University of Oulu

M.R. Kamali, A.R. Mashreghi, L.P. Karjalainen, S. Hasani, V. Javaheri, M. Seiyedbeigi, J. Kömi, Impact of annealing treatment on the microstructural-dependent mechanical properties of a cold-rolled Fe–Co–10V alloy, Materials Science and Engineering: A, Volume 821, 2021, 141595, ISSN 0921-5093, https://doi.org/10.1016/j.msea.2021.141595

Impact of annealing treatment on the microstructural-dependent mechanical properties of a cold-rolled Fe–Co–10V alloy

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Author: Kamali, M. R.1; Mashreghi, A. R.1; Karjalainen, L. P.2;
Organizations: 1Department of Mining and Metallurgical Engineering, Yazd University, Yazd, Iran
2Centre for Advanced Steels Research, University of Oulu, P.O. Box 4200, FI-90014, Oulu, Finland
3Department of Materials Engineering, Malek Ashtar University of Technology, Isfahan, Iran
Format: article
Version: accepted version
Access: embargoed
Persistent link: http://urn.fi/urn:nbn:fi-fe2022012811163
Language: English
Published: Elsevier, 2021
Publish Date: 2023-06-17
Description:

Abstract

Various contributors have been suggested so far to explain the variation of mechanical properties of Fe–Co–V magnetic alloys, but a comprehensive understanding is still lacking. In the present study, the variation of hardness, tensile yield strength (YS), and elongation at room temperature were determined for an 86% cold-rolled Fe–50Co–10V (wt.%) alloy after annealing at the temperature range of 300–1050 °C for holding times from 10 to 240 min. The potential contributing factors were analyzed and discussed. Detailed microstructural evolution and magnetic properties have been reported earlier for this alloy. The results showed an increase in hardness and YS but a reduction in elongation after annealing at temperatures between 450 and 550 °C for all holding times. The activation energy of the contributing process in increasing the hardness after annealing between 300 and 550 °C was 132–144 kJ/mol, being a typical value for the ordering transition in ferrite in Fe–Co and Fe–Co–2V alloys. The YS increased up to an annealing temperature of 450 °C, followed by a decreasing trend at higher annealing temperatures even in the ordered state, obviously due to i) the recovery and recrystallization of ferrite, ii) decreasing the number of (Co,Fe)₂V precipitates and iii) increasing fraction of retained austenite. The elongation decreased to nil after annealing at 450–550 °C, but it was improved even in the ordered state at 600 °C and above due to the same factors which decreased the YS. The intergranular failure mode after annealing below 600 °C converted to ductile mode at 650 °C. Considering the combination of mechanical and magnetic properties, the annealing treatment at 650 °C for 10 min can be recommended for this alloy, providing high YS, a few percent elongation, and high magnetic hardness.

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Series: Materials science & engineering. A, Structural materials: properties, microstructure and processing
ISSN: 0921-5093
ISSN-E: 1873-4936
ISSN-L: 0921-5093
Volume: 821
Article number: 141595
DOI: 10.1016/j.msea.2021.141595
OADOI: https://oadoi.org/10.1016/j.msea.2021.141595
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Subjects:
Funding: M.R.K is grateful for financial support from the Iranian government for his research stay at the University of Oulu and for the facilities and equipment provided by the University of Oulu for performing this study. L.P.K, V.J, and J.K acknowledge the support of the Academy of Finland for the “Genome of Steel” project #311934.
Copyright information: © 2021. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/.
  https://creativecommons.org/licenses/by-nc-nd/4.0/