Microstructural characterization and mechanical properties of rene 65 precipitates

C. M. Katsari, H. Che, D. Guye, A. Wessman, S. Yue

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations


Nickel based superalloys are used in the aerospace industry as turbine rotor material due to their high strength and excellent fatigue resistance at high temperature. High strength is required for the high stress and high temperature environments in which these alloys operate. This is achieved by their microstructure of gamma matrix/gamma prime precipitates. The latter can cause thermomechanical processing issues since they can make the material extremely hard. The purpose of this work is to characterize the gamma prime precipitates which are present in Rene 65, a newly developed cast and wrought nickel-based superalloy by General Electric and ATI. The main precipitate that was examined was the gamma prime phase [Ni3 (Al, Ti)], which largely determines the mechanical properties of the alloy. The gamma prime in this particular alloy was found to form in three different sizes; primary, secondary and tertiary. After various heat treatments, the differences in the volume fraction and morphology of each precipitate type is described and the effect of the precipitates on hardness is determined.

Original languageEnglish (US)
Title of host publicationProceedings of the 9th International Symposium on Superalloy 718 and Derivatives
Subtitle of host publicationEnergy, Aerospace, and Industrial Applications
EditorsEric Ott, Paul Jablonski, Zhongnan Bi, Jon Groh, Daisuke Nagahama, Karl Heck, Xingbo Liu, Kevin Bockenstedt, Joel Andersson, Chantal Sudbrack, Max Kaplan, Ian Dempster
PublisherSpringer International Publishing
Number of pages13
ISBN (Electronic)9783319894799
StatePublished - 2018
Externally publishedYes
Event9th International Symposium on Superalloy 718 and Derivatives: Energy, Aerospace, and Industrial Applications - Pittsburgh, United States
Duration: Jun 3 2018Jun 6 2018

Publication series

NameMinerals, Metals and Materials Series
ISSN (Print)2367-1181
ISSN (Electronic)2367-1696


Conference9th International Symposium on Superalloy 718 and Derivatives: Energy, Aerospace, and Industrial Applications
Country/TerritoryUnited States


  • Gamma prime
  • Hardness
  • Heat-treatment
  • Nickel-based superalloy
  • Precipitation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy Engineering and Power Technology
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry


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