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Void Closure Behavior in Large Diameter Steel Rod during H-V Rolling Process

Journal of Iron and Steel Research International 2014年第3期21卷 287-294页

作者： Hua-gui HUANG Yong LIU feng-shan du Lei CHEN National Engineering Research Center for Equipment and Technology of Cold Strip Rolling Yanshan University

In order to reveal the mechanism and condition of void closure in large diameter steel rod during horizontal- vertical （H-V） groove rolling process, a three-dimensional thermomechanicaily coupled finite element model was es- tablished for 9-stand H-V groove rolling process aiming at a 4150 mm steel rod production line. A spherical hole with diameter from 2 to 10 mm was preset into the center of continuous casting billet with a rectangle cross section of 300 mmX 360 mm in this model to simulate the void defect, and then finite element analyses were carried out to observe and quantify the void shape evolution in each pass on the three orthogonal coordinate plane sections. The re- suits showed that the void was formed roughly in the reduction and extension directions, and crushed gradually from spherical shape to an approximate ellipsoid, micro-crack and finally to be closed. A quantitative analysis was carried out by using elliptic radii and closure ratio to describe this evolution process; it indicated that the longest axis of the ellipsoid coincided with the rolling line, and the second and third axes were alternatively ihorizontal and vertical on the exit cross section according to change of the reduction direction in H-V groove. The void closure behavior during H- V rolling was more complicated than that of common horizontal rolling, and the influence of groove type and the ex- tension coefficient on the void closure ratio was presented. Finally, a pilot rolling experiment was performed on a 5- stand H-V experimental mill to verify the numerical simulation results, and the experimental results are in good agree- ment with the numerical simulation results.

关键词： large diameter steel rod continuous casting billet H-V groove rolling~ void closure FEM

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Thermal-force control ability under variation of electromagnetic stick structure parameters in RPECT

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Journal of Iron and Steel Research International 2024年第1期31卷 224-236页

作者： Ting-song Yang Wen-quan Sun feng-shan du An-rui He Quan Yang National Engineering Research Center of Advanced Rolling and Intelligent Manufacturing University of Science and Technology BeijingBeijing100083China Institute of Engineering and Technology University of Science and Technology BeijingBeijing100083China College of Mechanical Engineering Yanshan UniversityQinhuangdao066004HebeiChina

Thermal-force driving of roll profile electromagnetic control technology(RPECT),which can be used to adjust the roll profile,can be affected by the sequential temperature rise between the electromagnetic stick(ES)and electromagnetic control *** to the limited space of ES and induction coil,the cross-sectional area of induction coil can be inevitably affected by changing the size of the ES induction zone,which can further change the energy input under the same electromagnetic parameters,the temperature rising effect and the bulging *** investigate this phenomenon,the effects of the radius of the induction zone on the thermal-force contribution ratio,the heating ability of ES and the temperature distribution were analyzed through an electromagnetic-thermal-structural finite element *** ensure that the results are applicable to RPECT,the thermal energy conversion ability and thermal-force roll crown control ability under different lengths of the induction zone were *** was found that whether the current density regulation mode or the current frequency regulation mode is adopted,the cases with 20 or 25 mm radius of the induction zone have the great thermal energy conversion ability and the good thermal-force roll crown control *** reasonable adjustment of the length of the induction zone can reduce the radius required for the maximum energy efficiency *** with the results of the simulation analysis,the optimization of ES based on the control ability maximization requirement is achieved,which provides the base for the design and configuration of ES in RPECT.

