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

Journal Article (2019)
Author(s)

H Farahani (TU Delft - Novel Aerospace Materials, TU Delft - (OLD) MSE-3)

Gerrit Zijlstra (Rijksuniversiteit Groningen)

M. G. Mecozzi (TU Delft - (OLD) MSE-3)

Václav Ocelik (Rijksuniversiteit Groningen)

J. Th M. De Hosson (Rijksuniversiteit Groningen)

S Van der ZWAAG (Tsinghua University, TU Delft - Novel Aerospace Materials)

Research Group
(OLD) MSE-3
Copyright
© 2019 H. Farahani, Gerrit Zijlstra, M.G. Mecozzi, Václav Ocelík, Jeff Th M. De Hosson, S. van der Zwaag
DOI related publication
https://doi.org/10.1017/S143192761900031X
More Info
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Publication Year
2019
Language
English
Copyright
© 2019 H. Farahani, Gerrit Zijlstra, M.G. Mecozzi, Václav Ocelík, Jeff Th M. De Hosson, S. van der Zwaag
Research Group
(OLD) MSE-3
Issue number
3
Volume number
25
Pages (from-to)
639-655
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Abstract

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.

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