不同成分体系罩退高强IF钢的组织与性能  

Microstructures and properties of high strength IF steels with different chemical compositions by batch annealing process

作　　者：刘景佳 王自荣[1] 张丽琴 李雷 LIU Jing-jia;WANG Zi-rong;ZHANG Li-qin;LI Lei(Hunan Valin Lianyuan Iron ＆ Steel Co.,Ltd,Loudi,417009,China)

机构地区：[1]湖南华菱涟源钢铁有限公司

出　　处：《轧钢》2018年第5期39-42,共4页Steel Rolling

摘　　要：研究了不同成分体系含P高强IF钢在罩式退火条件下的析出物、组织与性能差异。结果表明,微合金元素Nb和Ti是影响试验钢析出物、组织和性能的关键因素。添加Ti的Ti-HIF和Nb＋Ti-HIF两种成分体系的试验钢FeTiP析出物数量多,r值较差;添加Nb可以细化钢板组织,使钢板析出强化、细晶强化、固溶强化效果更显著,有利于提高抗拉强度;Nb-HIF成分体系试验钢性能最优,适合罩式退火工艺条件下生产。The precipitation,microstructure and property of high strength IF steels with phosphorus of various chemical compositions by batch annealing process were studied.The results indicate that the micro-alloy elements of Nb and Ti are the key factors influenced the precipitation,microstructure and property of tested steel,more precipitation of FeTiP occurred on the tested steels of Ti-HIF and Nb＋Ti-HIF chemistry with poor r value.The addition of Nb may refine the steel microstructure to significantly enhance the effectiveness of precipitation hardening,fine-grain strengthening and solution strengthening,in favoring of improving the tensile strength of steel.The optimal property with Nb-HIF chemistry can be achieved by batch annealing process.

关 键 词：高强IF钢 罩式退火 析出物 r值 

分 类 号：TG142.1[一般工业技术—材料科学与工程]