University of Oulu

Mohammad R. Kamali, L. Pentti Karjalainen, Ali R. Mashregi, Saeed Hasani, Vahid Javaheri, Jukka Kömi, Reobservations of ferrite recrystallization in a cold-rolled ordered Fe–50Co–10V alloy using the EBSD method, Materials Characterization, Volume 158, 2019, 109962, ISSN 1044-5803, https://doi.org/10.1016/j.matchar.2019.109962

Reobservations of ferrite recrystallization in a cold-rolled ordered Fe–50Co–10V alloy using the EBSD method

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Author: Kamali, Mohammad R.1,2; Karjalainen, L. Pentti1; Mashregi, Ali R.2;
Organizations: 1Centre for Advanced Steels Research, University of Oulu, P.O. Box 4200, FI-90014, Oulu, Finland
2Department of Mining and Metallurgical Engineering, Yazd University, Yazd, Iran
Format: article
Version: accepted version
Access: embargoed
Persistent link: http://urn.fi/urn:nbn:fi-fe2019110436535
Language: English
Published: Elsevier, 2019
Publish Date: 2021-10-23
Description:

Abstract

Even after extensive research for decades on cold-rolled magnetic Fe–Co–V alloys, many aspects of ferrite recrystallization are still unclear. In order to analyse the progress of recrystallization in an Fe–50Co–10 V (in wt.%) alloy, different thermal cycles were conducted for an 86% cold-rolled thin sheet (∼140 μm). A comprehensive phase characterization and texture analysis were carried out using X-ray diffraction and scanning electron microscopy. To investigate the ferrite recrystallization during concurrent ordering and austenite transformation processes, the utilization of several methods such as the Kernel Average Misorientation and Grain Orientation Spread analyses together with grain boundary misorientation and grain size distributions, and characterization of microstructure by electron backscatter diffraction were crucial. The austenite transformation, detected to start at 500–550 °C, complicated the determination of the recrystallization kinetics; however, it was clarified by the present multi-parameter analyses. The ferrite recrystallization was found to initiate at 600 °C within 1 h and progress by the continuous recrystallization mechanism. The typical gamma-fiber texture of the cold-rolled alloy remained almost unchanged upon annealing temperatures up to 750 °C, also confirming the continuous recrystallization mechanism, similarly as the grain boundary misorientation evolution did. The recrystallization kinetics was found to follow the Avrami model with constant exponent in both ordered and disordered states. The recrystallization rate was slow, so that even after 4 h annealing in the disordered state at 750 °C, fragments of ferrite grains with straight sub-boundaries were retained.

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Series: Materials characterization
ISSN: 1044-5803
ISSN-E: 1873-4189
ISSN-L: 1044-5803
Volume: 158
Article number: 109962
DOI: 10.1016/j.matchar.2019.109962
OADOI: https://oadoi.org/10.1016/j.matchar.2019.109962
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Subjects:
Funding: MRK is grateful for financial support from the Iranian government for his research stay at the University of Oulu and for facilities and equipment provided by the University of Oulu for performing this study. LPK and JK acknowledge the support of the Academy of Finland for the “Genome of Steel” project #311934.
Academy of Finland Grant Number: 311934
Detailed Information: 311934 (Academy of Finland Funding decision)
Copyright information: © 2019 Elsevier Inc. All rights reserved.