Effect of Ce-La alloying treatment on characteristics of inclusions in grain-oriented silicon steels
XIE Xiao-hui1,2, LIU Yu-long1,2, LI Guang-qiang1,2, CHEN Xin-yuan3, ZHU Cheng-yi1,2
1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China; 2. Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China; 3. School of Mechanical and Automation, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China
Abstract：In order to study the effect of rare earth treatment on the characteristics of inclusions in the grain-oriented silicon steels,the composition,morphology,size and quantity of inclusions were analyzed in the hot-rolled grain-oriented silicon steels after rare earth treatment using FE-SEM/EDS and image analysis software,and the effect mechanism was elucidated. The research results show that the typical inclusions were irregular MnS-AlN composite inclusions and flake or strip AlN inclusions in the rare-earth free samples. The inclusions mainly include spherical or ellipsoidal CeS-LaS,CeS-LaS-AlN,Ce2O2S-La2O2S composite inclusions and AlN inclusions in the rare-earth added samples. Rare earth treatment effectively improves the morphology of inclusions,especially the morphology of large size nitrogen sulfide,and no MnS type inclusions were detected in the steel. Although the number of inclusions increases, and the average size of inclusions larger than 5 μm increased most obviously (0.89 μm) after so much rare-earth added in the steel,the average size of all detected inclusions only increases by 0.40 μm. Due to the excellent desulphurization effect of rare-earth and difference of lattice constant between rare-earth sulfide and AlN,the quantity density and area percent of nitrogen sulfide in steel was reduced. The addition of rare earth reduced the equilibrium product of AlN at the solidification front of the steel, leading to more AlN inclusions precipitating, and AlN appears to grow to a certain extent. Rare earth elements inhibit the precipitation of MnS at the solidification front, which is beneficial to the precipitation of more MnS and AlN used as inhibitors during hot rolling and normalizing process. In the fully deoxidized grain-oriented silicon steels, it is expected to exert the inhibition effect of MnS and AlN and alloying effect of Ce-La by appropriately reducing the content of acid-soluble aluminum in the steel and adjusting the addition amount of rare earth in the steel, and large size inclusions don′t generate. In addition,the micro structure and rolling workability of the steel can be improved by controlling the morphology of inclusions after rare earth elements are added.
解晓辉, 刘玉龙, 李光强, 陈新元, 朱诚意. Ce-La合金化处理对取向硅钢夹杂物特征的影响[J]. 钢铁, 2021, 56(11): 122-134.
XIE Xiao-hui, LIU Yu-long, LI Guang-qiang, CHEN Xin-yuan, ZHU Cheng-yi. Effect of Ce-La alloying treatment on characteristics of inclusions in grain-oriented silicon steels[J]. Iron and Steel, 2021, 56(11): 122-134.
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