Grain boundary precipitation in Inconel 718 and ATI 718Plus

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Abstract

Grain boundary precipitates in Inconel 718 and ATI 718Plus are important to control during hot working processes, since they can control the grain size. Precipitating excessive or insufficient amounts can be detrimental to the final component. Therefore, it is important for manufacturers to understand the formation and kinetics of grain boundary precipitation and the effect this has on mechanical properties. This review considers the background of grain boundary precipitation, including the effect of the thermal stability of γ' and γ" phases. In addition, the effect of stress on the grain boundary phases and their precipitation kinetics in different conditions are also included. Also, the impact of grain boundary precipitation on the mechanical properties is explored.
Original languageEnglish
Pages (from-to)1879-1889
Number of pages11
JournalMaterials Science and Technology
Volume33
Issue number16
Early online date7 Jun 2017
DOIs
Publication statusPublished - 2 Nov 2017

Keywords

  • eta phase
  • delta phase
  • precipitation
  • Inconel 718
  • ATI 718Plus
  • kinetics
  • mechanical properties
  • superalloys

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