为了观察高强IF钢退火处理后的显微组织和再结晶织构的变化规律,采用两种不同退火工艺对高强IF钢进行热处理.结果表明,IF钢在两种退火方式下均形成了γ-{111}纤维织构,快速升温(350℃/min)退火时,再结晶新核呈等轴状,由变形带内的亚晶合并形成,与冷轧变形基体保持相同取向.慢速升温(2℃/min)退火时,新核在晶界弓出形成,且沿轧制方向呈饼形分布,与基体没有明显取向关系.慢速升温退火样品的γ-{111}取向密度强于快速升温的.对进一步改善薄板钢深冲性能具有指导作用.
A cold-rolled high strength IF steel was annealed at two different heating rate to study the evolution of microstructure and recrystallization texture of IF steels.The results show that the γ-tier ({ 111 } or (ND || <111>)) of IF steel form at both of two recrystallization annealing processes.When the samples are heated at fast rate of 350 ℃/min,the recrystallization grains grow from the merging of subgrains and show equiaxed morphology.The orientation of recrystallization grains was consistent with the surrounding deformation matrix.When the samples are heated at slow rate of 2 ℃/rain,the new grains grow from grain boundary bowing,showing pancake grains along the rolling direction with weak orientation to the deformed grains.The density of γ-{ 111 } orientation of the samples with slow heating rate are stronger than that with fast heating rate.The results are of great significance to improve the deep drawability of the thin sheet.
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