关键词： Roll profile electromagnetic control technology Electromagnetic stick Electromagnetic control roll Induction area Thermal-force driving

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Roll profile electromagnetic control characteristics under roll heterogeneity

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Journal of Iron and Steel Research International 2022年第12期29卷 1927-1938页

作者： Ting-song Yang Yu-hang Bai Yang Hai Qi-fa Chen feng-shan du National Engineering Research Center for Equipment and Technology of Cold Strip Rolling Yanshan UniversityQinhuangdao 066004HebeiChina College of Mechanical Engineering Yanshan UniversityQinhuangdao 066004HebeiChina

The electromagnetic control roll(ECR)and electromagnetic stick(ES)are the core elements and the main driving parts of roll profile electromagnetic control technology(RPECT).To prolong the service life,it is necessary to treat ECR and ES *** to the heterogeneous characteristics of surface treatments,the roll profile electromagnetic control characteristics were analyzed for different *** electromagnetic-thermal-force coupled axisymmetric finite element model was built to explore the differences in performance as a result of several treatment strategies,and the model was verified by experimental results measured with a roll profile electromagnetic control experimental *** model was used to analyze the influence of the heterogeneity of ECR inner hole and ES on the roll crown,the roll profile,the average contact pressure,and the stress state during RPECT *** results indicate that the heterogeneous layer at ECR inner hole has a restrictive effect on RPECT and that the heterogeneous layer of ES can enhance the profile control ability of RPECT.A reasonable configuration scheme between the heterogeneity of ECR inner hole and the ES can increase the life of ECR and maintain the control ability of RPECT.

关键词： Electromagnetic control roll Heterogeneous treatment Roll crown Roll profile electromagnetic control technology Electromagnetic stick

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Effect of Oscillation Parameters to Flow Field in the Pool during the Oscillating Twin-Roll Strip Casting Process

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Chinese Journal of Mechanical Engineering 2018年第6期31卷 187-194页

作者： Zhi-Qiang Xu Zhe-Ru Meng Shun-Hui Xue De-Quan Zhang feng-shan du School of Mechanical Engineering Yanshan University Qinhuangdao 066004 China National Engineering Research Center for Equipment and Technology of Cold Strip Rolling Yanshan University Qinhuangdao 066004 China shanghai XZS Heavy Machinery Integration Co. Ltd Shanghai 201900 China

during the oscillating twin?roll strip casting process, the quality of final products is directly influenced by the flow field distribution of molten metal in the pool. The variation in the flow field is caused by oscillating roller benefits, for homogeneous distribution of strip impurity, and decreasing the grain size. Thus, the quality of the strip could be improved. A numerical model was developed using the multiphase flow technology, coupled with heat transfer, fluid flow, solidification, and oscillation. Furthermore, a transient algorithm was adopted for simulating the oscillating twin?roll strip casting process of AlSi9Cu3 and 3104 aluminum alloy. This paper focuses on the flow distribution in the pool, in comparison with the traditional vertical twin?roll strip casting process, while the amplitude or frequency is chang?ing with the definite value of casting velocity, roller diameter, nozzle angle, and the strip thickness. Consequently, the conclusions were experimentally validated by oscillating twin?roll 3104 aluminum alloy strip casting. Vibrating casting technology can change the flow field in the pool by vibration, which can improve the quality of the strip core.

关键词： Flow field Oscillating twin?roll strip casting Solidification Twin?roll strip casting

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Evolution of bonding interface in solid-liquid cast-rolling bonding of Cu/Al clad strip

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Transactions of Nonferrous Metals Society of China 2017年第5期27卷 1019-1025页

作者： Hua-gui HUANG Yi-kang DONG Meng YAN feng-shan du National Engineering Research Center for Equipment and Technology of Cold Strip Rolling Yanshan University Qinhuangdao 066004 China

Cu/Al clad strips are prepared using solid?liquid cast-rolling bonding(SLCRB)technique with a d160mm×150mm twin-roll experimental *** extent of interfacial reactions,composition of the reaction products,and their micro-morphology evolution in the SLCRB process are investigated with scanning electron microscope(SEM),energy dispersive spectrometer(EDS),and X-ray diffraction(XRD).In the casting pool,initial aluminized coating is first generated on the copper strip surface,with the diffusion layer mainly consisting ofα(Al)+CuAl2and growing at high temperatures,with the maximum thickness of10μ*** sequent rolling below the kiss point,the diffusion layer is broken by severe elongation,which leads to an additional crack bond process with a fresh interface of virgin base *** average thickness is reduced from10to5μ*** reaction products,CuAl2,CuAl,and Cu9Al4,are dispersed along the rolling *** and bending test results indicate that the fracture occurs in the aluminum substrate,and the morphology is a dimple *** crack or separation is found at the bonding interface after90°-180°*** presented method provides an economical way to fabricate Cu/Al clad strip directly.

