无取向硅钢中硫化物的析出机理  

Precipitation Mechanism of Sulfide in Non-oriented Silicon Steel

作　　者：乔家龙 郭飞虎 付兵[2] 胡金文 项利[1] 仇圣桃[1] QIAO Jialong;GUO Feihu;FU Bing;HU Jinwen;XIANG Li;QIU Shengtao(National Engineering Research Center of Continuous Casting Technology,China Iron&Steel Research Institute Group,Beijing 100081,China;State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China;School of Metallurgy and Resources,Anhui University of Technology,Maanshan 243002,China)

机构地区：[1]钢铁研究总院连铸技术国家工程研究中心,北京100081 [2]武汉科技大学省部共建耐火材料与冶金国家重点实验室,武汉430081 [3]安徽工业大学冶金与资源学院,马鞍山243002

出　　处：《材料导报》2021年第20期20106-20112,共7页Materials Reports

基　　金：国家重点研发计划(2016YFB0300305)。

摘　　要：结合无取向硅钢中硫化物的析出热力学、动力学计算和扫描电镜(SEM)、透射电镜(TEM)检测,系统研究了硫化物在无取向硅钢中的析出机理,并讨论了硫化物对退火过程中晶粒长大的影响。结果表明,无取向硅钢中硫化物以(Mn,Cu)S复合析出相为主。在凝固过程中,MnS和Cu_(2)S均不具备析出热力学条件。MnS先于Cu_(2)S在晶界形核,随着温度的降低将以位错形核为主。在均热过程中,w(Si+Al)≥2.5%的无取向硅钢中的MnS和w(Si+Al)≤1.6%的无取向电工钢中的Cu_(2)S主要在晶界形核。同时,均热过程中MnS在晶界的析出量远大于Cu_(2)S,Cu_(2)S主要在后续的热处理过程中析出。MnS和Cu_(2)S的Ostwald熟化研究表明,w(Si+Al)≥2.5%无取向硅钢中的MnS和Cu_(2)S对晶粒长大的影响明显大于w(Si+Al)≤1.6%无取向电工钢。The precipitation mechanism of sulfide and the effect of sulfide on grain growth during annealing in non-oriented silicon steel were systematically studied based on the calculation of thermodynamics and kinetics,combined with scan electron microscopy(SEM)and transmission electron microscopy(TEM).The results indicate that sulfides in non-oriented silicon steel are mainly(Mn,Cu)S composite precipitates.In the solidification process,MnS and Cu_(2)S would not possess the precipitation thermodynamic conditions.MnS would preferentially nucleate at grain boundaries before Cu_(2)S,and dislocation nucleation will dominate as the temperature decreases.In the soaking process,MnS in w(Si+Al)≥2.5%non-oriented silicon steel and Cu_(2)S in w(Si+Al)≤1.6%non-oriented electrical steel are mainly nucleated at the grain boundary.Meanwhile,during the soaking process the precipitation amount of MnS is much larger than that of Cu_(2)S in the grain boundary,and Cu_(2)S would mainly precipitate in the subsequent heat treatment processes.Ostwald ripening calculations of MnS and Cu_(2)S show that the effect of MnS and Cu_(2)S in w(Si+Al)≥2.5%non-oriented silicon steel on grain growth is significantly greater than that of w(Si+Al)≤1.6%non-oriented electrical steel.

关 键 词：无取向硅钢 硫化物 析出机制 形核 

分 类 号：TF4[冶金工程—钢铁冶金]