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Flow and heat transfer of liquid slag in a continuous casting mold

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Journal of Iron and Steel Research International 2019年第9期26卷 926-940页

作者： Hai-biao Lu Chang-gui Cheng Yang Li Xu-feng Qin Yan Jin The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081HubeiChina Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steelmaking Wuhan University of Science and TechnologyWuhan 430081HubeiChina

A three-dimensional mathematical model for coupled liquid steel and liquid slag was established to study the flow and heat transfer behavior of liquid slag. Based on the volume of fluid method and the heat transfer model, the effect of different casting parameters on the flow and heat transfer of the liquid slag was investigated. The results show that there are two different size recirculation zones of the liquid slag layer on the liquid steel in the mold center plane, extending from the submerged entry nozzle to the mold narrow face. With the increase in the casting speed and the decrease in the viscosity of the mold flux, the overall velocity and the temperature of the liquid slag increase. With the increase in the inclination angle and the submergence depth of the submerged entry nozzle, the temperature of the liquid slag decreases, and the velocity decreases near the mold narrow face and increases in the vicinity of the submerged entry nozzle. The inactive flow field and the low temperature of liquid slag within 100 mm of the submerged entry nozzle may intensify the surface longitudinal cracking sensitivity of the slab. When the lubrication and heat transfer are well regulated between the surface of mold and the mold flux film, low casting speed, large inclination angle and submergence depth of the submerged entry nozzle are beneficial for reducing the possibility of a slab surface longitudinal crack.

关键词： continuous casting Liquid slag Flow Heat transfer Surface longitudinal cracking sensitivity Mathematical simulation

Nonlinear continuous bi-inductance electrical line with dissipative elements:Dynamics of the low frequency modulated waves

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Chinese Physics B 2020年第4期29卷 179-189页

作者： S M Ngounou F B Pelap Unite de Recherche de Mecanique et de Modelisation des Systèmes Physiques(UR-2 MSP) Faculte des SciencesUniversite de DschangBP 69 DschangCameroun Unite de Recherche de Matiere Condensee d'Electronique et de Traitement du Signal(UR-MACETS) Faculte des SciencesUniversite de DschangBP 67 DschangCameroun

The dynamics of modulated waves in a nonlinear bi-inductance transmission line with dissipative elements are *** show the existence of two frequency modes and carry out intensive investigations on the low frequency *** to the multiple scales method,the behavior of these waves is investigated and the dissipative effects are *** appears that the dissipation coefficient increases with the carrier wave *** the continuous approximation,we derive that the propagation of these waves is governed by the complex Ginzburg-Landau equation instead of the Korteweg-de-Vries equation as previously *** studies of the dynamics of plane waves in the line reveal the existence of three additional regions in the dispersion curve where the modulational phenomenon is *** the low frequency mode,we demonstrate that the network allows the propagation of dark and bright *** findings are in perfect agreement with the analytical predictions.

关键词： dissipative bi-inductance network low frequency mode continuous approximation complex Ginzburg-Landau equation

Grain size model for continuous dynamic recrystallization of titanium alloy in hot deformation

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Science China(Technological Sciences) 2018年第11期61卷 1688-1695页

作者： LI Lian LI MiaoQuan School of Materials Science and Engineering Northwestern Polytechnical University

The continuous dynamic recrystallization(CDRX) through a progressive transformation of a subgrain structure into a grain structure with the increasing of misorientation occurred in the hot deformation of titanium alloy. A grain size model for CDRX of titanium alloy in hot deformation considering work hardening effect, dynamic softening effect and non-homogeneous deformation effect was established. The β grain size was described as functions of the deformation temperature, strain rate and strain by using the dislocation density as an internal state variable. The inside dislocation storage and dislocation annihilation,which respectively resulted from work hardening effect and dynamic softening effect, were described by the Kocks-Mecking and Picu-Majorell theories correspondingly. The dislocation density rate associated with non-homogeneous deformation effect was done in terms of the Ashby theory. The material constants in the present model were determined via genetic algorithm(GA)-based objective optimization technique. Applying the grain size model to the hot deformation of Ti-5Al-2Sn-2Zr-4Mo-4Cr, the maximum difference between the calculated and experimental β grain size was 8.2%. Moreover, the effect of deformation temperature and strain rate on the β grain size in the hot deformation of Ti-5Al-2Sn-2Zr-4Mo-4Cr was calculated, indicating that the β grain size increased with the increasing of deformation temperature and the decreasing of strain rate.

关键词： titanium alloy continuous dynamic recrystallization model β grain size

LATERAL STABILITY OF ALTERNATIVE HORIZONTAL LEVITATION ELECTROMAGNETIC continuous CASTING OF ALUMINIUM SHEET

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中国有色金属学会会刊：英文版 1998年第3期8卷 86-89页

作者： Deng, K Shen, M Ren, ZM Shanghai Univ Coll Mat Sci & Engn Shanghai 200072 Peoples R China Shanghai Univ Shanghai Inst Appl Math & Mech Shanghai 200072 Peoples R China

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１ＩＮＴＲＯＤＵＣＴＩＯＮＡｌｔｅｒｎａｔｉｖｅｅｌｅｃｔｒｏｍａｇｎｅｔｉｃｃｏｎｔｉｎｕｏｕｓｃａｓｔｉｎｇｉｓａｈｉｇｈｌｉｇｈｔｅｄｎｅｗｔｅｃｈｎｉｑｕｅ．Ｉｎｔｈｉｓｔｅｃｈｎｉｑｕｅｔｈｅｅｌｅｃｔｒｏｍａｇｎｅｔｉｃｆｏｒｃｅｐｒ...

