Interaction of the precipitation kinetics of δ and γ' phases in nickel-base superalloy ATI Allvac® 718Plus™

Rene Radis, Gerald A. Zickler, Martin Stockinger, Christof Sommitsch, Ernst Kozeschnik

Research output: Chapter in Book/Report/Conference proceedingConference contributionResearchpeer-review

Abstract

In this paper, the precipitation behaviour of δ (Ni 3(Nb,Al)) and γ' (Ni3(Al,Ti,Nb)) phases in the nickel-base superalloy ATI Allvac® 718Plus™, as well as their kinetic interactions are discussed. Important parameters such as volume fraction, mean radius and number density of precipitates are experimentally determined and numerically simulated as a function of the heat treatment parameters time and temperature. To match the experimentally observed kinetics, the predicted interfacial energy of the precipitates, as calculated for a sharp, planar phase boundary, is adjusted to take into account the interfacial curvature and entropic effects of a diffuse interface. Correction functions for the interfacial energies of δ as well as γ' precipitates are presented. Using these modified interfacial energies, the calculated results show excellent agreement with the experimental measurements.

Original languageEnglish
Title of host publicationTHERMEC 2009
Pages2712-2717
Number of pages6
DOIs
Publication statusPublished - 9 Feb 2010
Event6th International Conference on Processing and Manufacturing of Advanced Materials - Berlin, Germany
Duration: 25 Aug 200929 Aug 2009

Publication series

NameMaterials Science Forum
Volume638-642
ISSN (Print)0255-5476

Conference

Conference6th International Conference on Processing and Manufacturing of Advanced Materials
Abbreviated titleTHERMEC 2009
CountryGermany
CityBerlin
Period25/08/0929/08/09

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Keywords

  • ATI Allvac® 718Plus™
  • Delta
  • Gamma prime
  • Precipitation kinetics
  • Superalloy

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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