Effect of Annealing Treatment on Microstructure and Texture of Hot-rolled Non-oriented Silicon Steel at Single/Duplex Phase Zones

The annealing treatment after hot rolling of silicon steel has a significant effect on its microstructure and texture.The hot-rolled non-oriented silicon steel samples at single/duplex phase zones were prepared by controlling hot rolling conditions, and annealing treatment experiments (at 900, 1 200 ℃ for 15 min) were conducted on the samples. The effect of annealing treatment on microstructure and texture of hot-rolled silicon steel at single/duplex phase zones was studied. The results show that static recrystallization occurs in the dynamic recrystallization region of hot-rolled silicon steel samples after annealing, while no static recrystallization occurs in the region of hot-rolled deformation microstructure without dynamic recrystallization. Besides, no obvious phase transformation occurs in the samples under the annealing conditions in this article. Generally, the static recrystallization is unfavorable for the improvement of 100 texture. Additionally, the greater the shear deformation during the hot rolling process, the more favorable it is for the formation of 100 texture after annealing. The dynamic recrystallization in single-phase hot-rolled sample is formed by shear deformation, while the dynamic recrystallization in duplex-phase hot-rolled sample is mainly formed by ferrite and austenite phase transformation, resulting in significant differences in static recrystallization grain size and main texture components between single-phase and duplex-phase hot-rolled samples after annealing at different temperatures.