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Mechanical Property and Microstructural Characterization of C-Mn-Al-Si Hot Dip Galvanizing TRIP Steel

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Journal of Iron and Steel research International 2012年第8期19卷 29-36页

作者： JIANG Hai-tao1, DING Wei1,2, TANG Di1, HUANG Wei1 (1. national engineering research center for advanced rolling Technology, University of Science and Technology Beijing, Beijing 100083, China 2. School of Material and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia, China) [a] national engineering research center for advanced rolling Technology University of Science and Technology Beijing Beijing 100083 China [b] School of Material and Metallurgy Inner Mongolia University of Science and Technology Baotou 014010 Inner Mongolia China

Mechanical properties and microstructure in high strength hot dip galvanizing TRIP steel were investigated by optical microscope (OM), transmission electron microscope (TEM), X-ray diffraction (XRD), dilatometry and mechanical testing. On the heat treatment process of different intercritical annealing (IA) temperatures, isothermal bainitic transformation (IBT) temperatures and IBT time, this steel shows excellent mechanical properties with tensile strength over 780 MPa and elongation more than 22%. IBT time is a crucial factor in determining the mechanical properties as it confirms the bainite transformation process, as well as the microstructure of the steel. The microstructure of the hot dip galvanizing TRIP steel consisted of ferrite, bainite, retained austenite and martensite during the short IBT time. The contents of ferrite, bainite, retained austenite and martensite with different IBT time were calculated. The results showed that when IBT time increased from 20 to 60 s, the volume of bainite increased from 14.31% to 16.95% and the volume of retained austenite increased from 13.64% to 16.28%; meanwhile, the volume of martensite decreased from 7.18% to 1.89%. Both the transformation induced plasticity of retained austenite and the hardening of martensite are effective, especially, the latter plays a dominant role in the steel containing 7.18% martensite which shows similar strength characteristics as dual-phase steel, but a better elongation. When martensite volume decreases to 1.89%, the steel shows typical mechanical properties of TRIP, as so small amount of martensite has no obvious effect on the mechanical properties.

关键词： TRIP steel isothermal bainitic transformation martensite mechanical property

Condition Monitoring and Fault-tolerant Control for Level 2 Control System of Hot rolling

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Condition Monitoring and Fault-tolerant Control for Level 2 ...

Asymmetric Shape Control Theory and Practice in Hot Strip Mills and Cold Strip Mills

第十届国际轧钢大会

作者： Song Yong Jing Fengwei LIN Fengqin (national engineering research center for advanced rolling Technology University of Science and Technology Beijing China)

＜正＞A method for online monitoring level 2 control system of hot rolling is *** can online analyze and assess health state,model precision and control performance of the control system by data sieving,real-time collecting and statistically analyzing the characteristic *** can help maintenance model engineers to analyze the influential factors of abnormal control precision,using of data mining,analysis of condition differences and other *** some measurement data are abnormal,fault-tolerant control method is used to minimize effect on model prediction precision and self-learning function and to improve the adaptability of level 2 control system of hot rolling.

关键词： hot rolling process automation mathematical model fault diagnosis fault-tolerant control

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Asymmetric Shape Control Theory and Practice in Hot Strip Mi...

New Generation Automatic Control System of Hot wide Strip Mills

第十届国际轧钢大会

作者： Yang Quan He Anrui Shao Jian Du Xiaozhong Wang Xiaochen Sun Wenquan Liu Tianwu Zhang Yun (national engineering research center of Flat rolling Equipment national engineering research center of advanced rolling University of Science & Technology Beijing Beijing 100083 China)

＜正＞In hot rolling and cold rolling process,asymmetric shape defects are still common problems to strip *** the mills with inverse symmetry roll shifting system,different wear and thermal contour of top roll system and bottom roll system could cause asymmetric profile and flatness defects during shifting *** this paper,three dimension finite element simulation models of inverse shifting roll system were established to calculate the parameters and to analyze the *** on the idea in the mill engineering that mill style option depended on the product grade,shifting weakness was evaluated and the model of asymmetric control theory with the opinion of limited shifting was *** improve control effect to wedge and asymmetric flatness defects in hot rolling and cold rolling,the separate bending of drive side and operating side was *** reduce the asymmetric edge drops in cold rolling,the single taper work roll shifting was proposed,the further improvement of asymmetric shape control theory and practice is the key way to reach the higher precision of shape quality in hot and cold strip mills.

关键词： hot strip mill cold strip mill shifting mill inverse symmetry roll system asymmetric shape defect separate bending limited shifting asymmetric shape control system

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New Generation Automatic Control System of Hot wide Strip Mi...

Online application of automatic surface quality inspection system to finishing line of cold rolled strips

Asia Steel International Conference 2012(Asia Steel 2012)

作者： HE An-rui SONG Yong SHAO Jian Jing Feng-wei GUO Qiang (national engineering research center for advanced rolling Technology USTB Beijing 100083 China)

＜正＞Automation control system is the key common technology of hot continuous rolling of wide strip,It has great influence on the product quality,production stability and yield *** main hardware configuration includes TDC and PLC controller in the basic automation system,PC servers in the process control *** network structure and communication solution of automation control system for hot wide strip mills was also *** advanced automatic control functions were represented in detail,such as profile and flatness control,setup schedule calculation, AGC sub-system,finishing temperature control and coiling temperature *** functions are very important and *** all include several sub-functions ***,the profile and flatness control is realized by special work roll and backup roll contour,profile and flatness control *** improvement of mathematical models, shape control,special steel rolling and system maintenance were summarized *** automatic control system has been used on 10 hot strip rolling production lines and perfect performances were achieved in debugging time,product quality, yield rate,adaptability,extensibility,etc.

