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

Journal of Iron and steel Research International 2024年第7期31卷 1680-1691页

作者： Qiang Ren Zhi-yuan Hu Yun-xia Liu Wei-cheng Zhang Zi-qi Gao Li-feng Zhang School of Mechanical Engineering Yanshan UniversityQinhuangdao 066004HebeiChina School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China Research and Development Department Shougang Zhixin Qian'an Electromagnetic Material Co.Ltd.Qian'an 064400HebeiChina School of Mechanical and Materials Engineering North China University of TechnologyBeijing 100144China

The effect of lanthanum on the characteristics of inclusions in the slab of non-oriented electrical steels was investigated through industrial trials and thermodynamic *** 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 *** the lanthanum-free slab,inclusions were predominately ***_(2)O_(3),MgO,and AlN as well as a small number of Al_(2)O_(3)-MgO-CaO and *** 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 *** 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 *** 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 ***-bearing inclusions were more likely to agglomerate AlN by inducing the heterogeneous nucleation of AlN on their surface,while small-size ***_(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

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Formation of Edge Crack in 1.4%Si non-oriented electrical steel during Hot Rolling

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Journal of Iron and steel Research International 2014年第2期21卷 269-274页

作者： Ai-hua CHEN Hai-rong GUO Hua-long LI Toshihiko EMI Institute of Research of Iron and steel Shasteel

Microstructure evolution, dynamic recrystallization, high temperature oxidation and hot ductility of 1.4 % Si non-oriented electrical steel sheets were investigated to reduce edge cracking. The causes of cracking were found to be coarse as-cast microstructure, grain boundary oxidation in reheating furnace, lack of dynamic recrystallization during hot rolling and increase of temperature, resulting in reduced hot ductility in strip edge region. Countermeas- ures against the edge crack are proposed accordingly. Lowering reheating temperature and reducing holding time re- duced oxidation and decarburization. Hot charging temperature was increased to decrease reheating temperature. And using an edger can refine microstructure in strip edge region. Finally, edge heater can be added to increase edge re- gion formability by inducing dynamic reerystallization and ductility by increasing temperature.

关键词： edge crack non-oriented electrical steel hot rolling

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Calculation of AlN and MnS Precipitation in non-oriented electrical steel Produced by CSP Process

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Journal of Iron and steel Research International 2008年第5期15卷 88-94页

作者： XIANG Li YUE Er-bin FAN Ding-dong QIU Sheng-tao ZHAO Pei State Key Laboratory of Advanced steel Processing and Products National Engineering Research Center of Continuous Casting Technology Central Iron and Steel Research Institute Beijing 100081 China

Combining with the study of analogue experiments and test analysis, the kinetics of precipitation and growth of AlN and MnS in non-oriented electrical steel produced by the CSP process is calculated. The results show that the precipitate phase particles of AlN and MnS in typical non-oriented electrical steel grades produced by the CSP process have grown to some extent in the soaking stage, but the precipitation contents are less than 20% of the total contents of nitride and sulfide. The precipitate phase particles of AlN and MnS have precipitated almost after the hot rolling process. The precipitation contents are more than 80% of the total contents of nitride and sulfide, but it is very late for the precipitate phase particles to grow at the end of the hot rolling process.

关键词： CSP non-oriented electrical steel calculation AlN precipitation MnS precipitation

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Effect of Heating Rate on Microstructure Evolution and Magnetic Properties of Cold Rolled non-oriented electrical steel

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Journal of Iron and steel Research International 2010年第11期17卷 54-61页

作者： WANG Jian LI Jun WANG Xin-feng TIAN Jian-jun ZHANG Cai-hong ZHANG Shen-gen School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Research Institute Baoshan Iron and Steel Co Ltd Shanghai 200900 China Beijing Vocational College of Electronic Science Beijing 100026 China

