Turbine blade with shroud bearing surfaces comprising a single grain structure and corresponding blade forming method

A turbine bucket (10) includes an airfoil (14) and a shroud (16). The shroud (16) includes first and second bearing surfaces (38, 40) and the first and second bearing surfaces (38, 40) each comprise a single grain structure (42). A method for forming a turbine bucket (10) includes orienting a mold (...

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Bibliographische Detailangaben
Hauptverfasser:	KING, WARREN TAN, KOTTILINGAM, SRIKANTH CHANDRUDU, PECK, ARTHUR SAMUEL
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUSPOLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE APPARATUS THEREFOR BLASTING CASTING CASTING OF METALS CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES CHEMISTRY CRYSTAL GROWTH ENGINE PLANTS IN GENERAL HEATING LIGHTING MACHINES OR ENGINES IN GENERAL MECHANICAL ENGINEERING METALLURGY NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAMTURBINES PERFORMING OPERATIONS POWDER METALLURGY PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITHDEFINED STRUCTURE REFINING BY ZONE-MELTING OF MATERIAL SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITHDEFINED STRUCTURE SINGLE-CRYSTAL-GROWTH STEAM ENGINES TRANSPORTING UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL ORUNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL WEAPONS
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Beschreibung
Zusammenfassung:	A turbine bucket (10) includes an airfoil (14) and a shroud (16). The shroud (16) includes first and second bearing surfaces (38, 40) and the first and second bearing surfaces (38, 40) each comprise a single grain structure (42). A method for forming a turbine bucket (10) includes orienting a mold (52) vertically, wherein the mold (52) includes a first portion (56) that defines a shank (12), a second portion (58) connected to the first portion (56) that defines an airfoil (14), and a third portion (60) connected to the second portion (58) that defines a shroud (16), wherein the third portion (60) includes first and second sides (66, 68) and wherein the first portion (56) is higher than the second portion (58) and the second portion (58) is higher than the third portion (60). The method further includes flowing a molten metal into the mold (52) and selectively growing large single grains in at least one of the first or second sides (66,68).