关键词: IF钢, 加热温度, 屈服强度, 塑性应变比, 二相粒子, 织构分析

Abstract: The heating temperature was taken as an influencing factor on controlling the properties of Ti-Nb-IF steel during hot rolling. To study the relationship among the heating temperature, steel structure and properties, the microstructure, second-phase particles and texture of Ti-Nb-IF samples hot-rolled at 1140°C and 1214°C were analyzed separately. The results showed that the lower heating temperature (1140°C) is more beneficial to improving mechanical properties than rolled at 1214°C, i.e., the yield strength decreases by 30 MPa with plastic strain ratio increases by 0.16 at 1140°C. The main reasons are elucidated by experimental results as follows: When Ti-Nb-IF steel sheets are hot-rolled at 1140°C, bigger second-phase particles and finer ferrite grains are available to provide homogeneous appearance and strong γ recrystallization texture in such subsequent processes, as cold rolling and annealing.