Role of Annealing Time in Thin-Gauge Non-oriented Silicon Steels Processed by Strip Casting
Cold-rolled Fe–2.6%Si sheets of 0.20 thickness prepared by strip casting and two-stage cold rolling were annealed for different time. The microstructure and texture of all samples were investigated by optical microscopy, electron backscattered diffraction and X-ray diffraction to illustrate the effect of annealing time on the development of texture and magnetic properties. The sample in the initial stage of complete recrystallization was characterized by strong η, γ and α component. Goss grains possessed size advantage, and γ grains showed the highest number density. Subsequently, γ-fiber and α-fiber was gradually weakened, whereas η-fiber always predominated the texture. However, with further increase in annealing time, γ-fiber was significantly enhanced and being a dominant component as a result of growth selection of γ grains. Ultimately, the magnetic induction gradually decreased after an increase over time, whereas the core loss displayed a continuous decrease. Texture development with annealing time in the present study could be explained by orientated nucleation mechanism and orientation pinning effect.
KeywordsThin-gauge non-oriented silicon steels Annealing time Texture Magnetic properties
The authors acknowledge support by the National Natural Science Foundation of China (Nos. 51674080, 51404155 and U1260204), the Program for New Century Excellent Talents in University (NCET-13-0111) and the Program for Liaoning Excellent Talents in University (LR2014007).
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