摘要
通过一次冷轧和二次冷轧法制备极薄无取向硅钢,研究轧制及退火过程中组织、织构的演变规律及其对力、磁性能的影响。结果表明:一次冷轧法的冷轧组织主要为纤维变形组织,最终的再结晶组织晶粒较小,低温退火织构继承冷轧板中{001}〈110〉和{223}〈110〉织构,高温退火时,织构发生偏转,最终以α*织构和γ织构为主,二次冷轧法冷轧组织中观察到明显的剪切带,最终退火组织晶粒尺寸较大,并且剪切带为Goss晶粒提供形核位点,有利于退火过程中形成Goss织构,且λ取向线上{001}〈110〉织构向{001}〈010〉(Cube)织构偏转,γ织构强度逐渐降低。随退火温度升高,铁损先快速降低后缓慢降低,磁感应强度先升高后趋于稳定。且相较于一次冷轧法,二次冷轧法制备的极薄无取向硅钢铁损更低、磁感应强度更高,这主要是由于二次冷轧法含有明显的剪切带,从而促进有利织构Goss和Cube的形成,并减少γ不利织构,且再结晶晶粒尺寸更大。随退火温度升高,一次冷轧和二次冷轧退火板的屈服强度先快速下降后趋于稳定,且一次冷轧法制备的极薄无取向硅钢的屈服强度高于二次冷轧。采用二次冷轧法在800℃退火时,可以实现极薄无取向硅钢力学性能和磁性能的最佳匹配,此时中高频铁损P10/400为12.34 W/kg,P10/1000为36.12 W/kg,B50为1.71 T,屈服强度为389 MPa。
Ultrathin-gauge non-oriented silicon steel sheets are produced by both one-stage and two-stage cold-rolling processes.The effects of rolling and annealing on the evolution of microstructure,texture,mechanical,and magnetic properties are investigated.It is found that the microstructure resulting from onestage cold-rolling primarily comprised fibrous deformation structures,resulting in refined grain size after final recrystallization.Notably,the{001}〈110〉and{223}〈110〉textures persisted in the low-temperature recrystallized state,which is inherited from cold-rolled sheets.Conversely,during high-temperature annealing,a notable texture transformation occurs,with the α* and γ textures emerging as the dominant features.The two-stage cold-rolling method promotes the formation of shear bands,leading to a larger grain size in the final annealed structure.These shear bands served as crucial nucleation sites for Goss grains,thereby facilitating the development of Goss texture during the annealing process.Furthermore,the{001}〈110〉texture aligned along the λ orientation line towards the{001}〈010〉texture,accompanied by a gradual decrease in the intensity of the γ texture.As the annealing temperature increases,the iron loss initially decreases rapidly and slowly,whereas the magnetic induction intensity initially rises before stabilizing.Compared with the one-stage cold-rolling method,the ultrathin-gauge non-oriented silicon steel prepared by the two-stage cold-rolling method has lower iron loss and higher magnetic induction intensity.This superior performance can be attributed to the formation of shear bands,which enhance the formation of favorable Goss and Cube textures,the suppression of detrimentalγtexture,and the attainment of a larger recrystallized grain size.With increasing the annealing temperature,the yield strength of both the one-stage and two-stage cold-rolling annealed sheets initially decreases dramatically before trending to be stabilized.The yield strength of ultra-thin non-oriented silicon steel produced by the onestage cold-rolling method is higher than that produced by two-stage cold-rolling.The optimal comprehensive properties(both mechanical and magnetic properties)are achieved through a two-stage coldrolling process followed by annealing at 800℃,which yields a mid/high frequency-iron loss P10/400 of 12.34 W/kg,P of 36.12 W/kg,a magnetic induction intensity B50 of 1.71 T and a yield strength of 389 MPa.
作者
邢玉冉
程朝阳
罗文
贾涓
刘静
XING Yuran;CHENG Zhaoyang;LUO Wen;JIA Juan;LIU Jing(The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China;Guangdong Provincial Key Laboratory of New Energy Materials Service Safety,Shenzhen University,Shenzhen 518060,Guangdong,China)
出处
《材料工程》
北大核心
2025年第3期178-191,共14页
Journal of Materials Engineering
基金
国家自然科学基金项目(52274393,52074200)
湖北省重点研发计划项目(2023BAB141)。
关键词
极薄无取向硅钢
二次冷轧
退火温度
铁损
磁感应强度
屈服强度
ultrathin-gauge non-oriented silicon steel
two-stage cold-rolling
annealing temperature
iron loss
magnetic induction intensity
yield strength
作者简介
通讯作者:程朝阳(1987-),女,副教授,博士,研究方向为高品质电工钢微观结构与性能调控,联系地址:湖北省武汉市青山区和平大道947号武汉科技大学材料学部钢铁楼515(430081),E-mail:chengzhaoyang@wust.edu.cn。
