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对2种冷轧超低碳钢(Nb+Ti-IF钢和高Nb-IF钢)进行了再结晶退火实验,对比研究了2种钢在超快速退火(加热速率约为300℃/s)下的再结晶组织和织构特征.结果表明,在超快速退火工艺下,含C和Nb量较高的Nb-IF钢再结晶平均晶粒尺寸与普通退火工艺下无明显差别(均为(11.0±0.3)μm),再结晶织构峰值{223}<472>的取向密度由普通退火工艺下的23.9降低到18.0,且织构类型分散.分析表明,较高的C和Nb含量在超快速退火工艺下推迟再结晶的发生,提高再结晶温度,增加了其非γ取向形核所占比率,恶化<111>∥ND取向织构,是其织构强度减弱的原因.在超快速退火工艺下,再结晶平均晶粒尺寸是否细化是高形核密度、极短的长大时间的晶粒细化效应与高晶界迁移速率的晶粒粗化效应相互竞争的结果,极大变形量和细晶作用产生的高形核密度造成形核点饱和,降低了超快速退火相对于普通退火工艺的晶粒细化效应,是晶粒细化不明显的主要因素.
The recrystallization annealing experiments of two kinds of cold-rolled ultra-low carbon steel (Nb + Ti-IF steel and high Nb-IF steel) were carried out. The effects of ultra-rapid annealing (heating rate about 300 ℃ / s) The results show that the average recrystallization grain size of Nb-IF steel with high content of C and Nb is not significantly different from that of normal annealing under the ultra-rapid annealing process 11.0 ± 0.3) μm), and the orientation density of {223} <472> in the recrystallization texture was reduced from 23.9 to 18.0 in the conventional annealing process, and the texture types were dispersed.The analysis showed that the higher C and Nb contents were Rapid annealing process retarded the occurrence of recrystallization, increasing the recrystallization temperature, increasing the proportion of non-γ-oriented nucleation and deteriorating <111> ∥ND orientation texture, which is the cause of weakened texture strength in ultra-rapid annealing Process, the recrystallization average grain size is thinning is a high nuclear density, very short growth time of the grain refinement effect and the high grain boundary migration rate of the coarsening effect of grain as a result of great competition, great deformation The high nucleation density due to the amount and fine grain effect causes the nucleation sites to saturate, reducing the effect of the ultra-rapid annealing over the normal annealing process Grain refinement effect, grain refinement is not obvious the main factor.