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In Situ High-Temperature EBSD and 3D Phase Field Studies of the Austenite–Ferrite Transformation in a Medium Mn Steel

Published online by Cambridge University Press:  12 April 2019

Hussein Farahani Open the ORCID record for Hussein Farahani [Opens in a new window] ,
Gerrit Zijlstra ,
Maria Giuseppina Mecozzi ,
Václav Ocelík ,
Jeff Th. M. De Hosson  and
Sybrand van der Zwaag
Hussein Farahani*
Affiliation:
Novel Aerospace Materials group, Faculty of Aerospace Engineering, Delft University of Technology, 2629 HS Delft, The Netherlands Department of Materials Science and Engineering, Delft University of Technology, 2628 CD Delft, The Netherlands
Gerrit Zijlstra
Affiliation:
Department of Applied Physics, Materials Innovation Institute and Zernike Institute for Advanced Materials, University of Groningen, 9747 AG Groningen, The Netherlands
Maria Giuseppina Mecozzi
Affiliation:
Department of Materials Science and Engineering, Delft University of Technology, 2628 CD Delft, The Netherlands
Václav Ocelík
Affiliation:
Department of Applied Physics, Materials Innovation Institute and Zernike Institute for Advanced Materials, University of Groningen, 9747 AG Groningen, The Netherlands
Jeff Th. M. De Hosson
Affiliation:
Department of Applied Physics, Materials Innovation Institute and Zernike Institute for Advanced Materials, University of Groningen, 9747 AG Groningen, The Netherlands
Sybrand van der Zwaag
Affiliation:
Novel Aerospace Materials group, Faculty of Aerospace Engineering, Delft University of Technology, 2629 HS Delft, The Netherlands School of Materials Science and Engineering, Tsinghua University, Beijing, China
*
*Author for correspondence: H. Farahani, E-mail: H.Farahani@tudelft.nl
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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/γ 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.

Keywords

austenite–ferrite interface migrationcyclic partial phase transformationsEBSDmedium manganese steelphase field simulationsteel
Type
Materials Applications
Information
Microscopy and Microanalysis , Volume 25 , Issue 3 , June 2019 , pp. 639 - 655
Copyright
Copyright © Microscopy Society of America 2019 

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