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Journal of Iron and Steel Research International 2022年第11期29卷 1771-1788页

作者： Jing-shi Zhang Wen-tao Lou miao-yong Zhu Key Laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education) Northeastern UniversityShenyang 110819LiaoningChina School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina

A cold model of top-bottom blown converter was set up to study the particle transport phenomenon and vibration performance of converter with bottom powder *** effect of bottom blowing flow rates,tuyere diameters,arrangements,and powder to gas mass ratios on powder distribution and furnace body vibration was *** results show that the bottom injection parameters and modes have significant effects on the particle transport behavior and furnace *** powder dispersion uniformity and furnace vibration increase with the increase in bottom blowing tuyere *** the lower range of bottom blowing flow rates and powder to gas mass ratios,the powder dispersion uniformity is improved with the increase in ***,in the higher range,the excessive furnace vibration leads to reduction in uniformity in powder *** the bottom blowing tuyeres arrange at double arrangement of 0.5R(R refers to the radius of the bottom)distance between tuyere and center of bath bottom,the converter has optimal particle transport behavior and vibration *** vibration law of converter with bottom powder injection was revealed by deducing the empirical formulas of furnace vibration maximum *** vibration intensity is affected by Froude number,powder to gas mass ratio,and tuyere arrangement.

关键词： Converter steelmaking Bottom powder injection Powder dispersion uniformity Furnace vibration Physical modelling

Optimization of flow control devices in a tenstrand billet caster tundish

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China Foundry 2016年第6期13卷 414-421页

作者： Shu-guo Zheng miao-yong Zhu School of Metallurgy Northeastern University

The physical model of a ten-strand billet caster tundish was established to study the effects of various flow control devices on the melt flow. Before and after the optimization of the melt flow, the inclusion removal in the tundish was evaluated by plant trials. The physical modeling results show that when combined with a baffle, the turbulence inhibitor, instead of the impact pad, can significantly improve the melt flow. A turbulence inhibitor with a longer length of inner cavity and without an extending lip at the top of the sidewall seems to be efficient in the improvement of the melt flow. Various types and designs of baffles all influence the flow characteristics significantly. The "V" type baffles are better than the straight baffles for flow control. The "V" type baffle with four inclined holes at the sidewall away from the stopper rods is better in melt flow control than the one with one inclined hole at each sidewall. The combination of a well-designed turbulence inhibitor and an appropriate baffle shows high efficiency on improving the melt flow and an optimal proposal was presented. Plant trials indicate that, compared with the original tundish configuration in prototype, the inclusions reduce by 42% and the inclusion distribution of individual strands is more similar with the optimal one. The optimal tundish configuration effectively improves the melt flow in the ten-strand billet caster tundish.

关键词： billet continuous casting ten-strand caster tundish flow control device physical modeling plant trials

Effect of Subcritical Annealing Temperature on Microstructure and Mechanical Properties of SCM435 Steel

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Journal of Iron and Steel Research International 2015年第11期22卷 1031-1036页

作者： Cheng JI Lei WANG miao-yong ZHU School of Materials and Metallurgy Northeastern University

The effect of subcritical annealing temperature on microstructure and mechanical properties of SCM435 steel was investigated through changing the heating and soaking temperature as 660 °C, 680 °C, 700 °C, 720 °C and 745 °C. The microstructure and mechanical properties of intercritically annealed specimens were analyzed. With increasing the subcritical annealing temperature from 660 °C to 720 °C, the spheroidization ratio gradually increased, and the mechanical properties, formability and Vickers hardness were improved. According to the comprehensive comparison of mechanical properties and formability, the subcritical process at soaking temperature of 680-720 °C could achieve similar annealing effect as that of intercritical process. Therefore, the subcritical annealing temperature could be set as 700 °C in practice, with the Ac1 temperature fluctuation within ±20 °C, and the applicability and stability of subcritical annealing were guaranteed in industrial application. The plant results of the cold heading showed that the subcritical annealing could replace original intercritical annealing successfully with significantly saving time and energy.

