Effect of magnetic aging and inclusions on the magnetic properties of the non-oriented electrical steels applied at high frequencies

• Grant number: 15/15559-9
• Support Opportunities: Regular Research Grants
• Start date: November 01, 2015
• End date: October 31, 2017
• Field of knowledge: Engineering - Materials and Metallurgical Engineering - Physical Metallurgy
• Principal Investigator: Fernando Jose Gomes Landgraf
• Grantee: Fernando Jose Gomes Landgraf
• Host Institution: Escola Politécnica (EP). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Associated researchers: Adriano Alex de Almeida

Abstract

Electrical steels produced currently are materials that had their development and production based on the application for excitation frequencies of 50 and 60 Hz. The microstructural properties before satisfying become, harmful when it is applied to steel frequency of 400 Hz, typically used in hybrid electric vehicle (HEV). This research project aims to test the hypothesis that the presence of inclusions and carbides generated by forced aging reduce anomalous loss (Pa) when the steel is applied at high excitation frequencies. This hypothesis is based on the interaction between particles and domain walls. To test it, the project will use two non-oriented electrical steels containing 340 and 79 ppm C termed as GNO-340 and GNO-079, respectively. To achieve this, NOG-340 steel will be decarburized in order to produce samples with 100 and 200 ppm C. Subsequently the samples generated in the decarburization and as received (GNO-079) will be subjected to heat treatment forced aging with time of 3, 12 and 24 hours at 150 ° C in order to promote the precipitation of carbides Epsilon (µ) and cementite. Therefore, it is expected that the presence of these carbides and inclusions impede the movement of domain walls causing reduced anomalous loss. Thus, it is expect that the decrease of the anomalous loss will be more pronounced by increasing the excitation frequency, due to refinement of magnetic domains. Therefore, the magnetic aging should be able to decrease the total loss since the anomalous loss is the most sensitive portion of the increase in excitation frequency. (AU)

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)

ALMEIDA, ADRIANO A.; PAOLINELLI, SEBASTIAO C.; LANDGRAF, F. J. G.. Effect of the Silicon Content on the Hysteresis Loss of Non-Oriented Steels. IEEE Transactions on Magnetics, v. 55, n. 8, AUG 2019. (15/15559-9)

DE ALMEIDA, ADRITUTO ALEX; GOMES LANDGRAF, FERNANDO JOSE. Magnetic Aging, Anomalous and Hysteresis Losses. MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS, v. 22, n. 3, 2019. (15/15559-9)