关键词: 热轧, 铁素体不锈钢, 显微组织, 织构, 深冲性

Abstract: Continuous-casting slabs with pure columnar grains of 409L ferritic stainless steel were hot rolled at different finishing temperatures (FT), i. e. the conventional hot rolling was transformed into warm rolling, then the same subsequent process was conducted. The results showed that the finished sheet rolled at lower FT has greater rm value and smaller Δr value. The decreased FT causes some variations in microstructural evolution as follows. In either hot or cold rolled sheets, the grain boundaries and in-grain shear bands increase to refine and harden the deformed microstructure, especially the coarse banded grains around mid-thickness layer. Then the nucleation sites due to recrystallization during annealing increase so as to refine and homogenize the annealed microstructure. Meanwhile, the textural evolution thus varies, such as the texture after hot rolling and annealing moves from {001~114}<110> to the regions with greater φ1 and Φ angles; the texture peak after cold rolling shifts from {001}<110> to {335}<110>; the γ-fiber texture after cold rolling and annealing increases and the peak shifts from {334}<483> to {111}<112>, while the {001~114}<110> and (0°<Φ<35°, φ1&asyum;25°) textures decrease.