2004年, 第11卷, 第1期　刊出日期：2004-01-25

  

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  Corrosion Resistance of MgO-C Based Refractory to Slag Containing Titania

  LIU Qing-cai, SUN Ya-li, DU Yun-gui, CHEN Deng-fu

  钢铁研究学报（英文版）. 2004, 11(1): 1-4.

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  The interaction between the slag containing titanium oxides (TiO₂ of 2. 0%—20. 0%) and a MgO-C based refractory was investigated by immersion test. The relationship between TiO₂ content in slag and corrosion rate of the refractory was studied. The microstructure and compositions of the corroded refractory were analyzed by SEM and X-ray diffraction. The corrosion mechanism of MgO-C based refractory in the slag containing titanium was proposed, and the effects of TiO₂ content, slag basicity (ѡ_Cao/ѡ_SiO2) and temperature in molten bath on the corrosion rate of the refractory were obtained.
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  Decarburization of Fe-C Melt by Pressured Oxygen

  JIANG Guo-chang, LU Xiong-gang, LU Li-ming, CHEN Jian-xiong, DING Wei-zhong, CHOU Kuo-chi, XU Kuang-di

  钢铁研究学报（英文版）. 2004, 11(1): 5-8.

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  From thermodynamics and kinetics principles, the reason of accelerated decarburization and temperature rising of Fe-C melt in a reactor in which gas is pressured by oxygen was described.
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  Flow Field of Metallic Fluid Acted by Electromagnetic and Centrifugal Force

  QIU Yi-qing, LUO Zong-an, JIA Guang-lin, LIU Xiang-hua, WANG Guo-dong

  钢铁研究学报（英文版）. 2004, 11(1): 9-11.

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  According to the principle of electromagnetism and hydrodynamics, a mathematical model of flow field for metallic fluid acted by electromagnetic and centrifugal forces was established. The calculation results showed that the relative velocity between metallic fluid layers rises and the absolute rotational velocity of metallic fluid falls with the increase of magnetic in-duction intensity. The increase of centrifugal revolution hardly affects the relative velocity between metallic fluid layers, but can enhance the absolute rotational velocity of metallic fluid.
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  Hybrid Neural Network Model for RH Vacuum Refining Process Control

  ZHANG Chun-xia, WANG Bao-jun, ZHOU Shi-guang, LIU Liu, XU Jing-bo, LIN Li-ping, ZHANG Cheng-fu

  钢铁研究学报（英文版）. 2004, 11(1): 12-16.

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  A hybrid neural network model, in which RH process (theoretical)model is combined organically with neural network (NN)and case-base reasoning (CBR), was established. The CBR method was used to select the operation mode and the RH operational guide parameters for different steel grades according to the initial conditions of molten steel, and a three-layer BP neural network was adopted to deal with nonlinear factors for improving and compensating the limitations of technological model for RH process control and end point prediction. It was verified that the hybrid neural network is effective for improving the precision and calculation efficiency of the model.
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  Wear and Thermal Stress Analysis of Side Dam for Twin Roll Strip Casting

  LI Chao-feng, DI Hong-shuang, ZHANG Xiao-ming, WANG Guo-dong, LIU Xiang-hua

  钢铁研究学报（英文版）. 2004, 11(1): 17-21.

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  The side dam technology for twin roll strip casting was discussed. The effect of preheating temperature, material and design of side dam on the process stability and surface quality of products was analyzed. The wear and erosion of side dam for different steel grades were described. Two types of side dam designs, namely integral type and combined type, were used in the experiment, and the suitable position of side dam was determined by experiment. The results show that the combined side dam is better than the integral one in process stability and long service life. The temperature fields and thermal stress fields in side dam during strip cast-ing were analyzed using the finite element analysis software, and the causes of side dam crack-ing were explained.
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  FEM Calculation of Work Roll Temperature and Thermal Crown

  KONG Xiang-wei, XU Jian-zhong, YE He-zhou, WANG Guo-dong, LIU Xiang-hua, HE Xiao-ming, BA Liying

  钢铁研究学报（英文版）. 2004, 11(1): 22-25.

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  The simulation of the work roll temperature field was carried out by means of AN-SYS software, and the thermal crown of the roll along its axis was obtained. The thermal structural coupled element and contact element were introduced. In the simulation of work roll temperature field, the convert boundary condition and the transient thermal contact between the roll and strip were studied. Besides, the dynamic variation of the work roll temperature and the transient temperature distribution of the work roll during hot rolling were investigated. The calculated results were in good agreement with the measured data.
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  Optimization of Heat Flux Coefficient Determination for Laminar Cooling Control

  CAI Xiao-hui, LUO Zong-an, WANG Guo-dong, LIU Xiang-hua

  钢铁研究学报（英文版）. 2004, 11(1): 26-28.

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  A new heat flux coefficient model and improved refreshing rules were introduced for optimizing coiling temperature model. The off-line simulation of the new strategy was per-formed by laminar cooling intelligent software, and the on-line application shows that the control of coiling temperature has been improved significantly.
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  Shape Discrimination Analysis of Rolled Strip Based on Strip Element Method

  PENG Yan, CHU Yu-peng, LIU Hong-min

  钢铁研究学报（英文版）. 2004, 11(1): 29-32.

