摘要
取向硅钢具有高磁感、低铁损的优异性能,被广泛应用于制作变压器的铁芯,其最大的特点是通过二次再结晶获得锋锐的Goss织构。在实际生产中,为降低板坯的再加热温度,将Nb添加到取向硅钢中。本工作研究了微量(0%~0.025 0%,质量分数,下同)铌(Nb)对取向硅钢常化板析出物、组织和织构的影响。研究结果表明:取向硅钢常化板(不含铌)中的析出物主要是MnS和MnS与AlN的复合析出物,Nb主要以Nb(C,N)形式析出,常化板(含铌)中主要有MnS、AlN和Nb(C,N)的复合析出物。由于Nb(C,N)具有较强的抑制效果,添加0.009 0%的Nb可以达到较好的组织细化效果;但继续添加Nb,组织变化不大。含Nb取向硅钢常化板的织构主要是{001}〈110〉织构和较弱的{110}〈001〉织构,Nb含量对常化板织构的影响不大。
Grain oriented silicon steels are widely used as the core materials for transformers due to the high magnetic permeability and low core loss, which are charactered by the sharp Goss texture obtained by secondary recrystallization annealing. In order to reduce the slab reheating temperature, niobium is added into grain oriented silicon steel. In this study, four normalized bands of grain-oriented silicon steels with different Nb content(0 wt%—0.025 0 wt%) were prepared, a detailed study of the precipitates, microstructure, and texture in normalized bands were carried out by various analysis methods. The results show that the precipitates in normalized bands(Nb-free steel) are MnS and composite precipitates of MnS and AlN. Nb is mainly precipitated in the form of Nb(C,N). And the main precipitates in normalized bands(Nb-bearing steel) are composite precipitates of MnS, AlN and Nb(C,N). Due to the strong inhibition effect of Nb(C,N), finer microstructure is obtained in steel with 0.009 0%. However, the effect of Nb addition on microstructure is not obvious when the content is higher than 0.009 0%. And the main textures in normalized bands are {001}〈110〉 and {110}〈001〉, the effect of Nb content on texture is not obvious.
作者
汪勇
李光强
刘玉龙
高洋
郭小龙
朱诚意
WANG Yong;LI Guangqiang;LIU Yulong;GAO Yang;GUO Xiaolong;ZHU Chengyi(State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China;Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education,Wuhan University of Science and Technology,Wuhan 430081,China;Baosteel Central Research Institute,Shanghai 200000,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2022年第7期201-206,共6页
Materials Reports
基金
国家自然科学基金(51674180)。
关键词
NB
取向硅钢
析出物
组织
织构
Nb
grain oriented silicon steel
precipitates
microstructure
texture
