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Mathematical Model for Electroslag Remelting Process

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Journal of Iron and Steel Research International 2007年第5期14卷 7-12,30页

作者： DONG Yan-wu JIANG Zhou-hua li zheng-bang School of Materials and Metallurgy Northeastern University Shenyang 110004 Liaoning China Institute for Metallurgical Technology Central Iron and Steel Research Institute Beijing 100081 China

A mathematical model, including electromagnetic field equation, fluid flow equation, and temperature field equation, was established for the simulation of the electroslag remelting process. The distribution of temperature field was obtained by solving this model. The relationship between the local solidification time and the interdendritic spacing during the ingot solidification process was established, which has been regarded as a criterion for the evaluation of the quality of crystallization. For a crucible of 950 mm in diameter, the local solidification time is more than 1 h at the center of the ingot with the longest interdendritic spacing, whereas it is the shortest at the edge of the ingot according to the calculated results. The model can be used to understand the ESR process and to predict the ingot quality.

关键词： electroslag remelting mathematical model interdendritic spacing local solidification time

Metal Functional Materials and Their Industrialization on Turn of the Century

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Journal of Iron and Steel Research International 2000年第2期7卷 37-44页

作者： GUO Pei-min ZHANG Jia-wen li zheng-bang Central Iron & Steel Research Institute

A brief introduction of the connotation and characteristics of metal functional materials was presented. The current research and development of several important materials and the difference between home and world advanced level were described. The latest trend of research and development was discussed. The industrialization and market for several new metal functional materials were commented and some opinions also were given.

关键词： metal functional materials research and development market

Research of Mold Powder for Ultra-Low Carbon Steel

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Journal of Iron and Steel Research International 2001年第1期8卷 11-15页

作者： WU Jie li zheng-bang liN Gong-wen Central Iron & Steel Research Institute

A new pattern recognition method of shape was presented based on artificial neural network theory. The method avoids the defects of shape pattern recognition with polynomials and it has strong disturbance resistance. It has been proved to be superior in recognizing different shape patterns by identifying many sorts of working sample books which the results are known.

关键词： shape pattern recognition artificial neural network

Segregation of Niobium During Electroslag Remelting Process

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Journal of Iron and Steel Research International 2009年第1期16卷 7-11页

作者： DONG Yan-wu JIANG Zhou-hua li zheng-bang School of Materials and Metallurgy Northeastern University Shenyang 110004 Liaoning China Central Iron and Steel Research Institute Beijing 100081 China

Experiment was carried out after the process parameters were calculated by the model previously established. The relationship between interdendritic spacing and local solidification time （LST） mainly determined by process parameters was exposed. Furthermore, the extent of segregation was studied. The results indicate that LST and interdendritic spacing are the largest and the amount of Laves phase as a result of the niobium segregation is the highest in the center of the ingot, whereas the opposite results are obtained at the edge of ingot. The extent of element segregation and the amount of Laves phase can be reduced when appropriate parameters are used. Therefore, the duration of subsequent homogenization treatments for 718 is shortened and the alloy quality is improved.

关键词： electroslag remelting Inconel 718 segregation local solidification time interdendritic spacing

Effect of Low-Frequency AC Power Supply During Electroslag Remelting on Qualities of Alloy Steel

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Journal of Iron and Steel Research International 2009年第4期16卷 7-11页

作者： CHANG li-zhong SHI Xiao-fang YANG Hai-sen li zheng-bang Department of Metallurgical Technology Central Iron and Steel Research Institute Beijing 100081 China School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China

The effect of frequencies of AC power supply on the quality of the electroslag-melted ingot is studied. The results show that with a decrease in the frequency, electromagnetic force becomes more violent, and the temperature in the slag bath becomes more homogeneous, and therefore, the depth of molten metal pool is decreased; electrochemical reactions occur with the decrease in the frequency, and the atomic oxygen electrolyzed dissolves in the molten metal pool; the nonmetallic inclusions, which are distributed dispersively in the ingot, have an increased content, and their size is approximately in the range of 2--3 μm.

