Abstract
In the present research, high silicon (6.4%) - iron microcrystalline ribbons were obtained by rapid quenching. In this material the incidence of the atmosphere (N 2 ) and the annealing temperature (900-1,100°C) on the micrographic structure, grain size and texture and, as a consequence, in the total core losses ((1.0 T) 10-1000 Hz) were studied. The analysis of the results shows that the core losses are, in all cases, lower than those of the highest grade of conventionally processed nonoriented magnetic steel sheets, this becoming specially noticeable in the frequency range between 50-400 Hz.
Highlights
In the present research, high silicon (6.4 %) - iron microcrystalline ribbons were obtained by rapid quenching
The analysis of the results shows that the core losses are, in all cases, lower than those of the highest grade of conventionally processed nonoriented magnetic steel sheets, this becoming specially noticeable in the frequency range between 50 - 400 Hz
Mater., 160, 1996: 151 -153. [27] Nippon Kokan Super E - Core catalogue, Kawasaki - ku, Kawasaki, 210 Japón
Summary
Actualmente, el proceso siderúrgico de fabricación de chapa magnética no orientada presenta Tras el tratamiento térmico final, un mínimo nivel de tensiones residuales junto a un tamaño de grano (150 - 200 ¡nm) que minimice la cifra de pérdidas totales [7] y una textura tal, que elimine, en la medida de lo posible, las direcciones de difícil imanación del plano de la chapa, preservando, al mismo tiempo, la isotropía plana [8], tendremos un material especialmente adecuado al destino que hemos señalado. A su vez, función de los parámetros del proceso previo de solidificación rápida (9 y 10) y muy especialmente del tratamiento térmico final a que se somete este material, ya que dicho tratamiento tiene una influencia decisiva en el estado de tensiones interno, tamaño de grano y textura desarrollada, a través del tipo de recristalización primaria o terciaria, como función del rango de temperaturas y tipo de atmósfera empleada [11,12,13].
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