The following introductory overviews will be presented at the 4th International Symposium on Superalloys 718, 625, 706 and Derivatives, following a complimentary reception (6:45-7:45 PM) on Sunday evening, June 15th, 1997. Introductions will be made by E.A. Loria, symposia chair.
Spraycast-X® IN718 Processing Benefits
N.E. Paton, and K. Bowen, Howmet Technical Center, Whitehall, MI; and A. Cabral, Pratt & Whitney Aircraft, E. Hartford, CT
The Spraycast-X process has been developed by Howmet and verified in a wide range of Ni-based superalloys, including IN718, for manufacturing thick-wall structures for jet engines rings and cases. The process will be described along with features of the end-product such as fine, homogenous microstructure, improved machinability and the ability to process non-forgeable alloys.
Electron Metallography of Alloy 718
John F. Radavich, Professor Emeritus, Purdue University, W. Lafayette, IN
Optimum electron metallographic evaluation of phases in Alloy 718 depend primarily on proper sample preparation. Electrolytic procedures have been used successfully to show or identify the presence of various phases based on their selective behavior to the electrolytic attack. Various electrolytic preparations will be described and their effects on the microstructure will be discussed.
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