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The Effect of Hot Band Annealing and Cooling on the Microstructure of 3.2% Si NonOriented Electrical Steels / CALLUM JONES

Swansea University Author: CALLUM JONES

  • E-Thesis – open access under embargo until: 11th June 2027

DOI (Published version): 10.23889/SUThesis.66961

Abstract

This project investigated the effect of the hot band annealing process on the properties of 3.2 wt.% Si non-grain oriented electrical steels with compositions at the extremes of the specification range (between 3.2 and 3.5 wt.% Si). Electron backscatter diffraction was used to characterise both micr...

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Published: Swansea University, Wales, UK 2024
Institution: Swansea University
Degree level: Doctoral
Degree name: EngD
Supervisor: Coleman, M. & Robinson, F.
URI: https://cronfa.swan.ac.uk/Record/cronfa66961
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spelling v2 66961 2024-07-04 The Effect of Hot Band Annealing and Cooling on the Microstructure of 3.2% Si NonOriented Electrical Steels b7c4d74e17073f7515da027800f1eb51 CALLUM JONES CALLUM JONES true false 2024-07-04 This project investigated the effect of the hot band annealing process on the properties of 3.2 wt.% Si non-grain oriented electrical steels with compositions at the extremes of the specification range (between 3.2 and 3.5 wt.% Si). Electron backscatter diffraction was used to characterise both microstructure and texture. A general examination of industrial hot band and hot band annealed samples found an inhomogeneous microstructure and texture distribution through the cross section of the hot band and often incomplete recrystallization in the annealed state. Persistent pancake shaped grains were found to have recovered dynamically during hot rolling which prevented recrystallization from occurring during the subsequent annealing, independent of texture. Slow cooling rates from the annealing temperature of 940 ˚C to less than 50 ˚C were found to complete recrystallization in samples where persistent 훼 − 푓푖푏푟푒 grains were previously present whilst the less prevalent {110}〈001〉 Goss grains would remain. Increasing the annealing temperature from 940 ˚C to 960 ˚C whilst keeping the heating rate constant and varying the cooling rate, resulted in a similar recrystallization outcome with an undesirable excessively large grain size. Finally, a quasi in-situ experiment to track the recrystallization process during annealing found an onset of recrystallization at 930 ˚C. A relationship was found between deformed regions of certain texture recrystallizing into specific orientations. The large stubborn grains were found to be slowly consumed by neighbouring grains through a process termed ‘bulging’. This developed new knowledge has led to recommendations for the optimum hot band annealing cycle to be applied at the industrial sponsor together with greater understanding of the mechanism for the evolution of extreme brittleness caused by large grains in some 3.2 wt.% silicon hot band annealed coils. E-Thesis Swansea University, Wales, UK electrical steel, hot band annealing, cooling rate, hot rolling, recrystallization 11 6 2024 2024-06-11 10.23889/SUThesis.66961 A selection of content is redacted or is partially redacted from this thesis to protect sensitive and personal information. COLLEGE NANME COLLEGE CODE Swansea University Coleman, M. & Robinson, F. Doctoral EngD Cogent (Tata Steel), European Social Fund via the Welsh Government Cogent (Tata Steel), European Social Fund via the Welsh Government 2024-07-04T15:42:27.9963887 2024-07-04T15:23:26.2251338 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering CALLUM JONES 1 Under embargo Under embargo 2024-07-04T15:28:41.2050357 Output 16160105 application/pdf E-Thesis – open access true 2027-06-11T00:00:00.0000000 Copyright: The Author, Callum Peris Jones, 2023 true eng
title The Effect of Hot Band Annealing and Cooling on the Microstructure of 3.2% Si NonOriented Electrical Steels
spellingShingle The Effect of Hot Band Annealing and Cooling on the Microstructure of 3.2% Si NonOriented Electrical Steels
CALLUM JONES
title_short The Effect of Hot Band Annealing and Cooling on the Microstructure of 3.2% Si NonOriented Electrical Steels
title_full The Effect of Hot Band Annealing and Cooling on the Microstructure of 3.2% Si NonOriented Electrical Steels
title_fullStr The Effect of Hot Band Annealing and Cooling on the Microstructure of 3.2% Si NonOriented Electrical Steels
title_full_unstemmed The Effect of Hot Band Annealing and Cooling on the Microstructure of 3.2% Si NonOriented Electrical Steels
title_sort The Effect of Hot Band Annealing and Cooling on the Microstructure of 3.2% Si NonOriented Electrical Steels
author_id_str_mv b7c4d74e17073f7515da027800f1eb51
author_id_fullname_str_mv b7c4d74e17073f7515da027800f1eb51_***_CALLUM JONES
author CALLUM JONES
author2 CALLUM JONES
format E-Thesis
publishDate 2024
institution Swansea University
doi_str_mv 10.23889/SUThesis.66961
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Materials Science and Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Materials Science and Engineering
document_store_str 0
active_str 0
description This project investigated the effect of the hot band annealing process on the properties of 3.2 wt.% Si non-grain oriented electrical steels with compositions at the extremes of the specification range (between 3.2 and 3.5 wt.% Si). Electron backscatter diffraction was used to characterise both microstructure and texture. A general examination of industrial hot band and hot band annealed samples found an inhomogeneous microstructure and texture distribution through the cross section of the hot band and often incomplete recrystallization in the annealed state. Persistent pancake shaped grains were found to have recovered dynamically during hot rolling which prevented recrystallization from occurring during the subsequent annealing, independent of texture. Slow cooling rates from the annealing temperature of 940 ˚C to less than 50 ˚C were found to complete recrystallization in samples where persistent 훼 − 푓푖푏푟푒 grains were previously present whilst the less prevalent {110}〈001〉 Goss grains would remain. Increasing the annealing temperature from 940 ˚C to 960 ˚C whilst keeping the heating rate constant and varying the cooling rate, resulted in a similar recrystallization outcome with an undesirable excessively large grain size. Finally, a quasi in-situ experiment to track the recrystallization process during annealing found an onset of recrystallization at 930 ˚C. A relationship was found between deformed regions of certain texture recrystallizing into specific orientations. The large stubborn grains were found to be slowly consumed by neighbouring grains through a process termed ‘bulging’. This developed new knowledge has led to recommendations for the optimum hot band annealing cycle to be applied at the industrial sponsor together with greater understanding of the mechanism for the evolution of extreme brittleness caused by large grains in some 3.2 wt.% silicon hot band annealed coils.
published_date 2024-06-11T15:42:27Z
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score 11.0267

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