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Mechanistic approach of Goss abnormal grain growth in electrical steel: Theory and argument

Soran Birosca Orcid Logo, Ali Nadoum, Diween Hawezy, Fiona Robinson, Winfried Kockelmann

Acta Materialia, Volume: 185, Pages: 370 - 381

Swansea University Author: Soran Birosca Orcid Logo

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DOI (Published version): 10.1016/j.actamat.2019.12.023

Abstract

The first Si-Fe electrical steel was produced in 1905, and the grain-oriented steel was discovered in 1930 after Goss demonstrated how optimal combinations of heat treatment and cold rolling could produce a texture giving Si-Fe strip good magnetic properties when magnetised along its rolling directi...

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Published in: Acta Materialia
ISSN: 1359-6454
Published: Elsevier BV 2020
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa53113
Abstract: The first Si-Fe electrical steel was produced in 1905, and the grain-oriented steel was discovered in 1930 after Goss demonstrated how optimal combinations of heat treatment and cold rolling could produce a texture giving Si-Fe strip good magnetic properties when magnetised along its rolling direction. This technology has reduced the power loss in transformers greatly and remains the basis of the manufacturing process today. Since then many postulations reported on the mechanism on abnormal grain growth (AGG) which is the key for Si-Fe superior magnetic properties, however, none have provided a concrete understanding of this phenomenon. Here, we established and demonstrated a new theory that underlines the fundamental mechanistic approach of abnormal grain growth in 3% Si-Fe steel. It is demonstrated, that the external heat flux direction applied during annealing and Si atom positions in the solid solution disordered α-Fe cube unit cell that cause lattice distortions and BCC symmetry reduction are the most influential factors in the early stage of Goss AGG than what was previously thought to be dislocation related stored energy, grain boundary characteristics and grain size/orientation advantages.
Keywords: Abnormal grain growth, Electrical steel, EBSD, Heat flow, Goss texture, Geometrically necessary dislocation, Neutron texture analysis
Start Page: 370
End Page: 381

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