Impact of the solution cooling rate and of thermal aging on the creep properties of the new cast & wrought René 65 Ni-based superalloy

Aude Laurence, Jonathan Cormier, Patrick Villechaise, Thomas Billot, Jean Michel Franchet, Florence Pettinari-Sturmel, Muriel Hantcherli, Frédéric Mompiou, Andrew Wessman

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

29 Scopus citations

Abstract

Aeroengines turbine disks can encounter temperature in excess of 700°C-750°C for hundreds to thousands of hours in the rim sections during service operations, exposures which may affect the viscoplastic properties of the alloys due to strengthening particles' growth. The present work aims at quantifying and analyzing the impact of γ′-size evolutions and of intermetallic grain-boundary precipitation during long-term thermal exposures at 700°C and 800°C on the creep properties at 700°C of the newly developed René 65 alloy. In an aim to separate both effects, various sub-solvus solution heat treatments with different cooling rates were used to achieve γ′ sizes comparable to a given thermal exposure in the 700-800°C range, without the precipitation of secondary intermetallic particles at grain boundaries. Using this methodology, it is shown unambiguously that the precipitation of TCP phases at grain boundaries is deleterious to the creep properties at 700°C/800 MPa.

Original languageEnglish (US)
Title of host publication8th International Symposium on Superalloy 718 and Derivatives 2014
EditorsEric Ott, Anthony Banik, Joel Andersson, Ian Dempster, Tim Gabb, Jon Groh, Karl Heck, Randy Helmink, Xingbo Liu, Agnieszka Wusatowska-Sarnek
PublisherJohn Wiley and Sons Inc.
Pages333-348
Number of pages16
ISBN (Electronic)9781634396424
DOIs
StatePublished - 2014
Externally publishedYes
Event8th International Symposium on Superalloy 718 and Derivatives 2014 - Pittsburgh, United States
Duration: Sep 28 2014Oct 1 2014

Publication series

Name8th International Symposium on Superalloy 718 and Derivatives 2014

Conference

Conference8th International Symposium on Superalloy 718 and Derivatives 2014
Country/TerritoryUnited States
CityPittsburgh
Period9/28/1410/1/14

Keywords

  • Creep
  • TCP precipitation
  • Thermal overaging
  • γ′ growth

ASJC Scopus subject areas

  • Metals and Alloys

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