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Master's Dissertation
DOI
https://doi.org/10.11606/D.3.2011.tde-06052011-122109
Document
Author
Full name
Eduardo Cavalcante da Silva
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2011
Supervisor
Committee
Landgraf, Fernando José Gomes (President)
Campos, Marcos Flávio de
Wiebeck, Hélio
Title in Portuguese
A influência do recozimento descarbonetante nas propriedades magnéticas de aços para fins elétricos.
Keywords in Portuguese
Aço elétrico
Recristalização e perdas magnéticas
Abstract in Portuguese
Este trabalho analisa o efeito da descarbonetação nas perdas magnéticas de aços elétricos semiprocessados, após recozimento final, descarbonetante e/ou não-descarbonetante. Neste trabalho foi utilizado um aço de baixo carbono (600ppm de C) encruado a 4-6% de deformação, tipo COSCORE 55O. Foi notado que o recozimento descarbonetante reduz rapidamente (poucos minutos de tratamento térmico) o teor de carbono do aço a níveis baixos (abaixo de 100ppm de C), reduzindo também as Perdas magnéticas totais (abaixo de 10W/Kg). Verifica-se que recozimentos de 20 e 40 minutos são tempos suficientes para produzir aços com baixas Perdas e baixo teor de C. É mostrado também que recozimento descarbonetante influencia na recristalização de aços carbono encruado. Verificou-se que, durante recozimento descarbonetante, o espaçamento entre as lâminas influenciou a microestrutura e as perdas magnéticas do material. A análise de Textura cristalográfica do material revela que quanto maior o nível de umidade do ensaio, maior a redução da intensidade de fibra Gama, (111)//DN, e aumento da intensidade de textura cristalográfica Goss, ou seja, grãos com orientação cristalográfica, (110)// de grande intensidade é obtido.
Title in English
The influence of decarburizing annealing on magnetic properties of electrical steels.
Keywords in English
Electrical steel
Recrystallization and magnetic losses
Abstract in English
This work analyzes the effects of decarburizing annealing on the magnetic, microstructure and texture properties of semiprocessed electrical steels after annealing. A rolles low-carbon electrical steel (0,06%wt/wt Carbon) sheet was used in the experiments. It was verified that decarburizing annealings decrease quickly carbon content (after few minutes of thermal treatment) to levels lower than 100ppm, and after annealing the magnetic losses fastly decreases until below 10W/Kg. It was seen that decarburizing annealings for 20 and 40 minutes are enough to produce low magnetic losses and low carbon content steels. The annealings resulted in low magnetic losses steels whenever microstructure recrystallization has occurred, associated with decarburization. It was noticed that, during decarburizing annealing, the spacing between sheets affected the microstructure and magnetic losses of the material. Crystallographic texture analysis of material reveals that the bigger the annealing humidity, Gama fiber, (111)//DN, decreases and Goss texture, (110)//, increases.
 
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Publishing Date
2011-05-19
 
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