Method of making heat resistant heavy-duty components of a turbi

Details Method of making heat resistant heavy-duty components of a turbi Method of making heat resistant heavy-duty components of a turbi

1987-09-29

1989-05-02

Hall, Carl E.

Metal working

Means to assemble or disassemble

Puller or pusher means, contained force multiplying operator

29 235, 295271, B21K 300

Patent

active

048255220

ABSTRACT:
The method concerns fabricating heat-resistant heavy-duty components of a rbine, e.g. disk, wheel, etc. wherein two or more different kinds of alloys are junctioned, which comprises solidifying the one alloy powder by hot isostatic pressing or extrusion, junctioning and solidifying the solidified alloy with the other alloy powder by hot isostatic pressing or extrusion, and subjecting the alloys thus obtained to superplasticity forging thereby to secure the junction boundary. Ni-base superalloys having different complete solid solution temperatures of gamma prime phase are selected for use in the hub and rim of a turbine disk or the like, the one alloy which is higher in the temperature being disposed for the hub and the other alloy for the rim. The difference in the temperature between both alloys is at least 8.degree. C. Further solution heat treatment is performed at a temperature between the complete solid solution temperatures to adjust crystal grain size. Heat-resistant heavy-duty components of a turbine, e.g. disk, etc. are thus fabricated by superplasticity forging from Ni-base superalloys.

REFERENCES:
patent: 3519503 (1970-07-01), Moore
patent: 4081295 (1978-03-01), Vogel
patent: 4479293 (1984-10-01), Miller et al.
patent: 4479833 (1984-10-01), Gessinger et al.

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