摘要
无取向硅钢广泛应用于电工材料,具有硅含量高、铁损低、磁导率高,加工性能好等特性。无取向硅钢的磁性能与钢中第二相粒子密切相关。钢中微合金元素Mn、Al含量设计和稀土微合金化是控制钢中第二相的主要方法。结合热力学计算软件Thermo-Calc和FactSage,分析了1.5%Si钢和3.0%Si钢在平衡相变和凝固过程中组织的组成和析出相的演变规律;Mn、Al元素变化对相组织演变和第二相析出的演变影响;Y元素微合金化对第二相析出的演变影响,同时分析了铸态3.0%Si钢组织和稀土Y微合金化前后典型夹杂物变化,并对计算结果进行验证。结果表明:Si元素可以显著缩小中温奥氏体相区并影响MnS和AlN的析出行为;硅钢中Mn元素含量提高促进MnS析出,Al元素含量提高可以促进MnS提前析出并显著促进AlN提前析出;在高温液相中添加稀土Y存在Al_(2)O_(3)→Y_(2)O_(3)→Y_(2)O_(3)+Y_(2)S_(3)的转变,在固态相变阶段存在Al_(2)O_(3)+MnS+AlN→Y_(2)O_(3)+YS+YN的转变;实验中稀土Y的加入,会使硅钢中的主要夹杂物从MnS变为Y_(2)O_(2)S。因此通过向钢中添加微量Y元素可以有效实现钢中夹杂物和析出物的有效无害化控制。
Non-oriented silicon steel is widely used in electrical materials,which has high characteristics of high silicon content,low iron loss,high permeability and good processing performance.The magnetic properties of non-oriented silicon steel are closely related to the second-phase particles in the steel.The design of Mn,Al content of microalloying elements in steel and rare earth microalloying are the main methods to control the second phase in steel.Combined with the thermodynamic calculation software Thermo-Calc and FactSage,the composition of the microstructure and the evolution of the precipitated phase of 1.5%Si steel and 3.0%Si steel during the equilibrium phase transition and solidification process,the influence of Mn and Al elements on the evolution of phase microstructure and the evolution of the second phase precipitation,and the influence of Y element microalloying on the evolution of the second phase precipitation were analyzed.The results show that Si can significantly reduce the austenite phase region at medium temperature and affect the precipitation behavior of Mns and AIN,the increase of Mn content in silicon steel can promote the precipitation of MnS,and the increase of Al content can promote the early precipitation of MnS and significantly promote the early precipitation of AIN,the transformation of Al_(2)O_(3)→Y_(2)O_(3)→Y_(2)O_(3)+Y_(2)S_(3)in the addition of rare earth Y in the high-temperature liquid phase,and the presence of Al_(2)O_(3)+MnS+AIN→Y_(2)O_(3)+YS+YN in the solid-state phase transition stageThe addition of rare earth Y in the experiment will change the main inclusion in silicon steel from MnS to Y_(2)O_(2)S.Therefore,the effective harmless control of inclusions and precipitates in steel can be achieved by adding trace Y elements to the steel.
作者
张博文
李小勇
余慧
王旗
徐海强
史志鹏
冯捷
Zhang Bowen;Li Xiaoyong;Yu Hui;Wang Qi;Xu Haiqiang;Shi Zhipeng;Feng Jie(School of Materials Science and Engineering,Hebei University of Science and Technology,Shijiazhuang 050018,Hebei;Shanxi Jinnan Iron and Steel Group Co.,Ltd.,Linfen 043400,Shanxi;The First Steelmaking Division of Jingye Iron&Steel Co.,Ltd.,Shijiazhuang 050018,Hebei;Jingye Iron&Steel Co.,Ltd.,Shijiazhuang050018,Hebei)
出处
《河北冶金》
2023年第12期20-27,共8页
Hebei Metallurgy
基金
国家自然科学基金(52174311,51874116)。
关键词
无取向硅钢
相变
热力学计算
第二相
稀土
non-oriented silicon steel
phase transformation
thermodynamic calculations
second phase
rare earth
