Dual alloy turbine wheels
AssigneeThe Garrett Corporation
InventorsGeorge S. Hoppin, III, George Curbishley
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Abstract
A dual alloy turbine wheel manufacture of a cast integral blade ring pressure-sealed to a wrought alloy hub and thereafter bonded thereto by hot isostatic pressing.
Claims15
A method for manufacturing a dual alloy turbine wheel having a superalloy blade ring of high creep rupture strength at temperatures up to about 1800 degrees F., and a superalloy hub of high tensile strength and highly resistant to low cycle fatique at tensile stress of at least 150,000 psi, to form a direct metallurgical bond between said hub and said ring, comprising the steps of:
- (a) preforming said blade ring and said hub with said ring ID shaped to receive the outer circumferential surface of said hub in near full surface area contact at the ring-hub surface interface;
- (b) assembling said hub in said ring with a deformable plate member of relatively thin-section temperature resistant material enclosing the ring-hub interface area;
- (c) bonding said plate member to said ring-hub assemblage to effect a vacuum seal between said ring, said hub and said plate member and
- (d) subjecting said sealing plate member and ring-hub assemblage to hot isostatic pressing at a hot isostatic pressing temperature and pressure to effect direct metallurgical bonding of said ring to said hub.
A vacuum sealed dual alloy turbine wheel assemblage having an integral blade ring of an alloy of high creep rupture strength at temperatures up to about 1800 degrees F. and a hub of an alloy of high tensile strength and which is highly resistant to low cycle fatigue at tensile stress of at least 150,000 psi, joined with an expendable temperature resistant membrane by bonding said membrane to said ring to vacuum seal said hub-ring interface, said membrane being functional to transmit pressure encountered during hot isostatic pressing to said sealed hub and ring to effect a direct metallurgical bond at said interface between said hub and said ring.
Dependencies are inferred from the claim text.