Influência da recristalização na textura cristalográfica e nas perdas magnéticas por histerese de um aço elétrico GNO.

Abstract

Non-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 steels. Annealing promotes recrystallization in the microstructure of the material which is closely related with the crystallographic texture. The objective of this study is to evaluate the influence of recrystallization on the evolution of crystallographic texture and hysteresis magnetic losses by in non-oriented grain electrical steel, with 1.28%Si, rolled industrial plant. Material samples, deformed by cold rolling with reductions of 50% and 70%, in different states of recrystallization has been analysed on the microstructure, crystallographic texture and hysteresis losses magnetic. The results showed the beginning of primary recrystallization and the occurrence of secondary recrystallization. The crystallographic texture has changed by conditions of recrystallization (partial recrystallization, primary recrystallization, secondary recrystallization). The evaluation of hysteresis magnetic losses showed that the states of partial recrystallization and primary recrystallization promoted a reduction of these.