高温渗氮Hi-B钢二次再结晶中组织及织构演变  

Microstructure and texture evolution of high temperature nitriding Hi-B steel during secondary recrystallization

作　　者：苏承群 赵刚[1,2] 肖欢[1,2] 黄芳玉 SU Cheng-qun;ZHAO Gang;XIAO Huan;HUANG Fang-yu(School of Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China;Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China)

机构地区：[1]武汉科技大学材料与冶金学院,湖北武汉430081 [2]武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室,湖北武汉430081

出　　处：《钢铁研究学报》2018年第6期461-468,共8页Journal of Iron and Steel Research

基　　金：国家自然科学基金资助项目(51274155)

摘　　要：模拟CSP工艺试制Hi-B钢在二次再结晶过程中不同退火温度下的组织和织构。使用Zeiss Axioplan金相显微镜（OM）观察试样组织,借助于NOVA400Nano SEM型场发射扫描电子显微镜进行微观织构EBSD检测分析。结果表明：Goss晶粒在1 040℃发生异常长大,异常长大之前晶粒细小均匀,有利的{111}〈112〉和{411}〈148〉织构为主要织构,异常长大后部分晶粒发生快速长大,组织则以Goss织构为主。Goss织构及{111}〈112〉和{411}〈148〉织构的取向差分布主要集中在20°-45°之间,高能晶界理论（HE）能够解释Goss晶粒的异常长大。基体的CSL晶界比例较低,且移动性差的∑3晶界比例较高,移动性好的∑5、∑7、∑9晶界比例较低,CSL晶界理论对于Goss晶粒的异常长大则不具有说服力。Effects of different annealing temperatures on the microstructure and texture during the secondary recrystallization of Hi-B steel manufactured by simulating CSP process were studied by Zeiss Axioplan optical microscope（OM）,NOVA400 Nano field emission scanning electron microscope（SEM）and electron back-scattered diffraction（EBSD）.The results show that Goss grains grow abnormally at 1 040℃,and the grains are fine and uniform before abnormal growth.The{111}〈112〉and{411}〈148〉textures are the main textures.A small number of grains grow rapidly after abnormal growth,and the Goss texture is the main texture.The distributions of misorientation angle of Goss,{111}〈112〉and{411}〈148〉orientation are mainly between 20°-45°,the high energy boundary theory（HE）can explain the abnormal growth of the Goss grain.The CSL grain boundary ratio of the matrix is relatively low,the proportion of the∑3 grain boundaries with poor mobility is high,the proportion of the∑5,∑7,∑9 grain boundaries is low,and CSL grain boundary theory is not persuasive for abnormal growth of Goss grains.

关 键 词：Hi-B钢 二次再结晶 织构 取向差 CSL晶界 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TG156.82[金属学及工艺—金属材料]