Method of forming a rotor

Details Method of forming a rotor Method of forming a rotor

1985-12-11

1987-07-14

Lechert, Jr., Stephen J.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Making composite or hollow article

419 8, 419 42, 419 49, 29 235, 291568R, B22F 700

Patent

active

046801600

ABSTRACT:
An improved method of forming a rotor includes the steps of hot isostatically pressing powdered metal to form disc-shaped hub sections. Each of the hub sections has a rim portion with a relatively large or coarse grain size to optimize high temperature creep properties. The central portion of each hub section has a relatively small or fine grain size to optimize tensile strength and reduce cycle fatigue at intermediate temperatures. Dispersion of any defects in the hub sections is promoted by plastically deforming the hub sections. Preformed blades are placed in an annular array between a pair of the hub sections and the hub sections are bonded together to interconnect the blades and hub sections.

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NASA Report No. CR-165224 entitled: "Development of Materials and Process Technology for Dual Alloy Disks", dated Oct. 1981, by C. S. Kortovich and J. M. Marder.

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