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China Foundry 2024年第1期21卷 51-59页

作者： Dong Pan Qing-tao Guo Kai-lun Zhang Fu-zhi Yu Yu-ying Li Yu-bao Xiao State Key Laboratory of Metal Materials for Marine Equipment and Application Anshan 114009LiaoningChina Ansteel Beijing Research Institute Co. Ltd.Beijing 102200China

Electromagnetic stirring is one of the widely applied techniques to modify the quality of casting *** from conventional rotate stirring,the helical stirring is more professional in assisting multi-dimensional flow of molten metal and eliminating solidification *** this study,the single-winding helical stirring(SWHS)was introduced,offering advantages such as smaller volume and lower electromagnetic shielding compared to traditional helical stirring *** a comprehensive numerical simulation,the stirring parameters of SWHS were adjusted to yoke inclination angle of 43°and frequency of 12 *** higher electromagnetic force and flow velocity in drawing direction,as well as the lower temperature gradient induced by the SWHS,are positive factors for homogeneous solidification of *** experimental results on Al-8%Si alloy and 0.4%C-1.1%Mn steel demonstrate that compared to rotate stirring,the SWHS process can induce better billet quality and is more effective in accelerating the equiaxed expansion and reducing element *** SWHS process can enhance the equiaxed ratio of the billet by 58.3%and reduce segregation degree of carbon element by 10.97%.Consequently,SWHS holds great promise as a potential approach for improving the quality of continuous casting billets.

关键词： billet electromagnetic stirring helical solidification element segregation numerical simulation

Effects of electromagnetic field and lubricate condition on the surface quality of magnesium alloy billet during LFEC processing

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Science China(Technological Sciences) 2009年第1期52卷 180-185页

作者： QiChi Le ZhiQiang Zhang JianZhong Cui Key Laboratory of Electromagnetic Processing of Materials Ministry of Education Northeastern University Shenyang 110004 China

The microstructures of the magnesium billets could be improved markedly by low-frequency electro-magnetic casting (LFEC) processing. In fact, the low-frequency electromagnetic field (LFEF) also has favorite effect on the surface quality of billet. However, few public reports on the surface quality of LFEC magnesium billets could be found. Therefore, a new crystallizer with a metal internal sleeve to-gether with a kind of lubricant was designed aiming at lowing surface turning quantity, and the effects of casting velocity, electromagnetic condition and lubrication on the surface quality of magnesium billets were investigated. The results indicate that LFEF together with the lubricate condition would be responsible for the surface quality of the billets, and the high surface quality billets could be achieved by optimizing the casting conditions.

关键词： magnesium alloy billet low-frequency electromagnetic casting (LFEC) lubrication surface quality

Numerical Simulation and Experimental Study of F-EMS for Continuously Cast billet of High Carbon Steel

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Journal of Iron and Steel Research(International) 2014年第S1期21卷 51-55页

作者： Sen LUO Feng-yun PIAO Dong-bin JIANG Wei-ling WANG Miao-yong ZHU School of Materials and Metallurgy Northeastern University

A final electromagnetic stirring model was developed for billet continuous casting of high carbon steel using the commercial software ANSYS and CFX, and the numerical model was validated by the magnetic flux density measured under a Teslameter CT-3. The magnetic flux density and fluid flow in the liquid pool at the location of final electromagnetic stirring(F-EMS) were calculated by the present numerical model. Meanwhile, the plant trials were carried out to determine the optimum current intensity and frequency of F-EMS for the continuously cast billet of high carbon steel. The numerical results show that, through increasing the current intensity by 100 A, the corresponding increases of magnetic induction intensity, tangential electromagnetic force and flow velocity at the solid/liquid interface in the strand are 0.025 T, 1933 N/m3 and 6.9 cm/s, respectively. Moreover, the industrial trial results showed that for the continuously cast billet of 60 steel, the optimum current intensity and frequency of F-EMS, which is 8.2 m from the meniscus, are respectively 380 A and 6 Hz. With the optimum F-EMS parameters, the significant improvement of center segregation of billet is achieved, and the center carbon segregation index in billet reaches 1.04.

