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| 1 | Numerical and physical simulation of a twin-roll strip caster显示文摘The 1:1 water model of a twin-roll strip caster was set up based on the Froude number and the Reynolds number similarity criteria. A new type metal delivery system was designed for the twin-roll strip caster. The level fluctuation and the fluid flow in the pool of the water model were measured using the level detector and the 3D-LDV (laser Doppler velocimetry) technology. It is shown that a wedged delivery system can produce the desirable level fluctuation and even fluid flow distribution in the pool. Numerical simulations for the water model were performed. Comparisons between the numerical and physical simulation results show good agreement near the side dams. | Bo Wang Jieyu Zhang Yin Zhang Youduo He Junfei Fan Yuan Fang Shengli An | 2006 | Journal of University of Science and Technology Beijing2006，13，5： | 7 |
| 2 | Enhanced Answer Selection in CQA Using Multi-Dimensional Features Combination显示文摘Community Question Answering(CQA) in web forums, as a classic forum for user communication,provides a large number of high-quality useful answers in comparison with traditional question answering.Development of methods to get good, honest answers according to user questions is a challenging task in natural language processing. Many answers are not associated with the actual problem or shift the subjects,and this usually occurs in relatively long answers. In this paper, we enhance answer selection in CQA using multidimensional feature combination and similarity order. We make full use of the information in answers to questions to determine the similarity between questions and answers, and use the text-based description of the answer to determine whether it is a reasonable one. Our work includes two subtasks:(a) classifying answers as good, bad, or potentially associated with a question, and(b) answering YES/NO based on a list of all answers to a question. The experimental results show that our approach is significantly more efficient than the baseline model, and its overall ranking is relatively high in comparison with that of other models. | Hongjie Fan Zhiyi Ma Hongqiang Li Dongsheng Wang Junfei Liu | 2019 | Tsinghua Science and Technology2019，24，3： | 2 |
| 3 | Mathematical modeling of fluid flow and level profile during twin-roll strip casting process显示文摘In twin-roll strip casting process,transport phenomena of fluid in the molten pool directly affect the process stability and the quality of products.In order to elucidate the fundamental transport phenomena in twin-roll casting,a commercial software called ProCAST was employed to simulate the transient fluid flow and level profile behaviors during the early stage of the process in this study.The coupled set of governing differential equations for mass,momentum and energy balance were solved with the finite element method and the transient free surface problem was treated with a volume of fluids(VOF) approach.The effect of different delivery systems configuration on flow pattern,level profile in the pool was studied and analyzed in this paper. The new wedge metal delivery systems have been optimized for the twin-roll strip caster.It was shown that new type metal delivery systems had a preferable effect on the uniform distribution of fluid and level fluctuation in the pool.The simulation results also provide a valuable basis for the optimization of delivery system and process parameters during the initial pouring stage. | ZHANG Weidong~(1)),ZHANG Jieyu~(1)),WANG Bo~(1,2)),REN Sanbing~(3)), FAN Junfei~(3)),FANG Yuan~(3)) and YU Yan~(3)) 1) School of Material Science and Engineering,Shanghai University,Shanghai 200072,China 2) Material and Metallurgical School,Inner Mongolia University of Science and Technology,Baotou 014010,China 3) Research Institute,Baoshan Iron and Steel Co.,Ltd.,Shanghai,201900,China | 2010 | Baosteel Technical Research2010，4，S1： | 1 |
| 4 | Experimental and mathematical modeling of metal spray forming process显示文摘The metal spray forming process was examined using mathematical simulation and verified through the prototyping evaluation at Baosteel's test and development facilities.The mathematical model comprised of four sections,including jet gas flow in the deposition chamber;single droplet behavior along its trajectory path;probability and statistical analysis of droplet mass behavior,and forecast of the shape and temperature distribution of the billet during the spray forming process. | ZHANG Yin FAN Junfei REN Sanbin | 2011 | Baosteel Technical Research2011，5，3： | 1 |
| 5 | Microstructure and forming characteristics of spray-formed M42 high speed steel显示文摘M42 high speed steel(HSS),a high grade alloy,was produced using the spray forming technology.Optical metallography(OM),X-ray diffraction(XRD) and scanning electron microscope(SEM) were used to investigate the microstructures of the as-sprayed M42 HSS and the as-atomized powders.It is found that as-sprayed M42 HSS is composed of martensite,retained austenite and carbides.The grain size,as well as the morphology,size and distribution of the carbides have been greatly improved compared with those of the as-cast M42 steel(a traditional process).The size of the powder obtained at a high cold speed was ranged from 50 μm to 100 μm in diameter.Its representative microstructures include dendrite,dendritic fragments,a mixture of dendrites,equiaxed grains and dendritic fragments,and equiaxed grains.The rapid solidification in the spray forming is a key factor to cause the refinement of the M42 HSS. | ZHAO Shunli FAN Junfei MA Chao ZHOU Candong | 2011 | Baosteel Technical Research2011，5，3： | 1 |
