铁素体区热轧IF钢冷轧退火时织构的形成与演变

通过金相观察和织构ODF分析,系统地研究了铁素体区热轧IF钢织构的形成机制及其在冷轧和退火过程中织构转变的特点和机理.结果表明:铁素体区热轧IF钢时,在交滑移机制的作用下,主要得到纤维状的形变组织和较强的α丝织构和较弱的γ丝织构,同时有少量的再结晶晶粒存在;冷轧过程中,在位错滑移、晶粒转动以及晶内剪切带的共同作用下,形成典型的纤维状组织,α丝织构和γ丝织构都明显得到加强;退火时,再结晶组织和织构的形成主要受很强的定向形核机制和弱的选择长大机制控制.

Texture Formation of IF Steel Sheet Hot-Rolled in Ferrite Region and Its Transformation During Cold-Rolling and Annealing

Systematically investigated and discussed texture formation mechanism of IF steel sheet hot-rolled in ferrite region and its transformation mechanism during cold-rolling/annealing by means of the microstructure observation and crystallographic orientation distribution function (ODF). The results showed that the strong α-fibrous texture and the weak γ-fibrous texture are both attained simultaneously during hot-rolling in ferrite region by alternating slip system with a bit of recrystallized grains found; both the fibrous textures are strengthened during cold-rolling under the joint action of dislocation movement by slip, grain rotation and intracrystalline shear bands; the formation of recrystallization structure/texture is mainly controlled by the mechanism of strong oriented nucleation and weak selective growth during annealing.