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Gauge-meter model building based on the effect of elastic deformation of rolls in a plate mill

Journal of University of Science and technology Beijing 2007年第4期14卷 381-386页

作者： Xianlei Hu Zhaodong Wang Zhong Zhao Xianghua Liu Guodong Wang State Key Laboratory of Rolling Technology and Automation of Tandem Rolling Northeastern University Shenyang 110004 China

The calculation error of the gauge-meter model will affect the gap setting precision and the self-learn precision of rolling force. The precision of the gauge-meter model is strongly influenced by plate width, working roll radius, backup roll radius, working roll crown, backup roll crown, and rolling force. The influence rules are hard to get by measuring. Taking a conventional 4-h plate mill as the research subject, these influences were transferred into the calculation of roll deflection and flattening deformation. To calculate these deformations, the theory of the influence function method was adopted. By modifying the traditional gauge-meter model, a novel model of the effect of roll elastic deformation on the gap setting was built by data fitting. By this model, it was convenient to analyze the variation caused by the rolling condition. Combining the elastic deformation model of rolls with the kiss-rolls method, a gauge-meter model was put forward for plate thickness prediction. The prediction precision of thickness was greatly improved by the new gauge- meter model.

关键词： gauge meter influence function roll elastic deformation plate flattening

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A New Attempt to Obtain Bulk Nanocrystalline Steel

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Journal of Materials Science & technology 2009年第1期25卷 81-84页

作者： Shengjie Yao Linxiu Dut Xianghua Liu Guodong Wang The State Key Lab. of Rolling Technology and Automation Northeastern University Shenyang 110004 China

Bulk nanocrystalline steel sample was obtained in laboratory through refining of austenite grains and controlled rolling. Transmission electron microscopy micrographs show that some textures are evolved in the process of the treatment and two typical carbides are classified according to their size and location. The tensile strength of the nanocrystalline sample is obviously lower than conventional consideration, and scanning electron microscopy observation shows that the existence of the first type of carbide is considered as the main reason for the failure.

关键词： Bulk Nanocrystalline Deformation Carbide Fracture

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Dynamic Cascaded Flow-Shop Scheduling Using an Evolutionary Greedy Algorithm

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IEEE Transactions on Evolutionary Computation 2025年

作者： Li, Qiu-Ying Pan, Quan-Ke Wang, Ling Gao, Liang Li, Wei-Min Shanghai University School of Mechatronic Engineering and Automation Shanghai200072 China Tsinghua University Department of Automation Beijing100084 China Huazhong University of Science and Technology State Key Lab of Intelligent Manufacturing Equipment and Technology Wuhan430074 China Shanghai University School of Computer Engineering and Science Shanghai200000 China

Production processes are inherently complex, often involving multiple production phases from raw materials to finished products, making joint scheduling problems a focal point of research. This paper addresses the dynamic cascaded flowshop joint scheduling problem, which integrates a distributed permutation flowshop in Phase 1 and a hybrid flowshop in Phase 2. The challenge involves both initial scheduling and dynamic response mechanisms for new job insertions. We propose an evolutionary greedy algorithm (EGA) aimed at minimizing total flowtime. The EGA employs a multi-start cooperative framework tailored to problem characteristics, alternating between a population-based evolutionary greedy algorithm for Phase 1 and an elitist-based greedy algorithm for Phase 2 to generate a robust and complete schedule. Upon new job insertions, three heuristic-driven response strategies enhance solution stability and adaptability. Additionally, phase-specific hybrid local search operators and an adaptive insertion strategy, leveraging knowledge-based problem properties, further improve solution quality and search efficiency. The experimental results indicate that the EGA outperforms five state-of-the-art algorithms, achieving an average improvement of 39% in RPI values across 480 instances. Moreover, the proposed local search mechanisms and dynamic response strategies significantly enhance its performance. Thus, the EGA is well-suited for addressing the studied problem. © 1997-2012 IEEE.

