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Disparity in recrystallization of α- & γ-fibers and its impact on Cube texture formation in non-oriented electrical steel

Diween Hawezy, Soran Birosca

Acta Materialia, Volume: 216, Start page: 117141

Swansea University Author: Diween Hawezy

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Abstract

An investigation into the recovery and recrystallization of the two major texture fibres, namely α and γ, during annealing yielded subtle differences between the two. It is reported that with thermal activation static recovery occurs, where dislocation free sub-grains are formed and tend to grow, co...

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Published in: Acta Materialia
ISSN: 1359-6454
Published: Elsevier BV 2021
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URI: https://cronfa.swan.ac.uk/Record/cronfa57323
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Abstract: An investigation into the recovery and recrystallization of the two major texture fibres, namely α and γ, during annealing yielded subtle differences between the two. It is reported that with thermal activation static recovery occurs, where dislocation free sub-grains are formed and tend to grow, coalesce, or bulge out. This can form new strain-free recrystallisation nuclei, with the coalescence or bulging phenomenon depending on stored energy and geometrically dislocation density (GND). Due to low lattice curvature or otherwise, it was found α-fiber has low stored energy and GND values which favours bulging into neighbouring deformed grains as opposed to subgrain coalescence. In contrast, γ-fiber tends to undergo rapid subgrain coalescence due to high lattice curvature, i.e., GND and stored energy. The newly formed grains from both texture fibers were also found to typically differ in size, as γ-fiber has a much higher nucleation rate with rapid subgrain coalescence. Furthermore, it was discovered that Cube texture component though nucleating in higher rates within α-fiber, nucleates in all regions of high dislocation densities but will only survive in regions with low recovery and nucleation rates, typically α-fiber. Moreover, Goss texture component was found to preferentially nucleate from γ-fiber.
Item Description: https://researchportal.port.ac.uk/portal/en/publications/disparity-in-recrystallization-of---fibers-and-its-impact-on-cube-texture-formation-in-nonoriented-electrical-steel(8849c687-047d-40c3-b74e-b215d2b09b19).html
Keywords: Recovery, Recrystallization, Texture Evolution, Fibre Texture, Electrical Steel
College: College of Engineering
Start Page: 117141