| 6 | Study of influence of ladle condition on molten steel during strip casting显示文摘A model of the heat transfer between molten steel and the ladle lining was established for the strip casting process,which involves a series of different operations. These operations include preheating,ladle tapping,ladle waiting,blowing of argon gas,and ladle pouring. To simulate the process of pouring molten steel,the geometric deformation( moving grid) technique was used in the model. Moreover,the model considers the heat absorption effect of argon gas and the formation of open eyes during argon blowing. Note that the model was used to compare the effect of different parameter values,including different preheating temperatures,tapping temperature,and argon blowing rates. The results indicate that the argon blowing rate has considerable influence on the decrease in the temperature of molten steel. | REN Sanbing FAN Junfei FANG Yuan | 2019 | Baosteel Technical Research2019，13，2： | 1 |
| 7 | Development and application of model for predicting molten metal temperature in continuous casting process显示文摘An unsteady mathematical thermal model was developed for predicting the time,molten-steel weight,induction heating power,and temperature changes of the steel from the end of ladle refining to the end of the continuous-casting process of a tundish. The calculations revealed that for a specific strip-casting process,the ladle tonnage should be controlled to about 90 t. If the ladle capacity reaches 130 t,the provision of a 1 500-kW tundish induction heating device is recommended. By comparing the measured and predicted molten-steel temperature values in the Ningbosteel-Baosteel strip casting industrialization demo project( NBS) of a tundish,it was determined that the prediction accuracy of the model could meet the forecasting accuracy requirements for the molten-steel temperature in the tundish during mass production. Simultaneously,the heat flux density on each surface of the tundish was found at about 50 min,which is entirely consistent with the values reported in the related literature,and the tundish had not reached a heat balance during the casting test period. This model can also be applied to calculate the suitable size of a tundish for a specific continuous-casting process,thereby providing a theoretical basis for the design of the continuous-casting tundish. | FAN Junfei REN Sanbing FANG Yuan ZHOU Jiangang QIN Bo | 2019 | Baosteel Technical Research2019，13，2： | 0 |
| 8 | The numerical simulation of the movements and thermal states of atomized metal droplets in the spray forming process显示文摘Numerical simulation was performed in an atomizing chamber to investigate the movements and thermal states of the atomized metal droplets in the spray forming process.The velocity,temperature and solid fractions of metal droplets with different diameters and under different atomizing pressures were investigated.The results indicate that a higher atomizing pressure results in the increased flying velocity of the metal droplets and a decrease in the cone-shaped angle formed by their flight paths.Synchronously,the cooling of the metal droplets is accelerated and the time of the complete solidification process is shortened.Under the same atomization pressure,large metal droplets have a lower flying speed and a lower rate of temperature decrease in the atomizing chamber than small metal droplets.In addition,metal droplets flying along the edge of the atomizing region cool faster than those flying in the core region. | YUAN Feng FAN Junfei REN Sanbing LE Hairong ZHAO Shunli | 2009 | Baosteel Technical Research2009，3，2： | 0 |
| 9 | Numerical modeling of influence of thermal flow coupling on flow characteristics of molten steel显示文摘Using the equation of continuity and the double equation of Navier-Stokes and k-ε,numerical modeling on a single outlet continuous casting tundish has been carried out during the process of non-thermal flow coupling.The flow field distribution inside the tundish was calculated and the viscosity response time was calculated with the mass transfer equation based on the flow field distribution.The flow characteristics of the molten steel inside the tundish were analyzed,with the results of the numerical modeling compared to the hydraulic modeling.The results showed that the Resident Time Distribution(RTD)curves in the latter anatomosed comparatively better.This certified the validity established by the mathematical model.Numerical modeling was carried out on both large and small tundishes during the processes of thermal flow coupling and also thermal non-flow coupling.The results showed that in regards to large tundishes with relatively simple flow processes,using numerical modeling for thermal flow coupling is necessary. | Fan Junfei Ren Sanbing Chen Yaxian Zhao Shunli Huang Zongze Zhu Miaoyong | 2008 | Baosteel Technical Research2008，2，1： | 0 |
