Development of an experimental procedure to analyses the magnetic domain structures of grain oriented (GO) and non-oriented (GNO) electrical steel sheets

• Grant number: 21/04412-8
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: July 01, 2021
• End date: December 31, 2021
• Field of knowledge: Engineering - Materials and Metallurgical Engineering - Physical Metallurgy
• Principal Investigator: Mateus Botani de Souza Dias
• Grantee: André de Andrade Jabur
• Host Institution: Escola Politécnica (EP). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

The economic growth of a country is directly related to its energy consumption. Therefore, new procedures that reduce power losses of grain oriented electrical steels can produce more efficient transformers, reducing losses at the power grid. Recently, our group has developed some thermomechanical processing (TP) that reduces power losses of electrical steels (oriented and non-oriented), showing that they can improve the transformer's efficiency. It is speculated that this power losses reduction is related to magnetic domains structure. However, this hypothesis stays experimentally unproven since the metallographic preparation is complicated, and the necessity to perform n annealing could eliminate the TP effects. This project aims to develop metallographic procedures that allow the analysis of magnetic domains structures without the necessity of stress relief annealing. Thus, it will be possible to analyses whether, in addition to power losses, TP's also change the magnetic domains structure.

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.; FULOP, G. O.; FARDIN, J. V. B.; NAKAMOTO, M.; IZUKAWA, H.; JABUR, A. A.; LANDGRAF, F. J. G.. Stress annealing effects on magnetic properties of grain oriented electrical steel under compressive stress. Journal of Magnetism and Magnetic Materials, v. 557, p. 7-pg., 2022-09-01. (21/03604-0, 21/04412-8, 21/03926-8, 17/11645-3)