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Heat Treatment Devices and Method of Operation Thereof to Produce Dual Microstructure Superalloys DisksA heat treatment assembly and heat treatment methods are disclosed for producing different microstructures in the bore and rim portions of nickel-based superalloy disks, particu- larly suited for gas turbine applications. The heat treatment assembly is capable of being removed from the furnace and disassembled to allow rapid fan or oil quenching of the disk. For solutioning heat treatments of the disk, temperatures higher than that of this solvus temperature of the disk are used to produce coarse grains in the rim of each disk so as to give maximum creep and dwell crack resistance at the rim service temperature. At the same time, solution temperature lower than the solvus temperature of the disk are provided to produce fine grain in the bore of the disk so as to give maximum strength and low cycle fatigue resistance.
Document ID
20040015213
Acquisition Source
Glenn Research Center
Document Type
Other - Patent
Authors
John Gayda
Timothy P Gabb
Peter T Kantzos
Date Acquired
August 21, 2013
Publication Date
December 9, 2003
Subject Category
Mechanical Engineering
Report/Patent Number
NASA-Case-LEW-17206-1
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
US-Patent-6,660,110
Patent Application
US-Patent-Appl-SN-118625
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