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Optimization of Holding Temperature and Holding Thickness for Controlled Rolling on Plate Mill

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Journal of Iron and Steel Research International 2006年第3期13卷 21-25页

作者： HU Xian-lei ZHAO Zhong WANG Jun WANG Zhao-dong LIU Xiang-hua WANG guo-dong State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China

Holding temperature and holding thickness are main parameters for two-phase controlled rolling on plate mill. The optimization of holding temperature and holding thickness for pass schedule calculation of two-phase controlled rolling on plate mill was presented and its feature is as follows：（1） Determination of holding thickness can be automatically obtained based on the influence of mill safety limits, tracking zone length and holding time on holding thickness; （2） Determination of holding temperature can be automatically obtained and the holding time can be reduced as much as possible; （3） Algorithm can modify the holding temperature and thickness depending on slab size and product size.

关键词： plate two-phase controlled rolling pass schedule holding temperature holding thickness

Cardiopulmonary bypass induced microcirculatory injury of the small bowel in rats

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World Journal of Gastroenterology 2009年第25期15卷 3166-3172页

作者： guo-hua dong Chang-Tian Wang Yun Li Biao Xu Jian-Jun Qian Hai-Wei Wu hua Jing Department of Cardiothoracic Surgery Jinling Hospital Clinical Medicine School of Nanjing University Nanjing 210002 Jiangsu Province China

AIM： To investigate microvascular injury quantitatively in the small bowel with respect to cardiopulmonary bypass （CPB） and related mechanisms. METHODS： In 10 male SD rats, normothermic CPB was established and continued with a flow rate of 100-150 mL/kg per minute for 60 min, while another 10 sham-operated animals served as controls. An approximate 10-cm loop of the terminal ileum was exteriorized for observation by means of intravital fluorescence microscopy. The small bowel microcirculatory network including arterioles, capillaries, and collecting venules was observed prior to CPB, CPB 30 min, CPB 60 min, post-CPB 60 min and post-CPB 120 rain. The intestinal capillary perfusion, microvascular permeability and leukocyte adherence were also measured. RESULTS： The systemic hemodynamics remained stable throughout the experiment in both groups. In CPB animals, significant arteriolar vasoconstriction, blood velocity reduction and functional capillary density diminution were found. As concomitances, exaggerated albumin extravasation and increased leukocyte accumulation were also noted. These changes were more pronounced and there were no signs of restitution at the end of the observation period. CONCLUSION： CPB induces significant microcirculatory injury of the small bowel in rats. The major underlying mechanisms are blood flow redistribution and generalized inflammatory response associated with CPB.

关键词： Cardiopulmonary bypass Functional capillary density Intestinal microcirculation Intravital microscopy

Inhibitory effect of H_(3+x)PMo_(12-x)V_xO_(40)-Ton the self-polymerization of methyl methacrylate

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Chinese Chemical Letters 2016年第4期27卷 613-618页

作者： Yan-Bing Yin Hui-Song Wang Yu-Lin Yang Rui-Qing Fan guo-hua dong Li-guo Wei College of Chemistry and Chemical Engineering Qiqihar University Qiqihar 161006 China Department of Chemistry Harbin Institute of Technology Harbin 150001 China College of Environmental and Chemical Engineering Heilongjiang University of Science and Technology Harbin 150022 China

In this work,a series of molybdovanadophosphoric heteropoly acid quaternary ammonium salts H_（3＋x）PMo_（12 -x）V_xO40-T were synthesized and employed as a reaction inhibitor in the selfpolymerization of methyl methacrylate（MMA）.The polymerization inhibition effect of H_（3＋x）PMoPMo_（12 -x）V_xO40-T）with different number of vanadium atoms and reaction dosages was investigated using differential scanning calorimetry（DSC）.It shows that the inhibitory effect was improved with the increasing dosages of H_（3＋x）PMoPMo_（12 -x）V_xO40-T）,and the polymerization inhibition was also affected by the number of vanadium atoms in the H_（3＋x）PMo_（12 -x）V_xO40-T .Furthermore,cyclic voltammograms（CV）was used to probe the mechanism of the inhibition reaction with H3＋*** result of CV indicates that the inhibition reaction is an oxidation–reduction reaction.H_（3＋x）PMo_（12 -x）V_xO40-T can react directly with the MMA monomer radicals,which eliminated the MMA monomers,and therefore the self-polymerization of the MMA can be effectively inhibited by H_（3＋x）PMo_（12 -x）V_xO40-T.