| 10 | Numerical modeling of blow refining process of a 300t ladle furnace at Baosteel显示文摘Targeting the single tuyere and double tuyere methods of argon blowing for Baosteel's 300 t ladle furnace, the 3D continuity equation,the N-S equation and the turbulent k-εdouble-equation were used to model the form of the molten steel flow and the dead areas under six different argon blowing conditions.The different flow field forms and the degree of mixing under different argon blowing methods were compared.The results demonstrate that when large ladles are operated via different methods of argon blowing,the spray from the centre of a single tuyere forms a symmetrical vortex,while when a double tuyere sprays,there is basically no clear vortex.In regards to the amount of argon blowing that will produce the best blend of molten steel,the amount of dead area reduction will not be clearly noticeable if there is an excessive argon blowing amount. | Ren Sanbing Fan Junfei Huang Zongze Zhao Shunli Chen Yisheng | 2008 | Baosteel Technical Research2008，2，1： | 0 |
| 11 | Investigation into microstructure of spray formed V4 cold working mould steel and its roiling and annealing显示文摘The material selected for this work was the spray formed Vanadis4 high alloy cold working mould steel (abbreviated to V4 steel).Its microstructure,hot rolling process,and annealing treatment have been investigated. Observed from the optical and electron microscopes,the as-sprayed V4 steel had the finer microstructure of uniform and equiaxial grains,while after hot rolling for densification and spheroidized annealing,the V4 steel obtained an excellent spheroidized structure that is favorable to subsequent quenching and tempering treatment.The spheroidized structure and level of annealed hardness of the V4 steel are almost the same as expensive imported powder metallurgy the V4 steel.It is difficult to produce V4 steel with the conventional ingot metallurgical technique,so the multi-step and high-cost powder metallurgy method is generally used at present.Compared to the powder metallurgy technique,using the spray forming technique to produce the V4 steel has obvious advantages and potential market competitiveness in reducing production costs,simplifying working process,and shortening the production cycle. | Shi Haisheng Yan Fei Fan Junfei Le Hairong fin Binzhong Peng Yong | 2008 | Baosteel Technical Research2008，2，1： | 0 |
| 12 | Numerical simulation of the liquid steel flow and solidification phenomena in the slab continuous casting process显示文摘A 3D coupling mathematical simulation program of the fluid flow,thermal transfer and solidification was developed based on the slab continuous casting process.Some characteristics such as fluid flow,solidification and temperature distribution near the submerged entry nozzle (SEN) and the corner of the mold were simulated and analyzed.The result of the calculation indicates that the flow of molten metal forms two big cycling zones in the mold after it flows out of the SEN,and the temperature at the center of the two zones is relatively low.Moreover,there is a small narrow cycling zone near the narrow side of the mold due to casting.The velocity of the surface flow,the turbulent kinetic energy and the F value might reveal the relationship between the fluctuation of meniscus and the quality of the slab to some degree. | FAN Junfei SHEN Jianguo ZHI Jianjun REN Sanbing ZHAO Shunli ZHANG Yin ZHANG Jieyu HE Youduo | 2009 | Baosteel Technical Research2009，3，1： | 0 |
| 13 | Hydraulic simulation of the feeding system in the strip casting process显示文摘A 1∶1 water model of a twin-roll strip caster was set up based on the Froude number(Fr) and Reynolds number(Re) similarity criteria.Fluctuation and the mixing effect in the molten pool of twin-roll strip casting process were analyzed through hydraulic simulation.The height of the fluctuation of the liquid pool surface and the residence time were measured by DJ800 multifunctional monitor under different process conditions.The results show that the casting velocity,the insertion depth and the pool level have a great effect on the fluctuation. | REN Sanbing DU Feng ZHAO Shunli FAN Junfei FANG Yuan ZHANG Jieyu | 2009 | Baosteel Technical Research2009，3，1： | 0 |
| 14 | Preface显示文摘Spray forming,also known as spray casting,spray deposition and in-situ compaction,is a method of materials prepartion,forming and machining based on powder metallurgy. | FAN Junfei | 2011 | Baosteel Technical Research2011，5，3： | 0 |
| 15 | The development of China's special steel and the application prospects of spray-formed materials显示文摘Suggestions have been put forward speeding up the development of high-level tool steel and mold steel in China based on the analysis of products and development status of special steel home and abroad.Feasibility and necessity to produce high-level tool steel and mold steel by applying the spray forming method in future have been put forward. | FAN Junfei ZHAO Shunli REN Sanbing MA Chao | 2011 | Baosteel Technical Research2011，5，3： | 0 |
| 16 | Numerical simulation of tube profile growth during spray forming process显示文摘Spray forming is a new type of metal material forming process,which can produce metal blanks such as billet,tube,plate etc.A mathematical model has been developed to forecast the shape evolution of tube billets during the spray forming process.The atomizer mass flux as,radial distribution coefficient bs,draw velocity and diameter of mandrel were considered in this model and the influence of different parameters such as metal flowrate,draw velocity of mandrel,diameter of mandrel on the tube's shape change were simulated and analyzed in this paper.The simulation results obtained from this model can be provided to engineers as reference. | REN Sanbing FAN Junfei LE Hairong | 2011 | Baosteel Technical Research2011，5，3： | 0 |
