利用光学显微镜、电子背散射衍射仪、拉伸试验机分析了硼元素对IF钢的组织、织构及力学性能的影响。利用在线应变测量系统及成形试验机分析了硼元素对IF钢成形性能的影响。结果表明:向IF钢中添加硼元素,可以显著细化IF钢组织的晶粒尺寸,降低{111}织构组分含量,并提高IF钢的屈服强度和抗拉强度,降低塑性应变比;有助于IF钢平面应变及等双向拉伸应变两种成形方式,提高制造以拉胀成形为主的复杂IF钢成形零件的冲压合格率。

The effects of boron element on the microstructure, texture and mechanical properties of IF steel were analyzed by using optical microscope, electron backscatter diffractometer and tensile testing machine. The effects of boron element on the formability of IF steel were analyzed by using online strain measurement system and forming testing machine. The results show that adding boron element to IF steel could significantly refine the grain size of IF steel structure, reduce the content of {111} texture components, increase the yield strength and tensile strength of IF steel, and reduce the plastic strain ratio. It was helpful for the two forming methods of IF steel plane strain and equal biaxial tensile strain, and improved the stamping qualification rate of IF steel in complex forming parts mainly based on stretch forming.