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在实验室模拟薄板坯连铸连轧(TSCR)生产Fe-3%Si钢带,研究薄板坯连铸连轧不同工艺参数对Fe-3%Si钢带热轧和常化显微组织的影响.结果表明,TSCR工艺生产的Fe-3%Si钢带热轧显微组织沿板厚方向呈现组织不均匀性,1 200℃保温20 min,前两道压下量较大、道次递减的显微组织过渡层再结晶晶粒数较多且相对均匀细小,没有中心层拉长的条带组织,有利于二次再结晶的完善.显微组织平均晶粒尺寸与传统流程热轧平均晶粒尺寸相差1.5μm,具有几乎相同的位错形貌,头部和中部显微组织差别都很小.热轧显微组织质量决定了常化后显微组织的质量.
The Fe-3% Si steel strip was simulated by thin slab continuous casting and rolling (TSCR) in laboratory and the effect of different technological parameters on the hot rolling and normalizing microstructure of Fe-3% Si strip was studied. The results show that the hot rolled microstructure of Fe-3% Si steel strip produced by TSCR process shows the inhomogeneous microstructure along the thickness direction, and the microstructure is tempered at 200 ℃ for 20 min, The number of recrystallized grains in the microstructure transition layer is relatively large and relatively uniform and small, and there is no strip tissue elongated in the center layer, which is conducive to the improvement of secondary recrystallization.The average grain size of the microstructure is similar to that of the conventional hot rolling average grain The grain size difference of 1.5μm, with almost the same dislocation morphology, the difference between the head and the middle of the microstructure are very small.The quality of hot rolled microstructure determines the quality of the normalized microstructure.