关键词： Cu/Al clad strip solid.liquid cast-rolling bonding bonding interface reaction diffusion peeling test

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Effect of order–disorder transition on thermodynamic and electronic properties of σ and χ phases in W–Re alloy: the first-principles calculation

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Tungsten 2025年第1期7卷 195-213页

作者： Zhi-Peng Zhu Dian Jia William Yi Wang Jun-Lei Yin Xing-Yu Gao Shu-feng Yang Hai-feng Song Jin-shan Li State Key Laboratory of Solidification Processing Northwestern Polytechnical University Laboratory of Computational Physics Institute of Applied Physics and Computational Mathematics School of Metallurgical and Ecological Engineering University of Science and Technology Beijing

The Tungsten-Rhenium(W-Re) alloys,celebrated for their high melting point,strength at elevated temperatures,electrical resistivity,and radiation resistance,have been widely utilized in high-temperature components,aerospace,electronics,and nuclear *** constituents of the topologically close-packed(TCP) phases,the sigma phase(σ) and chi phase(χ) formed within W-Re alloys wield considerable influence on the mechanical properties and the stability of the *** calculations were utilized in the present work to explore the structural,thermodynamic,and electronic properties of both ordered and disordered configurations within the σ and χ phases,culminating in a systematic elucidation of the higher phase stability exhibited by the ordered *** is found that the bulk modulus of these two phases is directly proportional to the concentration of Re in the alloy,while the equilibrium volume is inversely *** thermodynamic parameters of the σ and χ phases are calculated via the mean-field potential *** similar trends observed in the isobaric heat capacity,enthalpy increment,and entropy change curves for these two phases suggest they possess comparable thermodynamic *** is noteworthy that the contribution of ionic vibrations predominantly affects the isobaric heat capacity,while the contribution of thermal electronic excitations increases linearly with *** the structure and thermodynamic properties of TCP phases in W-Re alloys at low temperatures has profound significance for optimizing material performance,microstructures features,establishing theoretical foundations,and predicting material behavior.

关键词： First-principles calculations Phase stability TCP phases Thermodynamic properties W–Re alloy

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Spatiotemporal evolution of Ediacaran-Cambrian(ca. 551–523 Ma)sponges in South China and their simulated contributions to marine oxygenation

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Science China Earth Sciences 2025年

作者： Yan YE Lei ZHANG Can CHEN shan CHANG Yuhao YI Qinglai feng State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences(Wuhan) School of Earth Science China University of Geosciences(Wuhan) Department of Geology Lund University Institute of Sedimentary Geology Chengdu University of Technology Key Laboratory of Deep-time Geography and Environment Reconstruction and Applications of Ministry of Natural Resources Chengdu University of Technology Second Geological Brigade of Hubei Geological Bureau College of Urban and Environmental Sciences Hubei Normal University Exploration and Development Research Institute SINOPEC Jianghan Oilfield Company

The origin and evolution of sponges have attracted interest, not only because they are among the most basal metazoans, but also because they act as important ecological engineers in the ocean. Previous research suggested that sponge groups diversified quickly during the Cambrian Series 2, while Terreneuvian sponge fossils are conspicuously rare and poorly substantiated. Yet, an increasing number of sponge spicules have been reported from the Ediacaran-Cambrian(E-C, ca.551–523 Ma) transitional carbonates/cherts worldwide, particularly in South China, which calls for updated discussions. Ocean oxygenation has been widely proposed to play a critical role in organismal evolution, but its relationship with sponges is unclear and falls into a “chicken-egg” dilemma. In this study, we summarize reported sponge spicule distributions from five E-C sections in South China to investigate the early evolutionary pattern of siliceous sponges. According to current stratigraphic correlation,monaxons first appear in the late Ediacaran in the intrashelf basin-slope area, and then potentially expand to the continental shelf and deep basin in the lower Cambrian. In these sections, the abundance, size, and diversity of monaxons increase upwards,followed by the appearance of diaxons, triaxons and then polyactines. Despite the uncertain affinity of the sponge fossils, it is possible that siliceous hexactinellids evolved later than siliceous demosponges, given that the earliest spicule assemblages are exclusively composed of monaxons, which commonly form bundles comparable to modern demosponges. New geochemical data from the Sifangjing section, Guizhou Province and the Yanziqiao section, Hunan Province, South China show that the appearance of sponges usually corresponds to anoxic environment. In addition, we applied the recently proposed Biological Pump, Oxygen and Phosphorus(BPOP) model to trace the evolution of oceanic oxygen concentrations with the radiation of sponges. The results indic

