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研究了硼对Ti-IF钢热镀锌板组织和力学性能的影响,并从硼对冷轧后再结晶过程影响的角度解释了硼对组织性能影响的原因。利用万能试验机、光学显微镜和透射电子显微镜对不同硼质量分数IF钢热镀锌板的力学性能、组织和析出物进行检测,采用X射线衍射仪对织构取向密度进行分析,采用电子背散射衍射技术(EBSD)对镀锌板晶界取向差分布进行分析,利用显微硬度计和金相显微镜研究了硼对IF钢再结晶过程的影响。结果表明,硼质量分数在0.000 5%以内,随着硼质量分数的提高,Ti-IF钢热镀锌板铁素体晶粒尺寸降低,屈服强度和抗拉强度提高,塑性应变比降低。硼对Ti-IF钢力学性能产生影响的原因为,硼固溶于铁素体中,抑制再结晶过程,提高再结晶温度,细化铁素体晶粒尺寸,使小角度晶界比例提高,{111}织构组分降低,从而使力学性能发生变化。
The effects of boron on the microstructure and mechanical properties of Ti-IF hot-dip galvanized steel sheets were investigated. The reasons for the influence of boron on the microstructure and properties were explained from the viewpoints of the influence of boron on the recrystallization after cold-rolling. The mechanical properties, microstructure and precipitates of IF steel with different boron content were tested by universal testing machine, optical microscope and transmission electron microscope. The texture orientation density was analyzed by X-ray diffractometer. The electron backscatter Diffraction technique (EBSD) was used to analyze the grain boundary orientation difference distribution of galvanized sheet. The effect of boron on the recrystallization of IF steel was studied by microhardness tester and optical microscope. The results show that with the increase of boron content, the ferrite grain size of Ti-IF hot-dip galvanized steel decreases, the yield strength and tensile strength increase, and the plastic strain ratio decreases. The reason that boron affects the mechanical properties of Ti-IF steel is that boron dissolves in the ferrite, inhibits the recrystallization process, raises the recrystallization temperature, fines the ferrite grain size, increases the proportion of small-angle grain boundaries, The {111} texture component is reduced, thereby changing the mechanical properties.