关键词： subcritical annealing spheroidization ratio SCM435 steel microstructure mechanical property formability

Numerical Simulation of Fluid Flow and Heat Transfer in Funnel Shaped Mold of Thin Slab Continuous Caster

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Journal of Iron and Steel Research International 2005年第6期12卷 14-19页

作者： ZHU miao-yong WANG Jun ZHANG Ying Northeastern University Shenyang 110004 China

Thin slab casting is used widely in the world. The control of molten steel flow and solidification in the mold is difficult due to the high casting speed and complicated configuration of the mold. Numerical simulation was carried out to study the fluid flow and heat transfer in the funnel shaped mold. The influence of nozzle design, casting speed and nozzle submersion depth on the flow and temperature fields in the mold was investigated, and guidance for selecting configurations of submerged nozzle was obtained.

关键词： thin slab continuous casting fluid flow heat transfer numerical simulation

Study on the separation process of non-metallic inclusions at the steel-slag interface using water modeling

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International Journal of Minerals,Metallurgy and Materials 2017年第6期24卷 627-637页

作者： Ye-lian Zhou Zhi-yin Deng miao-yong Zhu School of Metallurgy Northeastern University Shenyang 110819 China Key Laboratory for Ecological Utilization of Multimetallic Mineral of the Ministry of Education Shenyang 110819 China

The separation process of non-metallic inclusions at the steel–slag interface was simulated by physical modeling. Three different kinds of particles (octahedral, plate-like, and spherical) and three different oils (kerosene, bean oil, and pump oil) were used to model inclusions and slags, respectively. The effects of inclusion geometry (shape and size) and slag properties (viscosity and interfacial tension) on the separation process were investigated. The results revealed that the variation of surface free energy and the viscosity of the slag are two significant factors affecting the separation process of inclusions at the steel–slag interface. The variation of surface free energy helped inclusions enter the slag phase, whereas the decrease of slag viscosity shortened the separation time. The deformation of the steel–slag interface could give rise to the resistance force, which would resist inclusions passing through the interface. A liquid film formed on the inclusion as it passed through the steel–slag interface, which might be related to the inclusion’s shape. © 2017, University of Science and Technology Beijing and Springer-Verlag Berlin Heidelberg.

关键词： Free energy Interfaces (materials) Kerosene Liquid films Separation Viscosity

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基于数字孪生的桥梁拆除施工安全控制技术

湖北工业大学学报 2024年第1期39卷 116-120页

作者：苗勇邹贻权裴尧尧湖北工业大学土木建筑与环境学院湖北武汉430068

大型桥梁进行拆除重建过程中存在大量的安全问题,针对桥梁拆除施工安全控制问题,提出了基于数字孪生的桥梁拆除施工安全控制技术;综合应用物联网、BIM、WEBGL、5G通信、人工智能等技术,最终形成一个实时可视化的对桥梁拆除运输进行自动... 详细信息

大型桥梁进行拆除重建过程中存在大量的安全问题,针对桥梁拆除施工安全控制问题,提出了基于数字孪生的桥梁拆除施工安全控制技术;综合应用物联网、BIM、WEBGL、5G通信、人工智能等技术,最终形成一个实时可视化的对桥梁拆除运输进行自动化控制的数字孪生系统,系统的应用验证了该技术的可行性以及实用性,保证了桥梁拆除施工的安全性,为桥梁拆除施工安全控制提供了一个新的方法。

关键词：桥梁拆除数字孪生实时监测施工控制

Influence of TiO2 on the melting property and viscosity of Cr-containing high-Ti melting slag

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International Journal of Minerals,Metallurgy and Materials 2020年第3期27卷 310-318页

作者： Jing Ma Gui-qin Fu Wei Li miao-yong Zhu School of Metallurgy Northeastern University

A study on the melting and viscosity properties of the chromium-containing high-titanium melting slag(CaO–SiO2–MgO–Al2O3–TiO2–Cr2O3) with TiO2 contents ranging from 38.63 wt% to 42.63 wt% was conducted. The melting properties were investigated with a meltingpoint apparatus, and viscosity was measured using the rotating cylinder method. The FactSage 7.1 software and X-ray diffraction, in combination with scanning electron microscopy–energy-dispersive spectroscopy(SEM–EDS), were used to characterize the phase equilibrium and microstructure of chromium-containing high-titanium melting slags. The results indicated that an increase in the TiO2 content led to a decrease in the viscosity of the chromium-containing high-titanium melting slag. In addition, the softening temperature, hemispheric temperature, and flowing temperature decreased with increasing TiO2 content. The amount of crystallized anosovite and sphene phases gradually increased with increasing TiO2 content, whereas the amount of perovskite phase decreased. SEM observations revealed that the distribution of the anosovite phase was dominantly influenced by TiO2.