The effects of heating rate （ranging from 50 to 300 ℃/s） during the final annealing process on microstructure evolution and magnetic properties of cold rolled non-oriented electrical steel were investigated. It was found that increasing heating rate increased the nucleation temperature and complete recrystallization temperature. At the same time, heating rate increasing could cause the substantially refined structures for the recrystallization grains and this grain refinement would decline when the heating rate was beyond 50 ℃/s. The recrystallization texture exhibited pronounced improvement with heating rate, such as the intensity decrease of 〈111〉//ND （normal direction） fiber and the intensity increase of { 110}%〈001〉 Goss texture component. The texture improvement and grain size refinement caused by heating rate increasing resulted in complicated variation of the magnetic properties. The magnetic induction （B50） keeps increasing while heating rate increases from 15 to 300 ℃/s which is due to the recrystallized texture optimization caused by rapid heating. The core losses （P1.5/50） decrease while heating rate increases from 15 to 100 ℃/s; however, the core losses would increase when heating rate is higher than 100 ℃/s, which is caused by the mean grain size refinement after rapid heating annealing. The results indicate that recrystallization texture and the magnetic properties of the non-oriented electrical steel can be improved definitely by rapid heating during the final annealing treatment.

关键词： non-oriented electrical steel heating rate texture core loss magnetic induction

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Evaluation of Microstructure and Magnetic Properties in non-oriented electrical steel Strained by Tension

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Journal of Iron and steel Research International 2016年第2期23卷 166-170页

作者： J.SALINAS B. A.SALINAS R. Engineering Metallurgical Research Center and Advanced Studies of National Polytechnic Institute

The effects of deformation on the microstructure and magnetic properties of non oriented electrical steels were investigated. Box annealed electrical steel sheets were deformed by tension at four different strains： 3%, 8%, 12 % and 25 % The internal grain misorientation caused by tensile deformation was measured by electron backscat- tering diffraction （EBSD） with grain orientation spread （GOS） as an indicator of the lattice distortion. The experi- mental results showed that the average GOS value increases with the strain. The microstructure and crystallographic texture of deformed samples did not show a significant change in samples strained below 25 %. However, the mag- netic properties were strongly affected： coercivity was directly proportional to the square root of the GOS value and energy losses increased as the strain level was increased.

关键词： non-oriented electrical steel tensile deformation internal misorientation magnetic property EBSD

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High temperature plastic deformation behavior of non-oriented electrical steel

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Journal of Central South University 2009年第1期16卷 25-31页

作者：肖于德李敏王伟周娟吴光亮彭跃明 School of Materials Science and Engineering Central Sourth University Hunan Valin Lianyuan Iron and steel Company

High temperature plastic deformation behavior of non-orientated electrical steel was investigated by Gleeble 1500 thermo-mechanical simulator at strain rate of 0.01-10 s^-1 and high temperature of 500-1 200 ℃. The stress level factor （a）, stress exponent （n）, structural factor （A） and activation energy （Q） of high temperature plastic deformation process of non-orientated electrical steel in different temperature ranges were calculated by the Arrhenius model. The results show that, with dynamic elevation of deformation temperature, phase transformation from α-Fe to γ-Fe takes place simultaneously during plastic deformation, dynamic recovery and dynamic recrystallization process, leading to an irregular change of the steady flow stress. For high temperature plastic deformation between 500 and 800 ℃, the calculated values of a, n, A, and Q are 0.039 0 MPa 1, 7.93, 1.9× 10^18 s^-1, and 334.8 kJ/mol, respectively, and for high temperature plastic deformation between 1 050 and 1 200 ℃, the calculated values of a, n, A, and Q are 0.125 8 MPa1, 5.29, 1.0 × 10^28 s^-1, and 769.9 kJ/mol, respectively.

关键词： non-oriented electrical steel plastic deformation flow stress

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Development history and technological progress of non-oriented electrical steel sheets at Baosteel

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Baosteel Technical Research 2013年第4期7卷 48-55页

作者： LIU Xiandong CHEN Mao WANG Bo WANG Feng Silicon steel Department Baoshan Iron & Steel Co.Ltd.

This paper briefly summarized the development history, product catalogue and magnetic properties of non- oriented electrical steel sheets at Baosteel, as well as the development and application of high-value-added steel grades. Recent advances in manufacturing electrical steel sheets were also introduced, including technologies for controlling inclusion,for producing high-grade steel strips by a tandem rolling mill and for controlling the transverse thickness difference of steel sheets, and the development of environmentally friendly coatings.

