薄带连铸3.4%Si无取向硅钢的组织、织构演变及性能  

Microstructure and texture evolution,properties of 3.4%Si non-oriented silicon steel strip produced by twin-roll strip casting

作　　者：王志磊[1] 车尚峰 侯迪文 方烽 张元祥[1] 王洋[1] 张晓明[1] Wang Zhilei;Che Shangfeng;Hou Diwen;Fang Feng;Zhang Yuanxiang;Wang Yang;Zhang Xiaoming(The State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang Liaoning 110004,China)

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110004

出　　处：《金属热处理》2021年第10期18-25,共8页Heat Treatment of Metals

基　　金：中央高校基本科研业务专项资金(N2007003);辽宁省自然科学基金博士科研启动基金(2020-BS-047)。

摘　　要：基于薄带连铸技术,采用单阶段冷轧和两阶段冷轧工艺分别制备了0.35 mm和0.20 mm高牌号无取向硅钢,利用EBSD、XRD等检测手段分析了无取向硅钢制备全流程的组织和织构演变。研究表明,薄带连铸制备的铸带以粗大柱状晶为主,且具有较强λ纤维织构,取向密度达到4.76,无γ织构。正火处理后部分等轴晶粒长大,织构类型没有明显变化。单阶段冷轧板以α织构为主,经退火后再结晶织构以均匀λ织构和γ织构为主,强点为{001}<120>,取向密度为5.41。两阶段冷轧板以λ织构和γ织构为主,剪切变形明显。再结晶退火后组织相对粗大,且形成了较强的Cube织构,取向密度为6.45。得益于初始有利织构的遗传,试验钢具有高磁感、较高强度优势,且铁损值达到常规流程相当水平。0.35 mm退火板B_(50)达到1.77 T,P_(1.0/400)为20.78 W/kg。0.20 mm退火板B_(50)为1.70 T,P_(1.0/400)达到13.74 W/kg,高频铁损优势明显。两种规格无取向硅钢屈服强度均超过415 MPa,伸长率超过15%。Based on twin-roll strip casting(TSC)technology,0.35 mm and 0.20 mm high-grade non-oriented silicon steel strips were prepared by single-stage cold rolling and two-stage cold rolling,respectively.Microstructure and texture evolution of non-oriented silicon steel along preparation process were analyzed by means of EBSD,XRD and other detection methods.The results show that the as-cast strip prepared by TSC is mainly composed of coarse columnar crystals and has a strongλ-fiber texture with intensity of 4.76 and withoutγ-texture.After normalization,some equiaxed grains grow up,and the texture types does not change significantly.The texture of one-stage cold-rolled sheet mainly consisted ofα-texture,and the recrystallization texture are mainly consisted of uniformγ-texture andλ-texture concentrated on{001}<120>with intensity of 5.41.The two-stage cold-rolled sheet is mainly composed ofλ-texture andγ-texture with high density of shear bands.After recrystallization annealing,the microstructure is relatively coarse,and strong Cube texture is formed with intensity of 6.45.Due to the inheritance of initial favorable texture,the tested steel exhibites high magnetic induction and relatively high strength,and the iron loss value reaches the level of the conventional process.The B_(50) reaches 1.77 T and P_(1.0/400) is 20.78 W/kg in 0.35 mm annealed sheet.And the B_(50) is 1.70 T,P_(1.0/400) is 13.74 W/kg,which shows obvious advantage of low iron loss under high-frequency in 0.20 mm annealed sheet.The yield strength and the elongation of the two types of non-oriented silicon steel exceed 415 MPa and 15%,respectively.

关 键 词：无取向硅钢 薄带连铸 磁性能 织构 

分 类 号：TG142.7[一般工业技术—材料科学与工程]