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Non-grain oriented electrical steel photomicrograph classification using transf...
Ivo, Roberto Fernandes; Rodrigues, Douglas de Araújo; Bezerra, Gabriel Maia; Freitas, Francisco Nélio Costa; Abreu, Hamilton Ferreira Gomes deAmong the many factors that contribute to achieving a sustainable and efficient economy is the raw material of machinery and equipment of strategic sectors. Non-grain oriented (NGO) electrical steel is used in the manufacturing of electric motors. Therefore, it is directly related to the electromagnetic efficiency of engines both in industry and in homes. This work aims to develop an intelligent 1.26% Si NGO el...
New approach to evaluate a non-grain oriented electrical steel electromagnetic ...
Rebouças Filho, Pedro Pedrosa; Santos, José Ciro dos; Freitas, Francisco Nélio Costa; Rodrigues, Douglas de Araújo; Ivo, Roberto FernandesThe growing global demand for energy makes it necessary to adopt measures ranging from the exploration of new energy sources to the development of technology for machinery and equipment with greater energy efficiency. Non-grain oriented electrical steels are widely used in the construction of rotors and stators that form the core of electric motors, and their microstructures are directly related to its electrom...
Study and classification of the Crystallographic Orientation Distribution Funct...
Ivo, Roberto Fernandes; Rodrigues, Douglas de Araújo; Santos, José Ciro dos; Freitas, Francisco Nélio Costa; Herculano, Luís Flávio GasparThis article discusses a fast and efficient classification of non-grain oriented electrical steel and its electromagnetic efficiency based on the analysis of the images of the Crystalline Orientation Distribution Function (CODF). The study was carried out on samples of a non-grain oriented electrical steel, semi-processed with 1.28% silicon, cold rolled with thickness reductions of 50.0% and 70.0%, and annealed...
Characterization of the evolution of recrystallization by fluctuation and fract...
Silva, Francisco Estênio da; Freitas, Francisco Nélio Costa; Abreu, Hamilton Ferreira Gomes de; Gonçalves, Lindberg Lima; Moura, Elineudo Pinho deSilicon steels with non-oriented grains are widely used in the fabrication of electrical motor nucleus where a low magnetic loss is an important point. The performance of these motors is affected by the level of recrystallization of these steels which can come from the steel plant in a semi-processed condition. In this condition, they have a partially deformed structure and are submitted to an adequate annealin...
Influência da recristalização na textura cristalográfica e nas perdas magnética...
Freitas, Francisco Nélio Costa; Abreu, Hamilton Ferreira Gomes de; Silva, Marcelo José Gomes daNon-oriented electrical steels are widely used in the manufacture of cores for electric motors being the performance of this equipment affected by the presence of crystallographic texture in these materials. In other hand, the grain size considerably affects the magnetic losses. The crystallographic texture and grain size are greatly influenced by the annealing process performed after cold rolling of these stee...
Classificação automática do tipo de ferro fundido utilizando reconhecimento de ...
Rodrigues, Douglas de Araújo; Santos, Gesilane Pereira dos; Fernandes, Marcelo Correia; Santos, José Ciro dos; Freitas, Francisco Nélio CostaThe cast iron has a microstructure in which the shape of the contained graphite has direct influence in the classification between the several types of this material. The classification is usually made through a visual analysis performed by a specialist using an optical microscope. This work proposes the use of Applied Computational Intelligence in conjunction with extractors of information in metallographic im...
Influência da recristalização no comportamento da textura cristalográfica e nas...
Freitas, Francisco Nélio CostaNon-oriented electrical steels are widely used in the manufacture of cores for electric motors being the performance of this equipment affected by the presence of crystallographic texture in these materials. In other hand, the grain size considerably affects the magnetic losses. The crystallographic texture and grain size are greatly influenced by the annealing process performed after cold rolling of these stee...
Adequabilidade das condições de laminação de um aço baixo-carbono à estampagem ...
Freitas, Francisco Nélio CostaSome properties of polycrystalline materials depends on the direction in which they are measured. This is due to the occurrence of texture, i. e., a preferred orientation developed by the crystallites that is caused by, for example, a plastic deformation process or a heat treatment. Texture influences materials properties in a beneficial as well as a deleterious way. In the case of drawing soft drink cans, the ...