Resistance of a directionally solidified gamma/gamma prime-delta eutectic alloy to recrystallizationA lamellar nickel-base directionally-solidified eutectic gamma/gamma prime-delta alloy has potential as an advanced gas turbine blade material. The microstructural stability of this alloy was investigated. Specimens were plastically deformed by uniform compression or Brinell indentation, then annealed between 750 and 1120 C. Microstructural changes observed after annealing included gamma prime coarsening, pinch-off and spheroidization of delta lamellae, and appearance of an unidentified blocky phase in surface layers. All but the first of these was localized in severely deformed regions, suggesting that microstructural instability may not be a serious problem in the use of this alloy.
Document ID
19760060351
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Tewari, S. N. (NASA Lewis Research Center Cleveland, OH, United States)
Scheuermann, C. M. (NASA Lewis Research Center Cleveland, OH, United States)
Andrews, C. W. (NASA Lewis Research Center Cleveland, Ohio, United States)