关键词： billet F-EMS center segregation numerical simulation industrial trial

Analysis of High-Cr Cast Iron/Low Carbon Steel Wear-resistant Laminated Composite Plate Prepared by Hot-rolled Symmetrical billet

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Computer Modeling in Engineering & Sciences 2018年第10期117卷 109-123页

作者： Yanwei Li Yugui Li Peisheng Han Shun Wang Zhengyi Jiang Xiaogang Wang Shanxi Provincial Key Laboratory of Metallurgical Device Design Theory and Technology(State Key Laboratory Cultivation Base of Province-Ministry Co-Construct) Taiyuan University of Science and TechnologyTaiyuanChina School of Mechanical Materials and Mechatronic EngineeringUniversity of WollongongWollongong NSW2522Australia

This study developed a new technology for preparing high-chromium cast iron(HCCI)/low-carbon steel(LCS)wear-resistant composite plates by hot rolling at a 1050°C and a rolling speed of 0.2 m/*** effects of different rolling reductions(30%,45%,and 60%)on the microstructure(interface and HCCI layer)and mechanical properties(bonding strength,hardness,and wear resistance)of the composite plate were *** images showed that when the reduction was increased,no impurities and interlayers were found between the microscopic interfaces after hot rolling,and the bonding interface exhibited a wave-like *** analysis showed that the Cr element diffusion between two metals after hot rolling was promoted when the reduction was increased,thereby improving the bonding quality under the same rolling temperature and rolling *** showed that due to the stress release effect of the LCS of the cladded layer,the macro-slab shape after hot rolling performed well,and the brittle HCCI layer underwent thermoplastic deformation without ***,the increase of rolling reduction improved the bonding *** the rolling reduction was increased,the volume fraction of Cr-carbides in the HCCI layer also increased,resulting in an increase of hardness and wear-resistance.

关键词： High chromium cast iron symmetrical billet hot rolled laminated composite plate

Simulating Calculation of Frictional Force between Mold and billet

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Journal of Iron and Steel Research(International) 1998年第1期5卷 13-16页

作者： Xu Guangming Cui Jianzhong Na Xinjie Northeastern University

Assumption about the inner surface of mold is made according to the forming mechanisms of frictional force. The frictional force between billet and mold can be analysed by calculating the thermal shrinkage and the shearing strength of the *** model is used to calculate the maximum drawing speed at different conditions. The results are very satisfactory.

关键词： simulating calculation frictional force mold billet

Numerical Simulation and Applications of F-EMS for High Carbon Steel billet

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Journal of Iron and Steel Research(International) 2011年第S2期18卷 268-274页

作者： WEI Xiao-dong, ZHANG Jiong-ming, XIAO Chao, HU Zhao-fan, YUAN Yang-yang (School of Metallurgical and Ecological Engineering University of Science and Technology Beijing, Beijing 100083, China) Univ Sci & Technol Beijing Sch Met & Ecol Engn Beijing 100083 Peoples R China

The distribution of electromagnetic fields and electromagnetic force of F-EMS were simulated by ANSYS12.0 software. The magnetic induction intensity and electromagnetic force of billet with various stirring parameters were cal- culated, then the relationship between the magnetic induction intensity and electromagnetic force was calculated. The results showed that the electromagnetic force is not positive with the magnetic induction intensity. Depending on the com- bination of the practical production, the central segregation of high carbon steel SWRH77B is improved effectively under the best stirring parameter that the current is 360A and the frequency is 12Hz.

