摘要:
Systems and methods are provided for improved brazing. A system includes a gap filling compound (GFC) (74). The GFC (74) includes a brazing alloy (76). The system also includes a GFC retention screen (82). The GFC retention screen is (82) configured to be disposed over the GFC (74) to retain the GFC (74) within the gap (66, 68) during brazing. The GFC retention screen (82) is also configured to enable gas to escape from the GFC (74) during brazing.
摘要:
Methods of forming a compressor article such as a cast airfoil, a stator, a blade, a gas turbine, and a gas turbine shell via casting are presented. The methods include: preparing an iron-manganese-aluminum-silicon-carbon (Fe-Mn-Al-Si-C) based alloy; casting the Fe-Mn-Al-Si-C based alloy, wherein a cast has a shape of the compressor article; and performing post-casting finishing thereby forming the compressor article.
摘要:
Casting preforms (120) are provided comprising a casting preform assembly (130); and a plurality of geometrically shaped bodies (140), wherein the plurality of geometrically shaped bodies (140) are arranged or interconnected to form the casting preform assembly (130). Also provided is a method of using a casting preform (120), comprising forming a casting preform assembly (130), wherein the casting preform assembly (130) comprises a plurality of geometrically shaped bodies (140); anchoring the casting preform (120) to an outer surface (150) of a casting mold (110); introducing a fluid casting material (160) into the casting mold; applying centrifugal force to the casting mold (110); forming a molded article, wherein at least a portion of the surface of the molded article is reinforced with the plurality of geometrically shaped bodies (140).
摘要:
A method of making a ductile iron article is disclosed. The method includes providing a ductile iron article preform (112). The method also includes deforming (120) the ductile iron article preform (112) by hot-working (125) to provide a hot-worked portion (114) of the article (112). The method further includes cooling (130) the article (112) to an austempering temperature. Still further, the method includes austempering (150) the ductile iron article preform (112) for a predetermined time sufficient to provide an austempered article preform (118) comprising an austempered microstructure, wherein the austempered microstructure of the hot-worked portion (114) is different than in other portions of the article (112).
摘要:
Casting preforms (120) are provided comprising a casting preform assembly (130); and a plurality of geometrically shaped bodies (140), wherein the plurality of geometrically shaped bodies (140) are arranged or interconnected to form the casting preform assembly (130). Also provided is a method of using a casting preform (120), comprising forming a casting preform assembly (130), wherein the casting preform assembly (130) comprises a plurality of geometrically shaped bodies (140); anchoring the casting preform (120) to an outer surface (150) of a casting mold (110); introducing a fluid casting material (160) into the casting mold; applying centrifugal force to the casting mold (110); forming a molded article, wherein at least a portion of the surface of the molded article is reinforced with the plurality of geometrically shaped bodies (140).
摘要:
A method for brazing a component (70) in a power generation system (10), the brazed power generation system component (202), and braze (200) are provided to improve repairing power generation systems (10). The method includes providing the component (70) having a feature (76) in a surface (72) of the component (70) and coating (703) a particulate material (90) with a filler material (92) to obtain a coated particulate material (94). The method includes preparing the feature (76) to obtain a treatment area (80) and filling the treatment area (80) in the surface (72) of the component (70) with the coated particulate material (94). The method includes heating the treatment area (80) and surrounding component (70) to a brazing temperature and applying oxidation protection (110) to the treatment area (80). After the brazing temperature is obtained, the method includes brazing the treatment area (80) and the screen and cooling the component (70) to obtain a brazed joint (200).
摘要:
A method by which properties of a component (18) formed of a ductile iron alloy and having thick sections can be promoted with an austempering process. The method entails casting a ductile iron alloy containing iron, carbon, silicon and alloying constituents. The casting is solidified at a rate that inhibits segregation of the alloying constituents to grain boundaries of the casting, and so that the casting contains graphite nodules having a count of greater than 100 nodules per mm 2 . The casting is then austempered by heating to an austenitization temperature to yield a microstructure having a single-phase matrix of austenite that contains carbon, and then quenching the casting to an austempering temperature. The casting is held at the austempering temperature for a duration sufficient to yield a microstructure whose matrix is mostly ausferrite and essentially free of martensite and pearlite.
摘要:
A method of making an austempered ductile iron article is disclosed. The method includes providing (110) a melt of a ductile iron alloy composition. The method also includes casting (120) the melt into a mold to form a casting. The method further includes cooling the (130) casting to an austempering temperature by circulating a coolant through the mold; wherein cooling comprises solidifying the melt and forming a ductile iron article. Still further, the method includes heating (140) the casting to maintain the austempering temperature for an interval sufficient to form an austempered ductile iron article that comprises a microstructure comprising ausferrite.