初始组织及冷轧压下量对工业低牌号电工钢相变织构及磁性能的影响  

Influence of Initial Microstructure and Cold Rolling Reduction on Transformation Texture and Magnetic Properties of Industrial Low-Grade Electrical Steel

作　　者：杨平[1] 马丹丹 顾晨 顾新福 YANG Ping;MA Dandan;GU Chen;GU Xinfu(School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《金属学报》2024年第3期377-387,共11页Acta Metallurgica Sinica

基　　金：国家自然科学基金项目No.51931002。

摘　　要：有相变的低牌号电工钢连铸坯中普遍存在的{100}柱状晶显示了连铸过程中强烈的相变滞后及相变被抑制的特性。这时,热轧加热温度的变化会造成热轧组织与织构的多样性,并对后续冷轧退火组织与织构产生影响。本工作在前期初步考察热轧工艺对工业低牌号电工钢相变织构影响的基础上,结合连铸坯中柱状晶相变滞后现象,提出了亚稳态铁素体热轧保留{100}织构从而提高磁性能的思路,进一步考察了冷轧前不同初始组织及冷轧压下量对相变织构的影响,并探索了织构遗传的规律。结果表明,低温加热热轧的热轧板中存在较多{100}取向的形变晶粒,冷轧及相变退火后显示了明显的{100}织构遗传规律,有效改善了磁性能。压下量的提高削弱了{100}相变织构。分析认为,虽然工业低牌号电工钢中的Al、P元素阻碍了表面效应诱发的{100}相变织构,但低温热轧产生有利的初始{100}织构促进了最终遗传型相变织构。此外,高退火温度下得到的相变织构仍优于低退火温度下得到的再结晶织构。Compared with high-grade electrical steel,low-grade electrical steel has the advantages of low cost and high production quantity but low profits.Therefore,researchers often focus on studying high-grade electrical steel without phase transformation.The microstructure evolution of low-grade electrical steel is more complicated compared to high-grade steel due to the three transformation stages—casting,hot rolling,and final annealing—that are present between austenite and ferrite during their processing.During continuous casting,the<100>columnar grains commonly formed in the low-grade electrical steel cast slabs with phase transformation illustrate the characteristics of the pronounced transformation delay and suppression.In such conditions,the change in hot rolling temperature will cause diversity in hot-rolled microstructures and textures and affect the subsequent cold rolling and annealing microstructure and texture.Based on the previous studies on the effect of hot rolling processes on the transformation texture of industrial low-grade electrical steel and the observation of the transformation delay and suppression of columnar grains in cast slabs,this work further investigates the influence of the initial microstructures before cold rolling and cold rolling reduction on the transformation texture and explores the law of texture inheritance.In particular,the idea of retaining{100}texture using metastable ferrite hot rolling is proposed to improve magnetic properties.The results show that there are more{100}deformed grains in the hot-rolled plate heated at low temperature,and the{100}texture inheritance is obvious after cold rolling and transformation annealing,which effectively improves the magnetic properties.The{100}transformation texture is weakened with the increase in rolling reduction because the initial{100}grains gradually disappear with increasing rolling reduction.An analysis shows that although the{100}transformation texture induced by the surface effect is hindered by the alloying Al and P elemen

关 键 词：低牌号电工钢 相变 柱状晶 织构 磁性 轧制 

分 类 号：TG111.5[金属学及工艺—物理冶金]