钙处理对稀土在C-Mn钢中作用的影响  

Influence of Ca treatment on effect of rare earth in C-Mn steel

作　　者：谢毓敏 宋明明 薛正良[1,2] 朱航宇[1,2] 徐润生[1,2] 刘升[1,2] XIE Yu-min;SONG Ming-ming;XUE Zheng-liang;ZHU Hang-yu;XU Run-sheng;LIU Sheng(Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China;Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steel Making,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China)

机构地区：[1]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 [2]武汉科技大学钢铁冶金新工艺湖北省重点实验室,湖北武汉430081

出　　处：《钢铁》2020年第11期30-36,共7页Iron and Steel

基　　金：国家自然科学基金青年科学基金资助项目(51804229);湖北省自然科学基金青年基金资助项目(2018CFB306);大学生创新创业项目(201710488057)。

摘　　要：为了明确钙处理对稀土在C-Mn钢中作用的影响,利用扫描电镜、光学显微镜和超景深三维显微镜对热轧态试验钢夹杂物和显微组织进行了观测,结合热力学计算和冲击断口分析结果,对比研究了稀土和钙-稀土复合处理对C-Mn钢力学性能的影响规律。结果表明,稀土能将钢中典型夹杂物改性为近球形的含硅稀土氧化物的复合夹杂,尺寸细化,长宽比降低。钙-稀土处理后夹杂物变为球形含稀土和钙的复合夹杂,钢洁净度增高;添加钙能将稀土的收得率从7.6%提高到42.4%,有效提高稀土利用率,钙-稀土处理后珠光体所占面积百分比提高,钢的强度提高。证明采用钙处理提高稀土在C-Mn钢中的作用是可行的。To clarify the influence of Ca treatment on the effect of rare earth(RE)in C-Mn steel,scanning electron microscope,optical microscope,and ultra-depth three-dimensional microscope were used to observe the inclusion and microstructure for hot rolled test steels.Combining with thermodynamic calculation and impact fracture analysis,the influence of RE and Ca-RE complex treatment on the mechanical behavior of C-Mn steel was studied comparatively.The conclusions were as follows:after RE added into steel,the inclusion was changed into nearly spherical complex inclusions Si contained RE oxide,the size and aspect ratio of the inclusion decreased.For the steel treated by Ca-RE,almost all the inclusions became spherical complex inclusions of RE-Ca,and the cleanliness of steel increased.The Ca in steel increases the yield of RE from 7.6%to 42.4%improving the utilization rate of RE effectively.After the complex treatment of Ca-RE,the content of pearlite increased and so did in the strength of steel.All findings indicated that it is feasible to use Ca to improve the effect of RE in C-Mn steel.

关 键 词：钙处理 稀土 夹杂物 组织 性能 

分 类 号：TF703[冶金工程—钢铁冶金]