循环应力对高强度无取向电工钢磁性能的影响  

Effect of cyclic stress on magnetic properties of high strength non-orientated electrical steel

作　　者：李兆振 宋新莉[1,2] 刘静 程朝阳[1,2] 贾涓 范丽霞[1,2] LI Zhaozhen;SONG Xinli;LIU Jing;CHENG Zhaoyang;JIA Juan;FAN Lixia(The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan430081,Hubei,China;Hubei Engineering Technology Research Centre of Marine Materials and Service Safety,Wuhan 430081,Hubei,China)

机构地区：[1]武汉科技大学省部共建耐火材料与冶金国家重点实验室,湖北武汉430081 [2]湖北省海洋工程材料及服役安全工程技术研究中心,湖北武汉430081

出　　处：《金属功能材料》2021年第6期62-65,74,共5页Metallic Functional Materials

基　　金：湖北省重点研发计划项目(2020BAA027);国家自然科学基金项目(52074200)。

摘　　要：研究了不同循环应力(370 MPa,400 MPa)对高强度无取向电工钢磁性能与微观结构影响。结果表明:试验钢在应力作用下循环加载到5×10^(3)周次时,磁感应强度明显降低,铁损增大,随循环周期延长,磁感应强度与铁损变化均趋于平缓。循环应力为400 MPa时磁感应强度下降与铁损增大更显著。随循环周期延长,磁畴结构由180°平行畴变成弯曲畴与迷宫畴,位错密度增大,这些因素是导致无取向电工钢磁感应强度降低,铁损增大的原因。The magnetic properties and microstructure of the experimental steel after cyclic at the stress of 370 MPa and 400 MPa were investigated.The results show that the magnetic induction intensity decreases significantly and the iron loss increases with the increasing of the cycles of 5×10^(3) under different cyclic stresses.The magnetic induction intensity and iron loss are not changing largely with the increasing cycle period.The magnetic induction intensity decreases and iron loss increases significantly with increasing the cyclic stress.With the increasing of cyclic times,the magnetic domain structure changes from 180°parallel domain to curved domain and labyrinth domain,and the dislocation density increases which leads to the magnetic induction intensity decreases and the iron loss increases.

关 键 词：循环应力 磁性能 磁畴 位错密度 

分 类 号：U465.1[一般工业技术—材料科学与工程] TG142.1[机械工程—车辆工程]