The effect of strain and temperature profiles on static recrystallization during solution heat treatment after hot deformation of alloy 718

Richard Watson, Michael Preuss, João Quinta Da Fonseca, Thomas Witulski, Gregor Terlinde

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

3 Citations (Scopus)

Abstract

An investigation into the effect of temperature and strain gradients on recrystallization during solution heat treatment has been performed on Alloy 718 test pieces. High temperature compression experiments were carried out using a Gleeble, which generates strain and temperature gradients within the compression sample. The initial results have shown there is a band in the deformation transition zone where large abnormally coarse grains manifest after solution heat treatment. Detailed analysis by Electron Backscatter Diffraction (EBSD) was carried out to determine grain characteristics as well as δ phase distribution and morphology. Grains produced via this abnormal grain coarsening are characterised by a large percentage of twin boundaries. The grain growth also appears to be immune to the effects of boundary pinning by δ phase particles. The results suggest that stored energy gradients may be the key to this phenomenon.

Original languageEnglish
Title of host publication8th International Symposium on Superalloy 718 and Derivatives 2014
EditorsEric Ott, Anthony Banik, Joel Andersson, Ian Dempster, Tim Gabb, Jon Groh, Karl Heck, Randy Helmink, Xingbo Liu, Agnieszka Wusatowska-Sarnek
PublisherJohn Wiley & Sons
Pages873-884
Number of pages12
ISBN (Electronic)9781634396424
DOIs
Publication statusPublished - 2014
Externally publishedYes
EventInternational Symposium on Superalloy 718 and Derivatives 2014 - Pittsburgh, United States of America
Duration: 28 Sep 20141 Oct 2014
Conference number: 8th

Publication series

Name8th International Symposium on Superalloy 718 and Derivatives 2014

Conference

ConferenceInternational Symposium on Superalloy 718 and Derivatives 2014
Country/TerritoryUnited States of America
CityPittsburgh
Period28/09/141/10/14

Keywords

  • EBSD
  • Microstructure Evaluation
  • Recrystallization
  • Thermomechanical processing

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