关键词： stability horizontal continuous casting electromagnetic casting aluminium sheet

Numerical simulation of macrosegregation in billet continuous casting influenced by electromagnetic stirring

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Journal of Iron and Steel Research International 2022年第4期29卷 612-627页

作者： Qi-peng Dong Jiong-ming Zhang Yan-bin Yin Hiromi Nagaumi School of Iron and Steel High-Performance Metal Structural Materials Research InstituteSoochow UniversitySuzhou 215021JiangsuChina State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

A three-dimensional numerical model coupling the macrosegregation and magnetohydrodynamic simulations was developed to investigate the effects of electromagnetic stirring(EMS)on the *** results show that a significant swirling flow was induced by the in-mold EMS,which further changed the shape of the solidification shell and homogenized the solute elements in ***,the effects were only confined to the initial billet *** improvement in centerline segregation was observed with the usage of the final EMS(F-EMS),which led to the forced convection at the final solidification *** solute elements in the mushy zone were significantly even,with the maximum segregation degree of solute C reducing from 1.311 to *** addition,the effects of the stirrer positions and currents of F-EMS on the macrosegregation alleviation were numerically *** values of centerline segregation were predicted with various stirrer positions and currents,and there is an optimum stirrer parameter to obtain the best macrosegregation *** the experimental conditions,the optimum position was about 7 m away from meniscus,and the optimum current was 300 A.

关键词： Numerical simulation Macrosegregation Electromagnetic stirring continuous casting

Stability condition of semisolid continuous casting process

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中国有色金属学会会刊：英文版 2001年第1期11卷 51-53页

作者：邢书明曾大本胡汉起马静李亚敏 Tsing Hua Univ Dept Mech Engn Beijing 100084 Peoples R China Univ Sci & Technol Beijing Foundry Inst Beijing 100083 Peoples R China Hebei Univ Sci & Technol Dept Mat Sci & Engn Shijiazhuang 050054 Peoples R China

The major unsteady phenomena in semisolid continuous casting process are the breakage and breakout. The essential reasons for them are the passageway blocking or the solidified shell too thin to endure the withdrawal force because of the remained shell formed at the beginning and its developing afterwards. Through theoretically analyzing the crack filling and the remained shell developing, stability conditions were presented. The essential one of them is that the stress acted on the semisolid slurry must be larger than the yield stress of it. The condition without breakage is to build a balance between the increase of the remained shell resulted in solidifying and the decrease of it resulted in flowing of the semisolid slurry. The condition without breakout is to ensure the solidified thickness larger than the safe thickness. The corresponding mathematical formulas of these conditions were set up and the verification experiments show that these conditions are reliable in applications. [

关键词： semisolid metal continuous casting stability condition breakage breakout

Experimental test of error-disturbance uncertainty relation with continuous variables

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Photonics Research 2019年第11期7卷 I0012-I0016页

作者： Yang Liu Haijun Kang Dongmei Han Xiaolong Su Kunchi Peng State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-ElectronicsShanxi UniversityTaiyuan 030006China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

The uncertainty relation is one of the fundamental principles in quantum mechanics and plays an important role in quantum information science. We experimentally test the error-disturbance uncertainty relation(EDR) with continuous variables for Gaussian states. Two incompatible continuous-variable observables, amplitude and phase quadratures of an optical mode, are measured simultaneously using a heterodyne measurement *** EDR values with continuous variables for coherent, squeezed, and thermal states are verified *** experimental results demonstrate that Heisenberg’s EDR with continuous variables is violated, while Ozawa’s and Branciard’s EDRs with continuous variables are validated.

关键词： continuous relation variables

NUMERICAL　SIMULATION　OF　ALTERNATIVE　HORIZONTAL　LEVITATION　ELECTROMAGNETIC　continuous　CASTING（Ⅱ）

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中国有色金属学会会刊：英文版 1996年第4期6卷 42-46页

作者： Zhu Shoujun Ren Zhongming Deng Kang Jiang Guochang(Shanghai Enhanced Laboratory of Ferrometallurgy,Shanghai University,Shanghai 200072) SHANGHAI UNIV SHANGHAI ENHANCED LAB FERROMETSHANGHAI 200072PEOPLES R CHINA

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ＮＵＭＥＲＩＣＡＬＳＩＭＵＬＡＴＩＯＮＯＦＡＬＴＥＲＮＡＴＩＶＥＨＯＲＩＺＯＮＴＡＬＬＥＶＩＴＡＴＩＯＮＥＬＥＣＴＲＯＭＡＧＮＥＴＩＣＣＯＮＴＩＮＵＯＵＳＣＡＳＴＩＮＧ（Ⅱ）￥ＺｈｕＳｈｏｕｊｕｎ；ＲｅｎＺｈｏｎｇｍｉｎｇ；ＤｅｎｇＫａｎｇ；Ｊｉａｎ...

关键词： horizontal electromagnetic continuous casting electromagnetic levitation numerical simulation

Electromagnetic continuous casting by imposing multi-electromagnetic field

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中国有色金属学会会刊：英文版 2000年第6期10卷 741-744页

作者：张志峰李廷举温斌姚山金俊泽 Dalian Univ Technol Res Ctr Foundry Engn Dalian 116023 Peoples R China

In order to obtain cast metal of high quality, an investigation was carried out by simultaneous imposition of multi electromagnetic fields from the outside of a cold crucible copper mold. Sn 4.5%Pb as a simulator of high melting point metal was continuously cast under different conditions. The results show that multi electromagnetic fields can eliminate surface defects, and coarse columnar grains of the solidification structure is turned into equiaxed crystal with the increase of magnetic flux density. Moreover, finer equiaxed crystal structure is obtained when rapidly solidified sheet is fed into the mold during continuous casting.[

关键词： continuous casting multi electromagnetic field heredity effect quality of cast meta0