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对含Nb细晶高强IF薄钢板进行了850℃下不同保温时间的退火试验。采用拉伸试验、电子背散射衍射技术(EBSD)等手段,研究了不同罩式退火时间对细晶高强IF钢板再结晶织构和晶界特征分布的影响。结果表明,随着退火时间的延长,重位点阵晶界的出现频率先增加后减少,在40 min时达到峰值,其与晶粒度及均匀性有关,影响再结晶织构强度。退火试验IF钢板1/2层上γ纤维织构的强度明显高于其1/4层,对应的退火试样1/2层上α纤维织构的强度略低于其1/4层。当退火温度为850℃,保温40 min时,试验IF钢板具有最强的γ纤维织构,最高的n、r值和较好的晶界特征分布。
Annealing tests were carried out on Nb thin grain high strength IF steel sheets with different holding time at 850 ℃. Tensile test and electron backscatter diffraction (EBSD) were used to study the effect of annealing time on recrystallization texture and grain boundary distribution of fine-grained IF steel. The results show that as the annealing time prolongs, the occurrence frequency of the repositioned lattice increases first and then decreases, reaching the peak value at 40 min, which is related to grain size and uniformity and affects the recrystallization texture strength. The strength of γ fiber texture on the 1/2 layer of IF steel sheet is obviously higher than that of the ¼ layer in the annealing test. The α fiber texture on the 1/2 layer of the corresponding annealed sample is slightly lower than the 1/4 layer. When the annealing temperature is 850 ℃ and holding time is 40 min, the test IF steel sheet has the strongest γ fiber texture, the highest n, r value and the better grain boundary distribution.