关键词： hot strip mills control system setup model profile and flatness

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Journal of University of Science and Technology Beijing 2003年第4期10卷 38-41页

作者： Hao Sun, Ke Xu, and Jinwu Xunational engineering research center of advanced rolling, University of Science and Technology Beijing, Beijing 100083, China national engineering research center of advanced rolling. University of Science and Technology Beijing Beijing 100083 China

An automatic surface quality inspection system installed on a finishing lineof cold rolled strips is introduced. The system is able to detect surface defects on cold rolledstrips, such as scratches, coil breaks, rusts, roll imprints, and so on. Multiple CCD area scancameras were equipped to capture images of strip surface simultaneously. Defects were detectedthrough 'Dark-field illumination' which is generated by LED illuminators. Parallel computationtechnique and fast processing algorithms were developed for real-time data processing. Theapplication to the production line shows that the system is able to detect defects effectively.

关键词： surface inspection cold rolled strip finishing line CCD cameras imageprocessing

Optimization of Pass Schedule in Hot Strip rolling

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Journal of Iron and Steel research International 2012年第8期19卷 25-28页

作者： QI Xiang-dong, WANG Tao, XIAO Hong (national engineering research center for Equipment and Technology of Cold Strip rolling, Yanshan University, Qinhuangdao 066004, Hebei, China) national engineering research center for Equipment and Technology of Cold Strip rolling Yanshan University Qinhuangdao 066004 Hebei China

rolling schedule not only determines the rolling process to be going smoothly, but also affects the shape accuracy and structure properties of finished strip. In order to gain good strip crown and flatness, the calculation formulas of the most suitable rolling force and bending force are deduced. By taking relatively equal load of rolling power and good shape as objective functions, the optimization mathematical models of finish rolling schedule are established. By contrast, the rolling schedules after optimization can improve the rolling mill working status and ensure the strip crown and flatness to be good. At the same time, the setting value of bending force is improved and this leaves more space for on-line shape control.

关键词： optimization rolling schedule rolling force bending force shape

Development of Rapidly Quenched Soft Magnetic Materials in China

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Journal of Materials Science & Technology 2000年第2期16卷 131-136页

作者： Shaoxiong ZHOU (national Amorphous and Nanocrystalline Alloy engineering research center, Central Iron and Steel research Institute, Beijing 100081, China) national Amorphous and Nanocrystalline Alloy engineering research center Central Iron and Steel Research Institute Beijing 100081 China

The discovery of the first Fe-based ferromagnetic amorphous alloy in 1966 had made an impact on conventional magnetic materials because of its unique properties. Since then, a number of amorphous magnetic materials have been successfully developed and used in a wide variety of applications. A brief review of R & D activities on amorphous soft magnetic materials in China is given from the beginning to the present in a somewhat chronological order, followed by a brief introduction to their applications on electric and electronic industries. An analysis and a prospect of Chinese market of such amorphous materials are also presented.

关键词： Development of Rapidly Quenched Soft Magnetic Materials in China

Microsegregation and Improved Methods of Squeeze Casting 2024 Aluminium Alloy

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Journal of Materials Science & Technology 2003年第5期19卷 413-416页

作者： Yong ZHONG, Guoyue SU and Ke YANGThe national engineering research center, the Institute of Metal research, Chinese Academy of Sciences, Shenyang 110016, China Natl. Eng. Res. Ctr. Inst. of Metal Res. Chinese Acad. of Sci. Shenyang 110016 China

The squeeze casting of a 2024 Al alloy was carried out to investigate the effect on microsegregation in the alloy of the application of pressure followed by diffusion annealing. The experimental results indicate that an optimum applied pressure followed by an optimum diffusion annealing process can markedly reduce the degree of microsegregation and improve the mechanical properties to a degree that can approach the level of forged 2024 Al alloy.

关键词： 2024 Al alloy Squeeze casting Microsegregation Diffusion annealing

Providing personalized converged services based on flexible network reconfiguration

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Science China(Information Sciences) 2011年第2期54卷 334-347页

作者： HU YuXiang, LAN JuLong & WU JiangXing national Digital Switching System engineering and Technological research center, Zhengzhou 450002, China 1. national Digital Switching System engineering and Technological research center Zhengzhou 450002 China

Recent developments show a progressing convergence of networks, services, and applications, which results in the necessity for new approaches to provide a ubiquitous experience on converged networks for specialized high data-rate services. A fundamental diversifying attribute for the future physical network convergence paradigm is pressing. In this paper, we make researches on converged resource reconfiguration model of substrate physical network based on hardware virtualization and provide a service oriented network architecture as a network convergence primitive. Based on the idea of hardware virtualization which is performed by platform deformation and component processing with reconfiguration (here, they are realized as reconfigurable routers (RR)), the substrate converged network, which inter-connects various access networks by reconfigurable routers, could be mapped into multiplex service oriented logical networks, supports dynamic reconfiguration due to diversified quality of services under heterogeneous environment, and therefore provides more flexible and high- speed multiple services. In addition, to demonstrate the generality of our model, we provide a prototype of reconfigurable router. The design, implementation and task scheduling as well as both hardware and software reconfiguration process of reconfigurable router are discussed in detail. Our evaluation shows that reconfigurable router is transparent for upper service-providing networks and results in little performance impact on the service delivery when both hardware and software reconfiguration are used.

关键词： network convergence hardware virtualization resource reconfiguration reconfigurable router