use in fabricating the molded ring. The present invention pertains to a method for manufacturing a molded ring having two protruding portions that protrude to either side in the axial direction of the molded ring, and extend in the circumferential direction of the molded ring. In this manufacturing method: the ring material is arranged in two molds that form recessed parts corresponding to the protruding portions, the material being arranged so as to be supported by a region of the recessed portion of one of the two molds nearer the outer peripheral side relative to an outer-peripheral-side corner, and by a region of the recessed portion of the other of the two molds nearer the inner peripheral side relative to an inner-peripheral-side corner; the ring material is subsequently forged so as to be pressed in the axial direction thereof by the two molds; and a molded ring is fabricated. The present invention also pertains to a ring material used to fabricate the molded ring.
F02C 7/00 - Features, component parts, details or accessories, not provided for in, or of interest apart from, groups Air intakes for jet-propulsion plants
B21K 21/06 - Shaping thick-walled hollow articles, e.g. projectiles
5.
COPPER ALLOY, COLD-ROLLED METAL PLATE AND METHOD FOR MANUFACTURING SAME
Provided is a Cu-Al-Ni-based copper alloy that has an excellent workability and can be shaped into a thin plate or bar stock. The copper alloy has a composition comprising 1-7 mass% of Al, 2-4 mass% of Fe, 0.8-4 mass% of Ni, not more than 0.5% of Mn and the balance Cu with inevitable impurities.
C22C 9/06 - Alloys based on copper with nickel or cobalt as the next major constituent
C22F 1/08 - Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon
C22F 1/00 - Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
6.
NI-BASE ALLOY WITH EXCELLENT HOT FORGEABILITY AND CORROSION RESISTANCE, AND LARGE STRUCTURAL MEMBER
This alloy is configured to contain, in mass%, Cr: greater than 18% and less than 21%, Mo: greater than 18% and less than 21%, Ta: 1.1-2.5%, Mg: 0.001-0.05%, N: 0.001-0.04%, Mn: 0.001-0.5%, Si: 0.001-0.05%, Fe: 0.01-1%, Co: greater than or equal to 0.01% and less than 1%, Al: 0.01-0.5%, Ti: greater than or equal to 0.01% and less than 0.1%, V: greater than or equal to 0.005% and less than 0.1%, Nb: greater than or equal to 0.001% and less than 0.1%, B: 0.0001-0.01%, and Zr: 0.001-0.05%, the remainder being Ni and unavoidable impurities.
C22C 19/05 - Alloys based on nickel or cobalt based on nickel with chromium
7.
NI-BASED ALLOY WITH EXCELLENT HOT FORGEABILITY, RESISTANCE TO HIGH-TEMPERATURE OXIDATION, AND RESISTANCE TO HIGH-TEMPERATURE HALOGEN-GAS CORROSION, AND MEMBER COMPRISING SAID NI-BASED ALLOY
Provided is an Ni-based alloy which is excellent in terms of hot forgeability, resistance to high-temperature oxidation, and resistance to high-temperature halogen-gas corrosion and which is suitable for use as a constituent material for, for example, a baking tray for chip capacitors, a baking tray for lithium-battery positive-electrode materials, a member for CVD devices, a member for PVD devices, a member for LCD devices, and a member for semiconductor-production devices. This Ni-based alloy contains, in terms of wt%, 2.0-5.0% Al, 0.1-2.5% Si, 0.1-1.5% Mn, 0.001-0.01% B, and 0.001-0.1% Zr, with the remainder comprising Ni and unavoidable impurities, and is excellent in terms of hot forgeability, resistance to high-temperature oxidation, and resistance to high-temperature halogen-gas corrosion. This Ni-based alloy may further contain 0.8-4.0% Cr.
C22C 19/03 - Alloys based on nickel or cobalt based on nickel
C22C 19/05 - Alloys based on nickel or cobalt based on nickel with chromium
8.
NI-BASED ALLOY, NI-BASED ALLOY FOR GAS TURBINE COMBUSTOR, MEMBER FOR GAS TURBINE COMBUSTOR, MEMBER FOR LINER, MEMBER FOR TRANSMISSION PIECE, LINER, AND TRANSMISSION PIECE
This Ni-based alloy is characterized by having an estimated maximum nitride size between 12 μm and 25 μm, inclusive, in terms of area-equivalent diameter. The aforementioned estimated maximum nitride size is calculated in the following manner. A visual area (S0) to be measured is observed and the area-equivalent diameter (D), which is defined as D=A1/2 relative to the area (A) of a nitride having the biggest size within the field of view, is calculated. Said calculation is repeated for the number (n) of fields of view to be measured, and data of n number of area-equivalent diameters (D) are obtained. The data of said area-equivalent diameters (D) are arranged in order of increasing diameter from D1, D2 to Dn, and a standardized variable (yj) is obtained. The obtained values are plotted on an X-Y axis coordinate, in which the x-axis is for the area-equivalent diameters (D) and the y-axis is for the standardized variables (yj), and a regression line (yj=a×D+b (a and b being constants)) is obtained. The cross-sectional area (S) to be estimated is set as 100 mm2, and yj is obtained. The value of the obtained yj is substituted into the regression line to calculate the estimated maximum nitride size.
C22C 19/05 - Alloys based on nickel or cobalt based on nickel with chromium
C22F 1/00 - Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
C22F 1/10 - Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon
C22C 19/05 - Alloys based on nickel or cobalt based on nickel with chromium
C22F 1/10 - Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon
The present invention is a method for manufacturing an annular molded article provided with a forging step for fabricating a disk-shaped forged article by forging an alloy material, and a ring-rolling step for fabricating an annular molded article by ring-rolling an annular intermediate article obtained by forming a through-hole in the forged article, wherein said method is characterized in that hot forging is performed at least twice in the forging step. In the hot forging, the strain rate is 0.5 s‒1 or less, the absolute value εθ1 of circumferential-direction strain in the forged article is 0.3 or greater, the absolute value εh of height-direction strain of the forged article is 0.3 or greater, and the ratio between these absolute values for strain (εh/εθ1) is 0.4 to 2.5 inclusive.
This Ni-base alloy is characterized by having an estimated maximum nitride size of 25 µm or smaller in terms of area-equivalent diameter. The estimated maximum nitride size is determined in the following manner. A field of view having an area of S0 is examined, and the area-equivalent diameter D defined by D=A1/2 is calculated from the area A of the maximum-size nitride present in the field of view. This procedure is repeated in the number n of fields of view to acquire n pieces of data on the area-equivalent diameter D. These pieces of data on the area-equivalent diameter D are sequenced in order of increasing diameter into D1, D2, ···, and Dn to determine a normalized variable yj. The obtained values are plotted on X-Y axis coordinates, where the X axis is the area-equivalent diameter D and the Y axis is the normalized variable yj, to thereby determine the regression line yj=a×D+b (a and b are constants). The cross-sectional area S for the estimation is taken as 100 mm2, and the yj is determined. The obtained value of yj is substituted into the regression line to calculate the area-equivalent diameter.
C22C 19/05 - Alloys based on nickel or cobalt based on nickel with chromium
C22F 1/00 - Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
C22F 1/10 - Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon
patents