关键词： titanium dioxide Cr-containing high-titanium melting slag melting property viscosity vanadium titanomagnetite

Dynamic Soft Reduction for Continuously Cast Rail Bloom

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Journal of Iron and Steel Research International 2007年第5期14卷 13-17,51页

作者： CHEN yong LI Gui-jun YANG Su-bo ZHU miao-yong School of Materials and Metallurgy Northeastern University Shenyang 110004 Liaoning China Department of Material Research Panzhihua Iron and Steel Research Institute Panzhihua 617000 Sichuan China Vanadium Recovery andSteelmaking Plant Panzhihua New Steel and Vanadium Co Ltd Panzhihua 617062 Sichuan China

Center porosity and centerline segregation in continuously cast bloom can be minimized by the well-known method of dynamic soft reduction. Metallurgical results of soft reduction previously employed in continuous bloom casting for heavy rail steel in Panzhihua Iron and Steel Group were not fully achieved because of the improper soft reduction process. Therefore, experiments for optimizing the process parameters of soft reduction for bloom were carried out. The results show that the proportion of the center porosity, which is less than 1.0, increases from 28.41% to 99.81%, while the proportion of the centerline segregation class increases from 40.91% to 100%, and the proportion of the central cavity increases from 92.05% to 100%, whereas the center carbon segregation index decreases from 1.17 to 1.05. The internal quality and the mechanical performance of the rails produced from continuously cast blooms meet the requirement of high-speed tracks of 350 km/h.

关键词： continuous bloom casting dynamic soft reduction rail steel internal quality

Control Model of Bloom Dynamic Soft Reduction

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Journal of Iron and Steel Research International 2010年第9期17卷 31-35页

作者： CHEN yong JI Cheng ZHU miao-yong WU Guo-rong Department of Material Research Panzhihua Iron and Steel Research Institute Panzhihua 617000 Sichuan China School of Materials and Metallurgy Northeastern University Shenyang 110004 Liaoning China

There are significant effects of process parameters on internal qualities of bloom, and these process parameters are as follows. position and reduction amount, reduction distribution, reduction rate, and so on. Developing a control model is the key to apply soft reduction technology successfully. As the research object, 360 mm ×450 mm bloom caster in PISCO （Panzhihua Iron and Steel Co. ） has been studied, and the research method for control model of dynamic soft reduction has been proposed. On the basis of solidification and heat transfer model, the position of soft reduction and reduction distribution of each frame are determined according to the bloom temperature distribution and solid fraction in bloom center calculated. Production practice shows that the ratio of center porosity which is less than or equal to 1.0, increased to 97.27%, ratio of central segregation which is less than or equal to 0.5, increased to 80.91%, and ratio of central carbon segregation index which is more than or equal to 1.10, decreased to 4% with the applying model of dynamic soft reduction.

关键词： bloom continuous casting dynamic soft reduction control model center porosity central segregation

Interfacial Fluctuation Behavior of Steel/Slag in Medium-Thin Slab Continuous Casting Mold With Argon Gas Injection

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Journal of Iron and Steel Research International 2010年第4期17卷 5-11页

作者： YU Hai-qi ZHU miao-yong WANG Jun School of Materials and Metallurgy Northeastern University Shenyang 110004 Liaoning China Anshan Iron and Steel Co Anshan 114009 Liaoning China

The flow field of molten steel and the interfacial behaviour between molten steel and liquid slag layer in medium-thin slab continuous casting mold with argon gas injection were studied by numerical simulation, in which the effects of nozzle submergence depth and port angle, casting speed, and argon gas flow rate on the flow and the level fluctuation of molten steel were considered. The results show that the molten steel is jetted from the submerged en- try nozzle （SEN） with three ports into the mold and forms three recirculation zones including one upper recireulation zone and two lower recirculation zones. Argon gas injection results in a secondary vortex flow in the upper zone near the nozzle. For a given casting speed and argon gas flow rate, increasing the side port angle and submergence depth of nozzle can effectively restrain the steel/slag interracial fluctuation. Increasing the casting speed would prick up the level fluctuation. For a fixed casting speed, argon gas flow rate has a critical value, the interracial fluctuation with argon gas injection are stronger than the case without argon gas injection when the argon gas flow rate is less than the critical value, but when the argon gas flow rate exceeds the critical value, the level fluctuation is calmer than that without argon gas injection.

关键词： medium-thin slab mold argon gas injection steel/slag interface numerical simulation