초록 ▼

A dual alloy radial turbine rotor with high tensile strength hub material exposed in the saddle regions between the blades to prevent fatigue that causes cracks in the saddle regions is manufactured by producing the hub with additional material at the outer portions of a frustoconical rear portion o

A dual alloy radial turbine rotor with high tensile strength hub material exposed in the saddle regions between the blades to prevent fatigue that causes cracks in the saddle regions is manufactured by producing the hub with additional material at the outer portions of a frustoconical rear portion of the hub. After diffusion bonding of the outer surface of the hub to the mating inner surface of the blade rim, portions of the blade rim in the saddle regions are machined away to produce finished saddle configurations with the high tensile strength hub material exposed.

대표청구항 ▼

A radial flow turbine rotor comprising: (a) a blade ring of first superalloy material and including a rim having a hub-receiving surface that defines a generally cylindrical nose region and a generally conical rear region, said blade ring including a plurality of blades extending from said rim and d

A radial flow turbine rotor comprising: (a) a blade ring of first superalloy material and including a rim having a hub-receiving surface that defines a generally cylindrical nose region and a generally conical rear region, said blade ring including a plurality of blades extending from said rim and defining saddle regions therebetween, each of the saddle regions being disposed directly between and bounded by a pair of the thin blades; (b) a hub of second superalloy material having high tensile strength and including a generally cylindrical nose portion and a generally conical rear portion disposed in said nose region and said rear region, respectively, and diffusion bonded to said hub-receiving surface, portions of said rear portion of said hub being exposed in said saddle regions to provide high tensile strength material of said hub in said saddle regions. A method of manufacturing a radial flow turbine rotor, said method comprising the steps of: (a) providing a blade ring of first superalloy material having high creep rupture strength and including a rim having an inner surface that defines a nose region and an enlarged generally frustoconical rear region, said blade ring including a plurality of thin blades projecting outwardly from said rim and separated by saddle regions; (b) providing a hub of second superalloy material having high tensile strength and having a nose portion and an enlarged, generally frustoconical rear portion; (c) inserting said hub into said blade ring; (d) bonding said hub and said blade portion together; and, (e) machining away portions of said blade ring in said saddle regions and exposing material of said hub, in said saddle regions, whereby said radial flow turbine rotor has high tensile strength material exposed in the surface of said saddle regions to reduce effects of fatigue that lead to cracking in said saddle regions.