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研究了薄带连铸条件下Cr17铁素体不锈钢薄带坯的初始组织及织构,并重点对常规连铸坯和等轴晶薄带坯在轧制及退火过程中的织构演变进行了对比研究。研究结果表明:在薄带连铸条件下,通过调整熔池内钢水的过热度可以实现对薄带坯初始组织、织构的有效控制。在较低的过热度(20~40℃)条件下,可以获得具有全等轴晶组织和随机织构的薄带坯。与常规连铸坯相比,等轴晶薄带坯经冷轧退火后能够形成较均匀且规则的γ纤维再结晶织构,消除了向{334}<483>的偏转,α纤维织构基本消失,进而使r值大幅提高。因此,薄带连铸技术在改善铁素体不锈钢的成形性能方面具有显著优势。
The initial microstructure and texture of Cr17 ferritic stainless steel strip under continuous casting and strip casting were investigated. The textural changes of the conventional slab and equiaxed strip during rolling and annealing were studied Comparative Study. The results show that the initial microstructure and texture of the strip can be effectively controlled by adjusting the degree of superheating of molten steel in the molten pool under the conditions of strip casting. Under the conditions of low superheat (20 ~ 40 ℃), a thin strip with congruent axis and random texture can be obtained. Compared with the conventional billets, the equiaxed grain billets annealed by cold rolling can form a more uniform and regular γ-fiber recrystallization texture, eliminating the deflection to {334} <483>, the basic α fiber texture Disappears, and then r value increased significantly. As a result, strip casting has significant advantages in improving the formability of ferritic stainless steels.