关键词： eleetroslag remeltingl low-frequency AC power supplyl molten metal pool oxygen electrolytic reaction

Carbothermic Reduction of MoO_3 for Direct Alloying Process

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Journal of Iron and Steel Research International 2013年第10期20卷 51-56页

作者： ZHU Hang-yu li zheng-bang YANG Hai-sen LUO lin-gen Department of Metallurgical Technology Central Iron and Steel Research Institute

The thermodynamics of Mo-O- C and Ca-Mc-O-C systems was studied in order to understand the carbothermic reduction of molybdenum trioxide, and kinetic studies were also carried out by means of thermogravimetrie analysis under argon atmosphere with a heating rate of 10 ℃/min. Subsequently, reaction products at various temperatures were identified by X-ray diffraction （XRD） and the results confirmed the previous thermodynamics analysis. Mean- while, it was found that intermediate products MoO2 and CaMoO4 appeared in the process of carbothermic reduction of MoO3 with or without CaO, which were subsequently reduced to Mo or molybdenum carbide. An experimentally determined reaction mechanism was proposed and discussed. The reduction reaction of MoO3 with carbon could be divided into two stages. The first stage includes the direct reaction between MoO3 and carbon and the carbon gasifica- tion reaction. The second stage is the gas-solid reaction between CO and MoO2, and the diffusion of gases through the surface of MoO2 determines the overall reaction rate. The activation energies of the mixtures with or without CaO were estimated to be 56.6 and 52.9 kJ/mol, respectively.

关键词： carbothermic reduction molybdenum trioxide stabilizing calcium oxide

Research on Purifying Emulsion Using Electromagnetic Technique and Its Control System

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Journal of Iron and Steel Research International 2000年第2期7卷 32-36页

作者： GUO Pei-min ZHANG Jia-wen YANG Hai-sen li zheng-bang Central Iron & Steel Research Institute

The dynamic process of purifying emulsion using electromagnetic technique has been analyzed and studied by dynamics principle. Based on the results, the purification equipment has been developed and installed in a cold rolling mill. The basic structure characteristics of the purification equipment were described in detail. Emulsion purified by this way can be recycled and used again with cost reduction.

关键词： emulsion electromagnetic technique purification equipment

Study on Electro-Capillary Oscillation in ESR System

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Journal of Iron and Steel Research International 2000年第2期7卷 23-26页

作者： GUO Pei-min ZHANG Jia-wen YANG Hai-sen li zheng-bang Central Iron & Steel Research Institute

The existence of electro-capillary oscillation in alternate current eletroslag remelting was proved by theoretic analysis, dynamic simulation experiment and ESR experiment. The higher the frequency of alternate current, the higher oscillation frequency of interface between slag pool and metal pool is, and the less amplitude is. Electro-capillary oscillation at the interface between slag pool and metal pool does not exist with direct current eletroslag remelting. The behaviors of desulphurizing, deoxidizing and removing inclusion were analyzed. The desulphurizing and the removing inclusion of steel in alternate current electroslag furnace are better than that in direct current electroslag furnace.

关键词： ESR electro-capillary oscillation alternate current direct current

Hydrogen Pick-Up During Electroslag Remelting Process

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Journal of Iron and Steel Research International 2011年第4期18卷 19-23页

作者： JIANG Zhou-hua DONG Yan-wu liANG lian-ke li zheng-bang School of Materials and Metallurgy Northeastern University Shenyang 110004 Liaoning China Central Iron and Steel Research Institute Beijing 100081 China

The pick-up of hydrogen during electroslag remelting process for several slags consisting of CaF2-Al2O3-CaO-SiO2-MgO had been *** laboratory-scale remelting experiments had been carried out in open air and water-free argon atmosphere,and then the influencing factors were *** had been found that the hydrogen content in steel varied with different slag *** compositions and state of slag had significant effect on the hydrogen level in *** return slag and premelted slag could avoid the hydrogen pick-up especially in the early stages of the ***,premelted slag was the optimum state to control the hydrogen pick-up in *** results indicated that water-free argon atmosphere was very favorable to the control of hydrogen in steel in the normal remelting period.

关键词： electroslag remelting hydrogen calcium fluoride premelted slag protective atrriosphere