关键词： billet numerical simulation magnetic induction intensity electromagnetic force segregation

PREDICTION OF SURFACE DEFECTS IN DISK FORGING PROCESS FOR FGH95 ALLOY USING RING-LIKE billet BY COMPUTER SIMULATION

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中国有色金属学会会刊：英文版 1998年第4期8卷 36-38页

作者： Li Yuanchun, Cui Jian and Yan Minggao Beijing Institute of Aeronautical Materials, Beijing 100095, P. R. China

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关键词： rigid visco plastic FEM ring like billet surface defects

Research on segregation control for round billet of anti-sulfur steel

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Baosteel Technical Research 2020年第1期14卷 1-7页

作者： WANG Yingchun LIU Qilin LI Ying Research Institute Baoshan Iron&Steel Co.Ltd.Shanghai 201999China Tube Pipe and Bar Business UnitBaoshan Iron&Steel C o.L td.Shanghai 200940China School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina

The carbon segregation that occurs in a round billet leads to instability in the anti-sulfur steel *** maximum difference in the C content of these billets can reach 0.08%,and the equiaxed grain ratio is about 37.0%.In this paper,reasonable casting and mixing parameters were obtained by a study of the casting process,mold electromagnetic stirring,and the final electromagnetic stirring ***,a mathematical model was established for the solidification and heat transfer of round-billet continuous casting using the characteristics of the continuous-casting process for sulfur-resistant steel *** relationship between the casting speed,cooling-water ratio,and thickness of the shell at the final stirring position was ***,the electromagnetic force and the liquid steel flow velocity were simulated and used to obtain reasonable parameters for the mold and final electromagnetic *** optimization of the casting and electromagnetic stirring technologies,the equiaxed grain ratio of the continuous-casting round billet increased to 53.4%and the maximum difference in the C content of the billet reduced to 0.031%.

关键词： round billet segregation electromagnetic stirring

Extensive Analysis of Multi Strand billet Caster Tundish Using Numerical Technique

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World Journal of Mechanics 2019年第2期9卷 29-51页

作者： Rohit Agarwal Mrityunjay K. Singh Ram Bachchan Kumar Biswajit Ghosh Sudhansu Pathak Tata Steel Limited Jamshedpur India

Continuous casting of steel involving different grades in the same casting sequence remains a challenge to billet caster operators. The intermixed composition obtained during the grade change does not meet the specification of either grade and must be downgraded. Incorrect identification of this intermixed region may result in non-conforming products reaching the customer. In this study, a numerical model based on CFD (computational fluid dynamics approach) has been developed which predicts the start and end of the intermixed composition and the tonnage to be downgraded under different casting conditions. This model was validated and the results were in good agreement with the actual plant data for a 6-strand billet caster at LD-1 of TATA Steel, India. This model is used to calculate transition tonnage for different scenarios, e.g. when one of the outermost strands is not functional or some combinations are not functional and varying casting speed during operation. Furthermore, impact of different design of baffles on performance of Tundish has been evaluated to find a way to reduce transition or intermixed composition.

关键词： Continuous Casting CFD billet Tundish Grade Change Modelling Quality Control Fluid Flow Heat Transfer

Rheologic behaviors of A356 aluminum alloy billet produced by semisolid continuous casting process

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China Foundry 2004年第1期1卷 62-66页

作者： Shuming Xing Lizhong ZHANG Yunhui DU Daben ZENG Jinlin TANG Department of Mechanical Engineering Beijing Jiaotong University Beijing 100044 P.R. China Department of Meclanical Engineering Tsinghua University Beijing 100084 P.R.China

The experiments for rheologic behaviors of semisolid continuous casting billets of A356 alloy in semisolid state had been carried out with a multifunctional rheometer. The results show that the deformation rate increases with loading time, the maximum strain reaches to 120％（which is one time larger than that of traditional mold casting billet） and the strain can be rapidly eliminated to 10％ after unloading. Moreover, there is a critic stress for billet deformation even in semisolid state, which is named as critic shear stress. This stress increases with the decreasing of heating time. The theologic behaviors can be expressed by five elements mechanical model （H2- [N1|H2]-[N2|S]） and can be modified with the increasing of heating time.

关键词： semisolid continuous casting billet aluminum alloy rheologic behavior