Development of Isothermal Forging of Titanium Centrifugal Compressor Impeller
Abstract
The technology of isothermal forging of titanium has been successfully extended to the production of impeller forgings. A four-part nickel-base superalloy die set weighing approximately 2000 lb was made and used to produce ten Ti-6Al-4V alloy forgings. The ten forgings were 13 1/2 in. OD, had a plan area of 114 sq. in., weighed between 24 and 25 1/2 lb, and had 36 blades radially emanating from the hub. The blades were 0.160 in. thick at the thinnest portion and had depths ranging from 3/4 to 1/2 in. depending upon location. The thickness of the hub portion of the forging at the 13 1/2 in. OD was typically 0.210 in. Preform temperatures were typically 1750 degree F and die temperatures 1600 degree F. Press forging loads were usually 1000 tons, equivalent to 17 kpsi forging pressure. The finish-machined impeller weighs approximately 12 lb; the isothermally produced forging typically weighs 25 lb, while the forging conventionally produced for this impeller weighs approximately 60 lb. Significant savings in raw material and machining time would therefore accrue if isothermal titanium forgings are used for this part.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1973
- Accession Number
- AD0764266
Entities
People
- T. Watmough
Organizations
- IIT Research Institute