冷轧无取向硅钢中夹杂物的微观结构表征及演变规律探讨  

Microstructure characterization and evolution law investigation of inclusions in cold-rolled non-oriented silicon steel

作　　者：吴园园 王晓东 金传伟 张继明 WU Yuanyuan;WANG Xiaodong;JIN Chuanwei;ZHANG Jiming(Institute of Research of Iron&Steel,Shagang,Jiangsu Province,Zhangjiagang 215625,China)

机构地区：[1]江苏省(沙钢)钢铁研究院,江苏张家港215625

出　　处：《冶金分析》2023年第4期34-40,共7页Metallurgical Analysis

摘　　要：高牌号无取向硅钢对磁性能有更高的追求,而夹杂物作为影响磁性能的主要因素之一,成为越来越多研发人员关注的对象。文中以WV1900为研究对象,利用双束系统、能谱仪及Dragonfly三维重构软件系统研究了硅钢中夹杂物的微观结构及随着退火温度升高的演变规律。结果表明:夹杂物主要类型有AlN、MnS、AlN-MnS、AlN-Al_(2)O_(3)、MnS-Al_(2)O_(3)以及AlN-MnS-Al_(2)O_(3),三维空间重构的形态显示AlN、MnS及AlN-MnS易以Al_(2)O_(3)为形核核心析出,AlN-MnS是MnS依附AlN形核析出。夹杂物随着退火温度的升高,总体呈现出先析出—长大—再析出—析出与固溶达到动态平衡的变化规律。为了提高成品的磁性能,推荐退火温度在990~1000℃,此时夹杂物总数低,且尺寸在(0,1]μm的夹杂物也达到低值,一定程度上减少对成品磁性能的影响。夹杂物的类型、空间形态以及析出规律研究结果可以为无取向硅钢退火工艺制定及磁性能改善提供技术支撑。High-grade non-oriented silicon steel has a higher pursuit in magnetic properties.The inclusion is one of the main factors affecting the magnetic properties,and has been paid much attention by more and more researchers.WV1900 was selected for the object of study.The microstructure of inclusions in silicon steel and its evolution law with the increase of annealing temperature were investigated by the means of dual-beam system,energy spectrometer and Dragonfly three-dimensional reconstruction software system.The results showed that the main types of inclusions were AlN,MnS,AlN-MnS,AlN-Al2O3,MnS-Al2O3 and AlN-MnS-Al2O3.The morphology of three-dimensional space showed that AlN,MnS and AlN-MnS were easily precipitated with Al2O3 as the nucleation core.Moreover,AlN-MnS was the nucleation precipitation of MnS attached on AlN.With the increase of annealing temperature,the inclusions showed a change rule of precipitation-growth-reprecipitation-dynamic equilibrium between precipitation and solid solution.In order to improve the magnetic properties of the finished product,the annealing temperature at 990-1000℃was recommended.In this temperature range,the total number of inclusions was low,and the inclusions with a size of(0,1]μm also reached a low value,which reduced the influence on the magnetic properties of the finished product to a certain extent.The research results of inclusion type,space morphology and precipitation law in the study could provide a technical support for the formulation of the annealing process and the improvement of the magnetic properties of the non-oriented silicon steel.

关 键 词：冷轧无取向硅钢 夹杂物 三维空间 磁性能 双束系统 

分 类 号：TF645[冶金工程—钢铁冶金] O657.62[理学—分析化学]