关键词： Molybdovanadophosphoric heteropoly acid Quaternary ammonium salt Methyl methacrylate Differential scanning calorimetry Cyclic voltammograms Inhibition effect

Austenite Recrystallization and Controlled Rolling of Low Carbon Steels

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Journal of Iron and Steel Research International 2006年第3期13卷 31-35,50页

作者： DU Lin-xiu ZHANG Zhong-ping SHE Guang-fu LIU Xiang-hua WANG guo-dong State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China

The dynamic recrystallization and static recrystallization in a low carbon steel were investigated through single-pass and double-pass experiments. The results indicate that as the deformation temperature increases and the strain rate decreases, the shape of the stress-strain curve is changed from dynamic recovery shape to dynamic recrystallization shape. The austenite could not recrystallize within a few seconds after deformation at temperature below 900 ℃. According to the change in microstructure during deformation, the controlled rolling of low carbon steel can be divided into four stages： dynamic recrystallization, dynamic recovery, strain-induced ferrite transformation, and rolling in two-phase region. According to the microstructure after deformation, the controlled rolling of low carbon steel can be divided into five regions： non-recrystallized austenite, partly-recrystallized austenite, fully-recrystallized austenite, austenite to ferrite transformation, and dual phase.

关键词： recrystallization low carbon steel austenite strain-induced transformation controlled rolling

Calculation of Taper Rolling Time in Plan View Pattern Control Process

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Journal of Iron and Steel Research International 2006年第5期13卷 1-3页

作者： JIAO Zhi-jie HU Xian-lei ZHAO Zhong LIU Xiang-hua WANG guo-dong State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China

The forward slip model with adhesion was used to derive the formula of calculating taper rolling time. The relation between the rolling time and the taper length and the relation between the rolling time and the taper thickness can be obtained. The numerical solution for this formula was used on site. According to the simulation result, the roll gap value should be changed linearly with rolling time.

关键词： plan view pattern control forward slip model taper time calculation

Derivation of Simplified Models of Plan View Pattern Control Function for Plate Mill

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Journal of Iron and Steel Research International 2007年第4期14卷 20-23页

作者： JIAO Zhi-jie HU Xian-lei ZHAO Zhong LIU Xiang-hua WANG guo-dong State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China

The plan view pattern control theoretical models were simplified. Under the condition of constant volume for the plan view pattern compensation, the relation between the thickness and the length can be simplified to the linearity in the segment for the plan view pattern control function. The compensation volume can be dispersed for easy calculation. By comparing the model calculation result with the actual result, it was concluded that the simplified model can be used for the online control process.

关键词： plan view pattern control theoretical model simplified model

Derivation of Plastic Specific Work Rate for Equal Area Yield Criterion and Its Application to Rolling

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Journal of Iron and Steel Research International 2010年第4期17卷 34-38页

作者： ZHAO De-wen FANG Qi LI Can-ming LIU Xiang-hua WANG guo-dong State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China

On the basis of the analysis of the hexagons inscribed and circumscribed of the Mises yield circle on the π- plane in Haigh Westergaard stress space, a new equation called equal area linear yield criterion or EA criterion was proposed, and its plastic specific work rate was derived. Then, a generalized worked example of plate rolling was analyzed by the criterion and its corresponding plastic specific work rate. Finally, the precision of the solution was compared with measured roll separation force in plate finish rolling process. It indicates that the calculated results by EA criterion are slightly higher than the measured ones.

关键词： EA yield criterion specific work rate finish rolling analytical solution

Forward and Backward Slip Models in MAS Rolling Process and Its On-Line Application

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Journal of Iron and Steel Research International 2007年第4期14卷 15-19页

作者： HU Xian-lei JIAO Zhi-jie HE Chun-yu LIU Xiang-hua WANG guo-dong State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China

Based on the MAS rolling process in plate mill, the mathematical models of forward and backward slips of the wedges at plate head and tail were derived. According to the new model, the difference between the forward slip of the wedge and that of the normal part of the plate is obviously very small. The deviation is less than 2.5 % in general. Thus, in actual application, the forward slip of normal part of the plate can be used to calculate the length of rolled plate instead of the derived model. The rationality of this simplified method was confirmed with the application in Shougang 3 500 mm plate mill. The test results showed that the wedges of plate head and tail are symmetrical. The plate width deviation is greatly decreased by using the MAS method.

关键词： MAS plate forward slip backforward slip wedge

Application of Geometric Midline Yield Criterion for Strip Drawing

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Journal of Iron and Steel Research International 2009年第6期16卷 13-16页

作者： WANG Gen-ji DU Hai-jun ZHAO De-wen LIU Xiang-hua WANG guo-dong State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China

A new linear yield criterion expressed by the geometric midline of error triangle between Tresca and Twin shear stress yield loci on the π-plane in Haigh-Westergaard space was introduced. The criterion was written in terms of the values of principal stress deviator and called GM yield criterion for short. Together with a Cartesian coordinate velocity field instead of the Avitzur＇s, the GM criterion was used to obtain an analytical solution for strip drawing. With a working example of the strip drawing through wedge-shaped die, the results of relative drawing stress calculated by the GM criterion were compared with those calculated by Mises＇ criterion from Avitzur formula. It indicated that the calculated results according to analytical solution were in good agreement with the numerical solution obtained from Avitzur formula.

关键词： GM yield criterion strip drawing analytical solution