王家南，方 琪，魏国敏，金自力，孙 伟
(内蒙古科技大学 材料与冶金学院，内蒙古 包头014010）
关键词：高铌钢；稀土；软化率；再结晶行为；晶粒尺寸
中图分类号：TG156.93
摘要：为了研究微合金高强钢再结晶行为，使用Gleeble-1500D热模拟试验机模拟低碳高铌钢三道次粗轧过程，测定了真应力-真应变曲线，并用应力补偿法计算软化率；采用电感耦合等离子体原子发射光谱仪(ICP)测定了不同稀土含量下Nb的固溶量；采用激光共聚焦显微镜观察了低碳高铌钢的奥氏体原始组织，分析了稀土对低碳高铌钢再结晶的影响。结果表明：加入11ppm稀土镧就能使一三道次再结晶软化率降低约50%，并且能提高低碳高铌钢原始奥氏体晶粒的均匀性，使钢中Nb固溶百分比提高了16%。
Effect of rare earth on therecrystallization of high Nb steel roughing process
WANG jia-nan，FANGqi，WEI guo-min，JIN zi-li，SUNwei
(School of Materials andMetallurgy，Inner Mongolia University ofScience and
Technology，Baotou Inner Mongolia 014010，China)
Key words:High Nb steel; rare earth; softening rate;recrystallization behavior; grain size
Abstract.：In order to study the recrystallizationbehavior of micro alloyed high strength steel, the Gleeble-1500D thermalsimulation testing machine was used to simulate three pass rolling process ofhigh Nb steel, and the true stress-strain curves were determined. The stresscompensation method was used to calculate the softening rate. The dissolution ofNb at different rare earth content was determined using inductively coupledplasma atomic emission spectrometry (ICP). The microstructure of austenite inlow carbon high Nb steel was observed by using the laser scanning confocalmicroscope, and the effect of rare earth on the austenitizing behavior of lowcarbon high Nb steel was analyzed . The results show that the addition of 11 x10 -6RE in mass fraction can reduce the recrystallization softening rate of 13times by about 50%, and improve the uniformity of the original austenite grainof low carbon high Nb steel, which makes the percentage of Nb solid solution increasedby 16%