薄带连铸与常规生产流程条件下Cr17铁素体不锈钢的织构及成形性能

Texture and Formability of Cr17 Ferritic Stainless Steel by Thin Strip Casting and Conventional Process

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 cast strips produced by thin strip casting technique,the texture evolutions of conventional continuous cast slab and equi-axed cast strip during rolling and annealing were investigated.It is shown that the initial microstructure and texture of cast strips can be controlled by changing superheat in the melt pool.At low superheat between 20 and 40℃,cast strips with fully equi-axed crystals and random texture are formed.After cold rolling and annealing,in comparison with the conventional continuous cast slab,the equi-axed cast strip showed more homogenous and regular γ-fiber recrystallization texture by eliminating the shift to {334}483 and almost disappeared α-fiber texture,thus increasing r-value.Therefore,thin strip casting technique has advantage on improving the formability of ferrtic stainless steel.