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Interphase boundary motion elucidated through in-situ high temperature electron back-scatter diffraction

Zijlstra, G., van Daalen, M. S. B., Vainchtein, D. I., Ocelik, V. & de Hosson, J. T. M., 15-Oct-2017, In : Materials & design. 132, p. 138-147 10 p.

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  • Interphase boundary motion elucidated through in-situ high temperature electron back-scatter diffraction

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In this work we concentrate on the in situ dynamics of interphase boundary motion during transformations. Insitu high temperature electron-back scatter diffraction (HT EBSD) was employed to study the ferrite-austenite-ferrite transformation in low carbon steel. A novel method was designed to derive the velocity of the interphase boundaries from the EBSD phase maps. It is concluded that the motion of the transformation front occurs in a jerky-type motion, i.e. not continuous in time on a microscale, as the Johnson-Mehl-Avrami-Kolmogorov (JMAK) equation would predict on themacro-scale. It is shown that HT EBSD is capable of providing relevant supplementary insight in the ferrite-austenite phase transformations with adequate spatiotemporal resolution, which would remain hidden in volume averaging experimental techniques such as X-Ray diffraction. In particular, ferrite-austenite phase boundary velocities between 1.4 +/- 0.3 and 4.0 +/- 0.2 nm/s were detected during isochronal heating with 0.5 degrees C/min. The mean interphase boundary velocity was ranging between 5.0 +/- 0.2 and 6.4 +/- 0.2 nm/s for austenite-ferrite transformation with a cooling rate of 1 degrees C/min. Ledge growth at isothermal conditions, resulted in velocity of 23 nm/s along phase boundary. A strong dependency of interphase boundary mobility and parent-daughter phase boundary misorientation angles was not found. (C) 2017 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)138-147
Number of pages10
JournalMaterials & design
Volume132
Publication statusPublished - 15-Oct-2017

    Keywords

  • High temperature EBSD, In-situ, Ferrite, Austenite, Phase boundary migration, JMAK
Related Datasets
  1. In-situ High Temperature Electron Back-Scatter Diffraction (HT EBSD) maps

    Hussein, F. (Creator), Zijlstra, G. (Creator), Ocelik, V. (Creator), Hosson, de, J. (Creator), van der Zwaag, S. (Creator), University of Groningen, 31-Aug-2018

    Dataset

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ID: 44366783