Turbine rotor fabrication

A method for fabricating a hybrid dual property wheel assembly comprising:

• preforming a plurality of blades with a base tang thereon from a cast, corrosion resistant super alloy material, preforming a blade support ring including a plurality of circumferentially spaced blade position slots therein for receiving base tangs of each of said blades whereby adjacent blades are accurately dimensionally located one to the other, braze sealing each of said blade tangs at all exposed joint lines with each of said position slots hot isostatically pressing said braze sealed blades to said blade support ring to produce a diffusion bond therebetween, thereafter machining the inside diameter of the joined blades and ring to expose portions of said cast blade base tangs, preforming a disc of consolidated powdered metal having a controlled outside diameter, press fitting the joined ring and blades to the disc to form a butt interface therebetween, vacuum braze sealing the disc and ring blade assemblies at joint lines on either side of the butt interface, thereafter hot isostatically pressing the joined blade, ring and hub disc components to form a diffused metallurgical bond between the blade base tangs, the ring and the disc at the interface therebetween.

A method for fabricating a hybrid, dual property wheel assembly comprising:

• the steps of preforming a blade of a first predetermined high alloy material having a preformed wedge shaped base thereon, preforming a support ring for said blade element including a slot thereon including sloped walls to accept the wedge shaped base of said blade pressing each of said blade bases into one of said slots and tack welding each of the blades to the ring thereby to locate each blade on the ring, sealing each of the exposed joints between the blade base and the tapered walls of the slots on said ring, hot isostatically pressing each of said blades with respect to the support ring to diffusion bond across the interfaces of the slotted ring slot and wedge surfaces of individual blades, thereafter machining the inside diameter of the ring to a radius to expose a portion of the base of each of the blades, preforming a powdered metal disc, shrink fitting the ring and blade assembly to the outer diameter of the disc, sealing all exposed joint lines between the outer diameter of the disc and the inside diameter of the ring, and thereafter hot isostatically pressing the joined ring assembly and disc to produce a diffusion bond between the inside diameter of the ring, the exposed bottoms of the base of each of the blade elements and the disc.

A method for fabricating a hybrid, dual property wheel assembly comprising the steps of preforming a blade of a first predetermined high alloy material having a preformed wedge shaped base thereon, preforming a support ring for said blade element including a slot thereon including sloped walls to accept the wedge shaped base of said blade pressing each of said blade bases into one of said slots and tack welding each of the blades to the ring thereby to locate each blade on the ring, vacuum seal brazing each of the exposed joints between the blade base and the tapered walls of the slots on said ring, hot isostatically pressing each of said blades with respect to the support ring to diffusion bond across the interfaces of the slotted ring slot and wedge surfaces of individual blades, thereafter machining the inside diameter of the ring to a radius to expose a portion of the base of each of the blades, preforming a powdered metal disc, shrink fitting the ring and blade assembly to the outer diameter of the disc, vacuum braze sealing all exposed joint lines between the outer diameter of the disc and the inside diameter of the ring, and thereafter hot isostatically pressing the joined ring assembly and disc to produce a diffusion bond between the inside diameter of the ring, the exposed bottoms of the base of each of the blade elements and the disc.