Abstract:
A forging preform (200) for a turbine rotor (10) disk is disclosed. The preform (200) includes a body of a superalloy material (9) having a mass of about 5000 lbs or more, the superalloy material (9) having a substantially homogeneous grain morphology and an ASTM average grain size of 10 or smaller. A turbine rotor (10) disk is also disclosed. The disk includes a substantially cylindrical disk of a superalloy material having a mass of about 5000 lbs or more, the superalloy material (9) having a substantially homogeneous grain morphology and an ASTM average grain size of about 10 or smaller. A method (100) of making a turbine rotor disk is also disclosed. The method (100) includes providing a superalloy powder material (110) and pressing the superalloy powder (120) material to form a forging preform for a turbine rotor disk.
Abstract:
An article (20) is prepared by furnishing a plurality of powder particle substrates (80) made of a substrate metal, providing a nonmetallic precursor of a metallic coating material, wherein the metallic coating material comprises an alloying element that is thermophysically melt incompatible with the substrate metal, contacting the powder particle substrates (80) with the nonmetallic precursor, chemically reducing the nonmetallic precursor to form coated powder particles (102) comprising the powder particle substrates (80) having a surface-enriched layer (120) of the metallic coating material thereon without melting the powder particle substrates (80), and processing the coated powder particles (102) to form the article (20), without melting the powder particle substrates (80).
Abstract:
. An apparatus that controls the flow of a stream of metal, such as produced from the bottom of a hearth, includes a cylindrical metallic nozzle body (28) having a hollow wall which includes a slit extending substantially parallel to the axis of the cylinder so that there is no electrical continuity around the nozzle wall across the slit. The walls of the cylinder are preferably formed of hollow tubes through which cooling water is passed. A sensor senses a performance characteristic of the apparatus, such as the temperature of the nozzle body. An induction heating coil (46) surrounds the nozzle body, and a controllable induction heating power supply (48) is connected to the induction heating coil to provide power. A controller (64) controls the power provided to the induction heating coil by the induction heating power supply responsive to an output signal of the sensor (56), so that a selected performance characteristic of the apparatus may be maintained.
Abstract:
An article (20) is prepared by furnishing a plurality of powder particle substrates (80) made of a substrate metal, providing a nonmetallic precursor of a metallic coating material, wherein the metallic coating material comprises an alloying element that is thermophysically melt incompatible with the substrate metal, contacting the powder particle substrates (80) with the nonmetallic precursor, chemically reducing the nonmetallic precursor to form coated powder particles (102) comprising the powder particle substrates (80) having a surface-enriched layer (120) of the metallic coating material thereon without melting the powder particle substrates (80), and processing the coated powder particles (102) to form the article (20), without melting the powder particle substrates (80).
Abstract:
A transfer tube is produced comprised of a high density ceramic oxide tube having a low density multi-layered ceramic oxide shell directly bonded to its outer surface wall
Abstract:
Processes for fabricating components (10) to have two or more regions (12,14) with different grain structures, and components (10) produced by such processes. First and second preforms (22,24;42,44) are fabricated to comprise interface surfaces (28,48) at which the preforms (22,24;42,44) can be joined together. The first and second preforms (22,24;42,44) are formed of first and second precipitation-strengthened alloys, respectively, and the first alloy differs from the second alloy by having a higher solvus temperature or a higher grain refiner content. The preforms (22,24;42,44) are joined together to form an article (30,50) comprising first and second portions (32,34;52,54) formed by the first and second preforms (22,24;42,44), respectively, and corresponding to first and second regions (12,14) of the component (10), respectively, and the interface surfaces (28,48) of the preforms (22,24;42,44) form a joint (38,58) between the first and second portions (32,34;52,54) of the article (30,50). A supersolvus heat treatment is performed on the article (30,50) so that greater grain growth occurs in the second portion (34,54) than in the first portion (32,52).