In situ high-temperature EBSD and 3D phase field studies of the austenite-ferrite transformation in a medium Mn steel

Hussein Farahani*, Gerrit Zijlstra, Maria Giuseppina Mecozzi, Václav Ocelík, Jeff Th M. De Hosson, Sybrand Van Der Zwaag

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

9 Citations (Scopus)
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In this research, in situ high-temperature electron backscattered diffraction (EBSD) mapping is applied to record and analyze the migration of the α/3 interfaces during cyclic austenite-ferrite phase transformations in a medium manganese steel. The experimental study is supplemented with related 3D phase field (PF) simulations to better understand the 2D EBSD observations in the context of the 3D transformation events taking place below the surface. The in situ EBSD observations and PF simulations show an overall transformation behavior qualitatively similar to that measured in dilatometry. The behavior and kinetics of individual austenite-ferrite interfaces during the transformation is found to have a wide scatter around the average interface behavior deduced on the basis of the dilatometric measurements. The trajectories of selected characteristic interfaces are analyzed in detail and yield insight into the effect of local conditions in the vicinity of interfaces on their motion, as well as the misguiding effects of 2D observations of processes taking place in 3D.

Original languageEnglish
Pages (from-to)639-655
JournalMicroscopy and Microanalysis
Issue number3
Publication statusPublished - 2019

Bibliographical note

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project
Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.


  • austenite-ferrite interface migration
  • cyclic partial phase transformations
  • EBSD
  • medium manganese steel
  • phase field simulation
  • steel


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