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  The rolled strip was divided into a number of strip elements, and the deflection function model was constructed with the third-power spline function and the sine function. Using the minimum potential energy principle, the shape discrimination was transformed into the solution of characteristic values. The influence of different elements on the shape stability of rolled strip was discussed.
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  Slab Storage Calculation Method for Continuous Casting-Hot Rolling

  PENG Qi-chun, LIU Qing, TIAN Nai-yuan

  钢铁研究学报（英文版）. 2004, 11(1): 33-36.

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  Based on load-oriented manufacturing control theory, different combining modes and slab storage calculation method for continuous casting and hot rolling were discussed. The buff-er capacity index of continuous casting-rolling was introduced, and the reasonable slab storage under different combining modes was calculated with buffer capacity index of 120. 00 h for CCR, 79. 20 h for HCR, 19. 68 h for DHCR and 3. 84h for DR. Thin slab is 1. 20h, and the strip is zero. Theory gist was provided for steel enterprise to decrease storage.
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  Microstructure and Property of High Carbonic-Chromium Cast Steel with Different Hot Deformation Ratio

  XU Tao, WANG Jiu-liang, ZHANG Run-jun, , CHAO Guo-hua, LIU Jian-hua

  钢铁研究学报（英文版）. 2004, 11(1): 37-41.

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  The microstructure and properties of high carbonic-chromium cast steel subjected to different hot deformation ratios were studied. The experimental results show that the micro-structure and properties of high carbonic-chromium cast steel are obviously improved after hot deformation, and the best mechanical properties of the cast steel can be obtained under hot deformation ratio of 40%—50%, which leads to the morphology change of eutectic carbide and the precipitation of granular carbides.
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  Interaction of Hydrogen and Retained Austenite in Bainite/Martensite Dual-Phase High Strength Steel

  GU Jia-lin, CHANG Kai-di, FANG Hong-sheng, YANG Zhi-gang, BAI Bing-zhe

  钢铁研究学报（英文版）. 2004, 11(1): 42-46.

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  The hydrogen trapping phenomena in two bainite/martensite dual-phase high strength steels (U20Si and U20DSi) were investigated by electrochemical permeation technique. The hydrogen diffusivity was calculated from data of permeation delay time, and the diffusion coefficient in U20Si is far less than that in U20DSi. Moreover, the hydrogen diffusivity decreases as the volume percent of retained austenite increases. The experiment results show that there are different hydrogen trappings and different volume percents of retained austenite in U20Si and U20DSi. The retained austenite is precipitated as films. The trap binding energy for the retained austenite and hydrogen is calculated to be 40. 4 kJ·mol^-1.
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  Morphological Change and Its Mechanism of Eutectic Silicon for Strontium-Modified Alloy A357

  GUO Jian-ting, DU Xing-hao

  钢铁研究学报（英文版）. 2004, 11(1): 47-51.

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  The microstructure evolution for alloy A357 modified by original Al-10Sr alloy was systematically investigated. The results show that the eutectic silicon phase becomes finer and more homogeneous with the increase of strontium concentration and modifying temperature. The mechanism of microstructure evolution was also investigated by TEM observation.
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  Y₂O₃-CeO₂-ZrO₂ Powder Prepared by Co-Precipitation and As-Plasma-Sprayed Coating

  SHAO Gang-qin, ZHANG Wen-xi, HOU Zhong-tao, YUAN Run-zhang

  钢铁研究学报（英文版）. 2004, 11(1): 52-57.

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  The Y₂O₃-CeO₂-ZrO₂ powders were prepared using a co-precipitation process and the corresponding coatings were prepared by plasma spraying. The results show that an optimal composition exists in Y₂O₃-doped CeO₂-ZrO₂, but not in CeO₂-doped Y₂O₃-ZrO₂. The powders mainly contain tetragonal phase and a trace amount of monoclinic phase. The homogeneity in composition, large agglomerate size, ideal particle size distribution and high flowability were obtained. The as-sprayed coatings are composed of non-transformable tetragonal phase, tz' structure, and resistant to transformation under thermal or mechanical stresses.
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  Characteristic of Bond Zone between Powder Surfacing Layer and Base Metal

  SHAN Ji-guo, ZHANG Di, REN Jia-lie, CHEN Bo-li

  钢铁研究学报（英文版）. 2004, 11(1): 58-62.

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  The characteristic of the bond zone between Ni-based alloy light beam surfacing layer (SL) and base metal (BM) was investigated by scanning electron microscope, energy dispersive spectrometer and X-ray diffraction. The results show that the bond zone, which consists of γ-Ni or γ-(Fe, Ni) planar crystal band close to SL and α-Fe bright band close to heat affected zone (HAZ), is actually the transition zone of composition and microstructure between SL and HAZ, and the metallurgical bond interface lies between the α-Fe bright band and HAZ. With the increase of light beam heat input from 2 kJ/mm to 4 kJ/mm, the width of the bond zone increases from 4μm to 15μm, and the morphology of bond interface changes from zigzag to straight. The formation of bond interface indicates the formation of reliable metallurgical bond between SL and BM.