关键词： non-oriented electrical steel magnetic property inclusion transverse thickness difference environmentallyfriendly coating steel grade development

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Effects of RE on precipitation behaviors of the inclusions and magnetic properties of non-oriented electrical steel

Effects of RE on precipitation behaviors of the inclusions a...

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2014中国功能材料科技与产业高层论坛

作者： Zhu Chengyi Chen Xianhong Zhang Feng Li Guangqiang Fu Yong The State KeyLaboratory of Refractories and Metallurgy Key Laboratory of Ferrous Metallurgy and Resources Utilization Ministry of EducationWuhan University of Science and Technology Silicon steel Department Baoshan Iron & steel Co.Ltd.

Effects of RE addition on deoxidation and desulphurization efficiency,precipitation behaviors of the inclusions,microstructure and magnetic properties of the finished sheets have been investigated for nooriented electrical steel produced in industrial *** most suitable addition amount of RE alloy added in the electrical steel bearing is proposedfor excellentdeoxidation and desulphurization *** added into the steel can form larger and high melt point RE oxides,RE sulfides and RE oxysulfides inclusions removing from the bath by floating which decreases the numbers and increases the size of the fine *** average size of the inclusions remained in the steel is 0.8μm.4μ*** content affects grain size by influencing number and size of fine inclusions in the finished steel *** magnetic flux density of the finished steel sheets dereases with the increase of RE content while the lowest core loss of it has an optimum RE content in the *** the steel bearing 1.15wt%Si,the content of RE should be strictly controlled in the range from 20×10wt%to60×10wt%.

关键词： non-oriented electrical steel RE treatment non-metallic inclusions microstructure magnetic properties

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Effect of lanthanum content on microstructure and magnetic properties of non-oriented electrical steels

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Journal of Rare Earths 2013年第7期31卷 727-733页

作者：万勇陈伟庆吴绍杰 State Key Laboratory of Advanced Metallurgy School of Metallurgical and Ecological EngineeringUniversity of Science and Technology Beijing Technology Center of Xinyu Iron and steel Co. Ltd.

The effect of lanthanum content in the range of 04）.01 1 wt.%, on the inclusion size distribution, microstructure, texture and magnetic properties of three non-oriented electrical steels was studied. After final annealing, lanthanum effectively inhibited the precipitation of MnS precipitates in steel, the formations of La2O2S and LaS inclusions not only acted as nuclei of AlN precipitates, but also combined with A1203 and formed composite inclusions with larger size. Grain size firstly increased and then decreased with lanthanum content increasing. steel containing 0.0066 wt.% lanthanum obtained the largest grain size, the strongest { 110} 〈 110〉 texture and the weakest { 112}〈110〉 texture among all the tested steels. Magnetic flux density firstly increased and then decreased, core loss firstly dramatically decreased and then slightly decreased with lanthanum content increasing. Among the three tested steels, steel with 0.0066 wt.% lanthanum demonstrated the best comprehensive magnetic properties mainly through the development of favorable texture and appropriate final grain size.

关键词： lanthanum non-oriented electrical steel grain size texture magnetic property rare earths

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Fatigue Cracking Characterization of High Grade non-oriented electrical steels

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Journal of Wuhan University of Technology(Materials Science) 2017年第6期32卷 1329-1335页

作者：杜丽影周桂峰 LIU Jing SHI Wenmin BI Yunjie CHENG Zhaoyang XUE Huan The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and Technology Wuhan 430081 China Wuhan Branch of Baosteel Central Research Institute (R&D Center of Wuhan Iron & steel Co. Ltd.) Wuhan 430080 China

The fatigue behavior of 30 WGP1600 non-oriented electrical steel, which is generally used in the motors for electrical vehicles, was investigated. The detailed microstructure and dislocation configurations of the fatigue specimens were examined by OM, SEM, and TEM. The test results showed that fatigue cracks were commonly initiated from the surface grain boundaries, crystals plane, and inclusions. The rapid fatigue crack propagation was characterized by transgranular cleavage fracture, while most transient fracture exhibited ductile tearing characteristics. After cyclic deformation of the non-oriented electrical steels, various dislocation structures, such as short and thick lines, veins, persistent slip bands, cells, and labyrinth, were observed.

关键词： non-oriented electrical steel fatigue behavior crack initiation crack propagation dislocation structure

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