| 17 | Microstructure of the spray formed Vanadis4 cold work die steel and its evolution during hot rolling and heat treatment显示文摘A high alloyed Vanadis4(V4) steel was produced by spray forming process in Baosteel,and the microstructure of the as-sprayed steel and its evolution during hot rolling and annealing processes were characterized.It was found that the as-sprayed V4 steel has a homogeneous and fine scale microstructure with uniform dispersion of carbides.The hot rolling temperature is the key factor in controlling the evolution of type,morphology and distribution of carbides,as well as the matrix microstructure of the as-rolled steels.The optimized processing parameters for the as-sprayed V4 steel are rolling at 1 050℃ and then annealing at 900℃.The microstructural evolution mechanisms during hot rolling and annealing are determined according to the microstructural analyasis of the material at different stages. | SHI Haisheng YAN Fei FAN Junfei LE Hairong JIN Bingzhong | 2011 | Baosteel Technical Research2011，5，3： | 0 |
| 18 | Microstructure characteristics of spray-formed high vanadium and cobalt high speed steel显示文摘The microstructure of high vanadium and cobalt high speed steel(high-V/Co HSS) and the morphology of its carbides were analyzed by optical microscope(OM),scanning electron microscope(SEM),electron probe microanalysis(EPMA),X-ray power diffraction(XRD),atomic force microscopy(AFM) and single phase erosion(SPE).The results suggest that the as-sprayed high-V/Co HSS has fine equiaxed grains(about 20 μm in size),which were homogeneously distributed.The carbides have two classical morphologies:one is fine particles(about 2 μm in size) distributed along the grain boundaries and the other is needle-like one,distributed on the grain boundaries.There are MC carbides,M2C carbides,M6C carbides and Cr2WC2 carbides in the as-sprayed high-V/Co HSS samples,however,in the as-cast high-V/Co HSS,there are MC carbides and Cr2WC2 carbides only.The SPE results show that there are two types of MC carbides in the as-sprayed HSS:the sphere one and the particle-like one.The former is about 2 μm in size and the latter is less than 1 μm,dispersed inside the grains,quite different from the MC carbides in the as-cast HSS.According to the AFM results,the skeleton-like M6C carbides of the as-sprayed high-V/Co HSS are embedded in the matrix along the grain boundaries.It is found that there are sharp membrane pieces on the carbides.Some small bamboo-shoot-like MC carbides grow from the matrix and are dispersed inside the grain.Those larger MC carbides are spherical particles embedded at the grain boundary junctions. | ZHOU Candong LE Hairong FAN JunFei REN Sanbing ZHAO Shunli | 2011 | Baosteel Technical Research2011，5，3： | 0 |
| 19 | A study on mathematical simulation of spray forming process显示文摘An integrated approach for modeling the entire spray forming process is presented in this paper,and the program for the simulation is developed.The whole spray forming process can be divided into four calculation processes and the basis for the analysis is the classical k-εturbulence model which was used to simulate the flow field of gas formed in the chamber.In the atomization model the flow field of gas is coupled with formation,velocity and location of droplet.By means of the above mathematical model,the process of spray forming was simulated. | Junfei Fan Yin Zhang Sanbing Ren Hairong Le Shunli Zhao Youduo He | 2007 | Baosteel Technical Research2007，1，1： | 0 |
| 20 | Simulation of meniscus fluctuations in the feeding system used in strip casting显示文摘The feeding system used in the strip casting process delivers molten metal from the tundish to the pool that is bordered by side dams and rolls and is one of the key units in the production of high quality strip metal. The traditional method for studying this key unit is to use a combination of a water model and a mathematical model.However,the relations in the model with and without roll rotation have not been clearly revealed in previous studies. A 2 D transient model based on a continuity equation,momentum equation,turbulent equations,and a VOF equation was established in this study and used to simulate the meniscus fluctuation. A half model with a structured grid was used for the reported simulation. The simulation showed that significant differences existed in the fluctuation in the flowfields and wave length with or without the roll rotation. The wave fluctuation exhibited uncertainty and an unstable character in the roll rotation condition. The level fluctuation employing different process parameters such as rotating speed and immersion depth of tip angle was simulated and compared with and without roll rotation. The study results showed that the meniscus fluctuation of twin-roll strip casting was primarily affected by the roll rotation,and the level fluctuation increased with the increase in rotation velocity and decreased with immersion depth. | REN Sanbing FAN Junfei | 2017 | Baosteel Technical Research2017，11，3： | 0 |
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