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Study of the tension annealing influence on magnetic loss and magnetostriction of electrical steel (Fe-Si) under compressive stress

Grant number: 17/11645-3
Support type:Scholarships in Brazil - Post-Doctorate
Effective date (Start): October 01, 2017
Effective date (End): November 30, 2019
Field of knowledge:Engineering - Materials and Metallurgical Engineering - Physical Metallurgy
Principal Investigator:Fernando Jose Gomes Landgraf
Grantee:Mateus Botani de Souza Dias
Home Institution: Escola Politécnica (EP). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Associated scholarship(s):18/15125-7 - Theoretical and experimental analysis of loss in go steels from DC to kHz range, BE.EP.PD


The Fe-Si steels are widely used in the transformers cores. Although the first study of Fe-Si magnetic losses have occurred at 1900, the environmental concern has encouraged the electrical steel manufacturers to improve this alloys.Unfortunately, the rotational magnetization and the magnetic cores clamp could produce compressive stress which increases the transformers magnetic loss and noise (generate by magnetostriction). Therefore, the study of new proceedings which softening the effects of stress on magnetic properties of Fe-Si alloys is desired.The present work purpose to introduce a magnetocrystalline anisotropy in the grain oriented electrical steel (Fe-Si) sheets using a tension annealing. As consequence, it is expected that when a compressive stress is applied, the annealed sheets have lower values of magnetostriction and magnetic loss than the unannealed sheets. Therefore, the annealed material could improve the transformer performance.To infer if the tension annealing produced the desired effects, the GO electrical steel will be compressed at rolling direction while a Single Sheet Tester and a Wheatstone Bridge will measure the magnetic losses and magnetostriction, respectively.

Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
DIAS, M. B. S.; BENTANCOUR, D. P. M.; ARAUJO, F. G. P.; SANTOS, A. D.; LANDGRAF, F. J. G. Power loss reduction of uncoated grain oriented electrical steel using annealing under stress treatment. Journal of Magnetism and Magnetic Materials, v. 504, JUN 15 2020. Web of Science Citations: 0.
DIAS, M. B. S.; LANDGRAF, F. J. G. Compressive stress effects on magnetic properties of uncoated grain oriented electrical steel. Journal of Magnetism and Magnetic Materials, v. 504, JUN 15 2020. Web of Science Citations: 0.

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