退火过程中无取向电工钢的晶粒长大行为及磁性能演变

对Fe-3%Si无取向电工钢冷轧板进行不同时间的退火处理,利用光学显微镜、EBSD等研究了退火过程的晶粒长大行为及其对磁性能的影响。结果表明,随着退火时间的增加,退火板中Goss以及γ织构晶粒占比降低,{114}<841>以及{001}<120>织构晶粒占比增大。在退火时间低于20 s时,退火织构以强γ和Goss织构为主。退火时间为60 s时,{001}<120>织构晶粒长大速率急剧增大,平均晶粒尺寸达到约105 μm。退火时间达到240 s时,退火织构以强{001}<120>以及{114}<841>织构为主。退火时间为30～60 s时轧向及横向磁感值迅速增大,60 s时轧向磁感达到最大值1.74 T,120 s时横向磁感达到最大值1.67 T,之后随着退火时间增加而轻微降低,并分别稳定在1.72 T和1.66 T左右。退火板45°方向磁感值先升高后降低,20 s时达到最大值1.67 T。各方向的铁损值均随退火时间的增加而降低,且磁各向异性逐渐减小。

Grain growth behavior and magnetic property evolution of non-oriented electrical steel during annealing

Cold rolled Fe-3%Si non-oriented electrical steel sheet was annealed for different time. The grain growth behavior and magnetic properties evolution of the non-oriented electrical steel during annealing were investigated by optical microscope, EBSD and so on. The results indicate that the proportion of Goss and γ texture grains decreases with the increase of annealing time, while the proportion of {114}<841> and {001}<120> texture grains increases gradually. When the annealing time is lower than 20 s, the recrystallization texture is characterized by strong γ and Goss textures. When annealed for 60 s, the growth rate of {001}<120> texture grains increases sharply, and the average grain size reaches about 105 μm. When the annealing time is 240 s, the annealing texture is mainly strong {001}<120> and {114}<841> textures. The magnetic induction intensity along RD and TD rises rapidly during annealing for 30-60 s, and the value along RD reaches the maximum of 1.74 T at 60 s, and value along TD reaches the maximum of 1.67 T at 120 s. After that, the magnetic induction intensity decreases slightly with the increase of annealing time and stabilizes at about 1.72 T (RD) and 1.66 T (TD), respectively. The magnetic induction intensity along the 45° direction increases first and then decreases, reaching the maximum value of 1.67 T at 20 s. The iron loss along each direction decreases with the increase of annealing time, and the magnetic anisotropy also decreases gradually.