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响应面法优化氧化石墨烯对Cr(Ⅵ)的吸附

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辽宁化工 2018年第3期47卷 199-201页

作者：李淼单凤君杜晓庆辽宁工业大学化学与环境工程学院辽宁锦州121001

为了提高氧化石墨烯(GO)处理含铬废水的处理效果,采用响应曲面法对氧化石墨烯(GO)吸附Cr(Ⅵ)进行优化。以氧化石墨烯(GO)浓度、吸附时间和Cr(Ⅵ)初始浓度为自变量,以Cr(Ⅵ)去除率为响应值,进行三因素三水平的响应面实验,通过建立的二次... 详细信息

为了提高氧化石墨烯(GO)处理含铬废水的处理效果,采用响应曲面法对氧化石墨烯(GO)吸附Cr(Ⅵ)进行优化。以氧化石墨烯(GO)浓度、吸附时间和Cr(Ⅵ)初始浓度为自变量,以Cr(Ⅵ)去除率为响应值,进行三因素三水平的响应面实验,通过建立的二次多项式数学模型,研究各因素对响应值的影响,通过3D Surface模型分析三因素对响应值的交互作用。结果表明,GO浓度为2.6 g/L、Cr(Ⅵ)初始浓度5 mg/L、吸附时间为90 min,Cr(Ⅵ)去除率为60%左右,与预测值和实测值接近,氧化石墨烯(GO)浓度和吸附时间交互作用对Cr(Ⅵ)去除效果影响较显著。

关键词：响应曲面法氧化石墨烯吸附优化含铬废水

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Effect of Oxide Scale on Interfacial Heat Transfer during Slab Hot Rolling

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Journal of Iron and Steel Research International 2002年第2期9卷 21-23页

作者： ZHOU Wei-hai du feng-shan Yanshan University

The environmental conditions in steel industry were discussed in detail. It was also pointed out that it was necessary to reduce the quantity of waste generated and discharged by improving the raw material, energy structure and consumption rate, and reinforcing the waste control and management. At the same time, the relevant mathematical models of environmental impact were set up on the basis of raw material consumption, energy consumption and waste generation and discharge in different technical routes of steelmaking. The result showed that the production route of DR iron clearly has more environmental advantages over that of BF hot metal.

关键词： iron steel production route environmental impact mathematical model

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Influence of Pass Parameters on Retained Mandrel Rolling Process

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Journal of Iron and Steel Research International 2011年第2期18卷 31-37页

作者： YU Hui du feng-shan XU Zhi-qiang College of Mechanical Engineering Yanshan University Qinhuangdao 066004 Hebei China

Roller pass is one of the key factors affecting the product quality in the retained mandrel rolling process. The metal flow condition of rolling deformation area was researched using the FEA （finite element analysis） software Marc. The influences of the pass bottom radius, the sidewall radius, the sidewall angle, the roller shoulder fillet radius, as well as the roller gap on the rolling process under the conditions of different friction were discussed. Based on these results, the changes of the workpiece exit width, the mandrel axial force, the rolling force, and the rolling torque associated with various parameters were determined, which would provide the basis for designing the pass and determining the rolling condition reasonably.

关键词： retained mandrel roller pass metal flow finite element analysis

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