铌对低温取向硅钢初次再结晶行为的影响  

Effect of Nb on primary recrystallization behavior of low temperature grain-oriented silicon steel

作　　者：王黎光 王书桓 段阳会 李杰 冯运莉 WANG Li-guang;WANG Shu-huan;DUAN Yang-hui;LI Jie;FENG Yun-li(College of Metallurgy and Energy,North China University of Science and Technology,Tangshan 063210,Hebei,China)

机构地区：[1]华北理工大学冶金与能源学院,河北唐山063210

出　　处：《钢铁》2022年第1期119-125,共7页Iron and Steel

基　　金：国家自然科学基金资助项目(51974134);河北省科技重大专项资助项目(21281008Z);河北省研究生创新资助项目(CXZZBS2019139)。

摘　　要：以含铌取向硅钢铸坯低温加热制备高磁感取向硅钢为研究目标,通过研究铌对低温取向硅钢初次再结晶行为的影响,达到获得有利于二次再结晶发展的初次再结晶组织目的,采用OM和EBSD技术主要对比了0.055%铌和不含铌对低温取向硅钢中间退火板的初次再结晶组织、织构和晶界特征的影响。结果表明,铌的加入,使硅钢基体中形成了细小弥散的Nb(C,N),使抑制剂对初次再结晶晶粒长大的抑制作用增强,致使含铌试样初次再结晶组织更加细小均匀,板面方向平均晶粒尺寸为11.53μm,而不含铌试样为12.95μm;含铌试样板厚方向平均晶粒尺寸为12.46μm,而不含铌试样为13.78μm。含铌和不含铌试样经中间退火后沿板面方向不同厚度上,两种试样表层的织构均相对较弱,但含铌试样比不含铌试样γ线织构更锋锐;次表层两种试样γ线织构和Goss织构均得到加强,且含铌试样γ线织构相对更强,含铌试样中{111}<112>、{411}<148>等有益织构含量相对较多。中间退火后初次再结晶试样中主要晶界类型均为高能晶界和大角度晶界,含铌试样中高能晶界多于不含铌试样。含铌和不含铌试样晶界主要分布在Σ3~Σ11晶界之间,铌的加入可以增加Σ9晶界含量。由于高能晶界和Σ9晶界含量均多于不含铌试样,经高温退火后含铌试样发展二次再结晶组织比不含铌试样更完善,且含铌试样最终成品磁性能更好,磁感应强度B;达到1.89 T,铁损P;为1.37 W/kg。In order to obtain the primary recrystallization structure conducive to the development of secondary recrystallization, the effect of Nb on the primary recrystallization behavior of low temperature grain-oriented silicon steel was studied, the effects of 0.055% Nb and Nb-free samples on the primary recrystallization structure, texture and grain boundary characteristics of intermediate annealed plate of low temperature grain-oriented silicon steel were studied by OM and EBSD techniques. The results show that the addition of Nb forms fine dispersed Nb(C,N) in the silicon steel matrix, enhances the inhibition of the inhibitor on the growth of primary recrystallized grains, makes the primary recrystallized microstructure of Nb-containing samples more fine and uniform, the average grain size in the surface direction is 11.53 μm, while the Nb-free sample is 12.95 μm. The average grain size in the thickness direction of the Nb-containing sample is 12.46 μm, while the Nb-free sample is 13.78 μm. After intermediate annealing, the surface texture of the Nb-containing sample and the Nb-free sample is relatively weak, but Nb-containing sample have more sharp γ-fiber texture. Two samples of subsurface layer γ-fiber texture and Goss texture are strengthened, and the Nb-containing sample γ-fiber texture is relatively stronger. The beneficial texture content of {111}<112>,{411}<148> is relatively high in the Nb-containing sample.The main grain boundaries in the primary recrystallized samples after intermediate annealing are high-energy grain boundaries and large angle grain boundaries. The high energy grain boundaries in the Nb-containing sample are more than Nb-free sample. The grain boundaries of Nb-containing and Nb-free samples are mainly distributed in Σ3-Σ11 Between grain boundaries, the addition of Nb can increase Σ9 grain boundary content. After the high temperature annealing, the secondary recrystallized microstructure of the Nb-containing sample is more complete than the Nb-free sample, and the final product

关 键 词：取向硅钢 铌 初次再结晶 组织 织构 

分 类 号：TG142.1[一般工业技术—材料科学与工程]