Effect of lanthanum on inclusions in non-oriented electrical steel slabs  

作　　者：Qiang Ren Zhi-yuan Hu Yun-xia Liu Wei-cheng Zhang Zi-qi Gao Li-feng Zhang 

机构地区：[1]School of Mechanical Engineering,Yanshan University,Qinhuangdao 066004,Hebei,China [2]School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China [3]Research and Development Department,Shougang Zhixin Qian'an Electromagnetic Material Co.,Ltd.,Qian'an 064400,Hebei,China [4]School of Mechanical and Materials Engineering,North China University of Technology,Beijing 100144,China

出　　处：《Journal of Iron and Steel Research International》2024年第7期1680-1691,共12页钢铁研究学报（英文版）

基　　金：support from the National Natural Science Foundation of China (Grant Nos.52104342 and U22A20171);Hebei Natural Science Foundation (Grant No.E2021203062);the High Steel Center (HSC)at Yanshan University,Hebei Innovation Center of the Development and Application of High Quality Steel Materials,Hebei International Research Center of Advanced and Intelligent Manufacturing of High Quality Steel Materials.

摘　　要：The effect of lanthanum on the characteristics of inclusions in the slab of non-oriented electrical steels was investigated through industrial trials and thermodynamic analysis.The number,size,and chemical composition of inclusions in the surface,one-quarter of thickness and the center of slabs with and without lanthanum addition were statistically analyzed using an automatic inclusion analysis system.In the lanthanum-free slab,inclusions were predominately MgO.Al_(2)O_(3),MgO,and AlN as well as a small number of Al_(2)O_(3)-MgO-CaO and MgS.The number densities of oxide inclusions and AlN decreased from the surface to the center of the slab,which was ascribed to the difference in cooling intensity during the continuous casting.In the steel with lanthanum addition,inclusions were modified into LaAlO_(3) and La_(2)O_(2)S and gradually transformed into dual-phase MgO-La_(2)S3 with an increasing distance from the slab surface due to the reaction between the lanthanum-containing inclusion and the steel matrix.The uneven distribution of oxide inclusions along the thickness of the slab was eliminated in the lanthanum-bearing slab because the dissolved oxygen was remarkably decreased by lanthanum.Lanthanum-bearing inclusions were more likely to agglomerate AlN by inducing the heterogeneous nucleation of AlN on their surface,while small-size MgO.Al_(2)O_(3) inclusions hardly showed a coarsening effect on the size of AlN.

关 键 词：Lanthanum-Inclusion Non-oriented electrical steel Aluminum nitride Heterogenous nucleation 

分 类 号：TG335.5[金属学及工艺—金属压力加工]