Microstructure and Mechanical Properties of Additively Manufactured Rene 65

Andrew Wessman, Jonathan Cormier, Florence Hamon, Kelsey Rainey, Sammy Tin, Dhruv Tiparti, Laura Dial

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

2 Scopus citations


Additive manufacturing has enabled the production of highly complex designs that are not producible using traditional manufacturing techniques. While superalloys such as IN718 have been used in these processes for the manufacture of turbine engine structural components, applications requiring higher service temperatures necessitate the development of alloys with increased capability. Rene 65 was developed as a cast and wrought alloy with increased capability relative to wrought IN718, and characteristics of that alloy, including temperature stability and thermal crack-resistance, made Rene 65 an appealing candidate to withstand the extreme temperature gradients that are characteristic of direct metal laser melting (DMLM) additive manufacturing. The as-built DMLM microstructure is very different from as-forged microstructure, and this work will examine the effect of heat treatments both below (sub-) and above (super-) the gamma prime (γ′) solvus on the grain and precipitate structure of AM Rene 65 material. Tensile, fatigue and creep behavior of the alloy in these different heat treatment conditions is reported. Relative to AM IN718, AM Rene 65 shows the desired improvement in temperature capability analogous to that in the cast and wrought versions of the alloys. Differences in the balance of properties are noted between AM Rene 65 and cast and wrought Rene 65, which are attributable to the differences in grain size and precipitate distribution and which may provide benefits for certain applications.

Original languageEnglish (US)
Title of host publicationSuperalloys 2020 - Proceedings of the 14th International Symposium on Superalloys
EditorsSammy Tin, Mark Hardy, Justin Clews, Jonathan Cormier, Qiang Feng, John Marcin, Chris O'Brien, Akane Suzuki
PublisherSpringer Science and Business Media Deutschland GmbH
Number of pages11
ISBN (Print)9783030518332
StatePublished - 2020
Event14th International Symposium on Superalloys, Superalloys 2021 - Seven Springs, United States
Duration: Sep 12 2021Sep 16 2021

Publication series

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


Conference14th International Symposium on Superalloys, Superalloys 2021
Country/TerritoryUnited States
CitySeven Springs


  • Additive manufacturing
  • Creep
  • Fatigue
  • Rene 65
  • Superalloys

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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