Abstract
Grain-oriented silicon steels were produced by the shortest processing route involving twin-roll strip casting, two-stage cold rolling with intermediate annealing, and simulated continuous annealing. The secondary recrystallization behavior of grain-oriented silicon steels under different inhibition conditions was in-situ observed by combining the confocal laser scanning microscopy (CLSM) and electron backscattered diffraction (EBSD) techniques. The results revealed that the optimal temperature of secondary recrystallization showed a proportional relationship with the Zenner pinning force. In the case of weak pinning force, the abnormal grain growth occurred quickly at ~1050 °C. The corresponding growth rates were in the range of 60–1400 μm/min and decreased gradually as the secondary recrystallization proceeded. In the case of strong pinning force, the incubation time and onset temperature of the secondary recrystallization was significantly increased, but the total time of the secondary recrystallization was obviously shortened from 685 s to 479 s, and the final magnetic induction of B8 was increased from 1.7 T to 1.85 T. After the secondary annealing, some island grains and coarse primary grains were retained. The formation of island grain was related to the low migration of grain boundaries. The findings of coarse γ- grains indicated that the primary grain size also played a crucial role during secondary recrystallization, apart from the primary recrystallized texture, which attracted more attention previously.
Highlights
Grain-oriented silicon steel is an important soft magnetic material, which is mainly used as the core material of transformers [1]
The secondary recrystallization was in-situ observed by combining the confocal laser scanning microscopy (CLSM) and electron backscattered diffraction (EBSD) techniques
The Microstructure, Texture, and Precipitates in Intermediate Annealed Sheets. Both the formation of Goss texture acting as the seeds of secondary recrystallization and the precipitation of MnS inhibitors occurred in hot rolled step
Summary
Grain-oriented silicon steel is an important soft magnetic material, which is mainly used as the core material of transformers [1]. Its excellent magnetic properties are attributed to the extremely strong Goss texture obtained by secondary recrystallization. From the melting states to finished products, the grain-oriented silicon steel undergoes a series of physical metallurgical processes such as continuous casting, slab reheating, hot rolling, normalization, cold rolling, decarburization annealing, nitriding, and secondary annealing, among others. A simplified processing route known as twin-roll strip casting was proposed to manufacture the grain-oriented silicon steel [8,9]. This novel process directly provides the thin as-cast strip from the liquid steels, which has similar thickness as the conventional hot-rolled sheet
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