Effect of strain hardening on precipitation kinetics in ATI 718Plus

Bilal Hassan, Yann Jansen, Sebastien Nouveau, Jonathan Corney

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ATI 718Plus components are manufactured by forging a wrought billet in stages to obtain the desired geometry and microstructure. Parts are then heat treated to optimized proportions of γ’ and η phases. η phase is a plate-like phase that precipitates on the grain boundaries of ATI 718Plus, similar to δ phase in Inconel 718. However, the complete kinetic behaviour of η phase precipitation during forging and heat treatment is still not fully understood. This paper investigates the effects of strain hardening on η phase precipitation kinetics in ATI 718Plus. This is achieved through the use of isothermal hot compression tests and heat treatment. Strain hardening was found to affect the η precipitation kinetics considerably. The results reported are a contribution to a fuller understanding of this important process.

Original languageEnglish
Pages (from-to)167-172
Number of pages6
JournalMaterials Science Forum
Publication statusPublished - 25 Sept 2017
Event10th International Conference on Materials Science and Engineering, BraMat 2017 - Brasov
Duration: 8 Mar 201711 Mar 2017


  • ATI 718Plus
  • eta phase
  • precipitation kinetics
  • strain hardening
  • η phase


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