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Metals 2016, 6(12), 317;

Detection of the Magnetic Easy Direction in Steels Using Induced Magnetic Fields

Instituto Federal de Educacao, Ciencia e Tecnologia da Paraiba, Rua Jose Americo de Almeida, 707-Nordeste I, Guarabira, Joao Pessoa-PB 58200-000, Brazil
Universidade Federal da Paraiba, Jardim Universitario, s/n-Castelo Branco, Joao Pessoa-PB 58051-900, Brazil
Centro de Ciências e Tecnologia, Universidade Federal de Campina Grande, R. Aprigio Veloso, 882, Campina Grande-PB 58429-900, Brazil
Programa de Pos-Graduacao em Informatica Aplicada, Universidade de Fortaleza, Av. Washington Soares, 1321, Edson Queiroz, Fortaleza-CE 60811-905, Brazil
Instituto de Ciencia e Inovacao em Engenharia Mecanica e Engenharia Industrial, Departamento de Engenharia Mecanica, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias s/n, 4200-465 Porto, Portugal
Author to whom correspondence should be addressed.
Academic Editor: Hugo F. Lopez
Received: 30 September 2016 / Revised: 25 November 2016 / Accepted: 8 December 2016 / Published: 15 December 2016
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Conventional manufacturing processes cause plastic deformation that leads to magnetic anisotropy in processed materials. A deeper understanding of materials characterization under rotational magnetization enables engineers to optimize the overall volume, mass, and performance of devices such as electrical machines in industry. Therefore, it is important to find the magnetic easy direction of the magnetic domains in a simple and straightforward manner. The Magnetic easy direction can be obtained through destructive tests such as the Epstein frame method and the Single Sheet Tester by taking measurements in regions of irreversible magnetization usually called domains. In the present work, samples of rolled SAE 1045 steel (formed by perlite and ferrite microstructures) were submitted to induced magnetic fields in the reversibility region of magnetic domains to detect the magnetic easy direction. The magnetic fields were applied to circular samples with different thicknesses and angles varying from 0° to 360° with steps of 45°. A square sample with a fixed thickness was also tested. The results showed that the proposed non-destructive approach is promising to evaluate the magnetic anisotropy in steels independently of the geometry of the sample. The region studied presented low induction losses and was affected by magnetic anisotropy, which did not occur in other works that only took into account regions of high induction losses. View Full-Text
Keywords: magnetic anisotropy; reversibility domain region; induced magnetic field; non-destructive test; plain-carbon steel; SAE 1045 magnetic anisotropy; reversibility domain region; induced magnetic field; non-destructive test; plain-carbon steel; SAE 1045

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Silva, E.M.; Paula, A.M.R.; Leite, J.P.; Leite, J.P.; Andrade, L.S.S.; De Albuquerque, V.H.C.; Tavares, J.M.R.S. Detection of the Magnetic Easy Direction in Steels Using Induced Magnetic Fields. Metals 2016, 6, 317.

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