铁素体区轧制工艺对IF钢织构及深冲性能的影响

研究了不同铁素体区热轧压下量和终轧温度下一种Ti-IF钢的冷轧和退火后性能和织构的特点.结果表明,较低的铁素体轧制温度和较高的铁素体区压下量时,IF钢具有更高的深冲性能、相对较高的强度、延伸率以及织构强度.IF钢的冷轧织构类型为典型的部分〈110〉∥RD纤维和〈111〉∥ND纤维;再结晶退火后,〈110〉∥RD纤维织构强度明显降低,转变为〈111〉∥ND再结晶纤维织构,因此〈111〉∥ND织构强度大幅度增加.其中终轧温度为750℃,热轧压下率为80%的试样的〈111〉∥ND再结晶纤维织构的强度最高.

Effect of Ferritic Hot Rolling Schedule on Texture and Deep Drawability of Ti-IF Steel

The properties after annealing and texture of a Ti-IF steel were investigated after different hot rolling reductions in ferrite region at different finished rolling temperatures. The results showed that the IF steel has better deep drawability, higher mechanical and texture strength and elongation if the hot rolling temperature was low with big reduction in ferrite region. The texture of cold rolled IF steel is the typical conventional cold texture, i.e., partial <110>//RD fibers and global <111>//ND fibers. After annealing for recrystallization, the strength of <110>//RD fibers decreases greatly and then transform into <111>//ND recrystallized fibers. Therefore, the texture strength of <111>//ND increases greatly. It was proved that among all the cold rolled specimens, the one hot rolled finally at 750°C. with total reduction of 80% has the highest strength of <111>//ND recrystallized fibers.