Precipitation model validation in 3RD generation aeroturbine disc alloys

G. B. Olson, H. J. Jou, J. Jung, J. T. Sebastian, A. Misra, I. Locci, D. Hull

Research output: Contribution to conferencePaperpeer-review

35 Scopus citations

Abstract

In support of application of the DARPA-AIM methodology to the accelerated hybrid thermal process optimization of 3rd generation aeroturbine disc alloys with quantified uncertainty, equilibrium and diffusion couple experiments have identified available fundamental thermodynamic and mobility databases of sufficient accuracy. Using coherent interfacial energies quantified by Single-Sensor DTA nucleation undercooling measurements, PrecipiCalc™ simulations of nonisothermal precipitation in both supersolvus and subsolvus treated samples show good agreement with measured γ' particle sizes and compositions. Observed longterm isothermal coarsening behavior defines requirements for further refinement of elastic misfit energy and treatment of the parallel evolution of incoherent precipitation at grain boundaries.

Original languageEnglish (US)
Pages923-932
Number of pages10
DOIs
StatePublished - 2008
Event11th International Symposium on Superalloys, Superalloys 2008 - Champion, PA, United States
Duration: Sep 14 2008Sep 18 2008

Other

Other11th International Symposium on Superalloys, Superalloys 2008
CountryUnited States
CityChampion, PA
Period9/14/089/18/08

Keywords

  • CALPHAD
  • Diffusion
  • Modeling
  • Nickel-based superalloys
  • Precipitation
  • Thermodynamics

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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