关键词： Job shop scheduling

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Strain Rate-Dependent Cracking Behaviour in TWIP Steel During Nanoindentation: Role of Carbon and Deformation Twins

SSRN

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SSRN 2025年

作者： Zheng, J.P. Peng, X.X. Shang, X.K. Liang, Zhiyuan He, Binbin Department of Mechanical and Energy Engineering Southern University of Science and Technology Guangdong Province Shenzhen518055 China Songshan Lake Materials Laboratory Guangdong Province Dongguan523808 China State Key Laboratory of Rolling and Automation Northeastern University Liaoning Province Shenyang110819 China

High-performance twinning-induced plasticity (TWIP) steel containing interstitial carbon atoms demonstrates strain rate-dependent tensile behaviour with degraded ductility at low strain rates. The role of different defects, including carbon atoms and deformation twin boundaries in affecting this ductility degradation remains unclear. To elucidate the underlying mechanisms and consider the orientation-dependent formation of deformation twins, this study investigates the mechanical behaviour of single austenitic grain with either [001] or [110] orientations in a high-carbon Fe-Mn-C TWIP steel using nanoindentation under varying strain rates. For the first time, an interesting strain rate-dependent cracking behaviour is observed beneath the indentation impression of [001] austenitic grain with deformation twin boundaries. This crack occurs at low strain rate (10-3 s-1) but is absent at higher strain rates (10-1 s-1 and 10-2 s-1). Additionally, in [110] austenitic grains, no crack is observed at strain rate of 10-3 s-1, where deformation twin boundaries are absent. Coupling detailed transmission electron microscopy observation, finite element analysis and molecular dynamics simulation, the present work reveals that both carbon atoms and deformation twin boundaries play critical roles in initiating the crack nucleation. Specifically, at a low strain rate of 10⁻³ s⁻¹, carbon atoms pinning to mobile dislocations induce high localised stress. This localised stress was further amplified by dislocation pile-ups at twin boundaries, promoting crack nucleation and subsequent propagation through nanotwin bundles during further nanoindentation loading process. This study advances the understanding on the role of carbon atoms and deformation twin boundaries on the rate-dependent mechanical behavior of TWIP steels. © 2025, The Authors. All rights reserved.

关键词： Nanoindentation

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Characteristics of Retained Austenite in TRIP Steels with Bainitic Ferrite Matrix

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Journal of Wuhan University of technology(Materials Science) 2011年第6期26卷 1148-1151页

作者：张明亚 State Key Lab of Rolling and Automation Northeastern University

Heat treatment process for producing cold rolled transformation induced plasticity-aided （TRIP-aided） steels with bainitic ferrite matrix was adopted. Characteristics of retained austenite （RA） in such TRIP steels were investigated. SEM and OM determination results showed that the stable austenite retained at room temperature were mainly located between laths and some of them inside the coarse ferrite. The grains were uniformly distributed in heat treated steel matrix and the regularly dispersed RA represented to be triangular morphology. XRD analysis indicated that RA content in matrix was not less than 10%, and TEM testified that RA inside the matrix were formed at the prior austenite boundaries and represented to be single or twin crystals. The ductile fracture originated from the boundaries of martensite islands from RA and ferrite. The cracks propagated along grain boundaries and some passed through the large ferrite grains and induced transgranular fracture.

关键词： TRIP steel retained austenite morphology microstructure

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Effect of silicon on microstructure and wear properties of bainite high vanadium wear-resistant alloy

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Wear 2025年

作者： Xie, Hongshen Xu, Liujie Deng, Xiangtao Diao, Xiaogang Li, Zhou Wei, Shizhong National Joint Engineering Research Center for Abrasion Control and Molding of Metal Materials Henan University of Science and Technology Henan Luoyang471003 China State Key Laboratory of Rolling and Automation Northeastern University Shenyang110819 China Citic Luoyang Heavy Iron-Castings Company Ltd. Henan Luoyang471039 China

Silicon significantly affects the formation of carbide and nano-bainite structure, thus affecting the wear resistance of the alloys. To clarify the effect of silicon content on the microstructure and wear resistance of high vanadium wear-resistant alloys (HVWA), three silicon contents (0.66 wt%, 2.14 wt%, 5.17 wt%) were designed in HVWAs, and nano-bainite matrix was obtain through isothermal quenching process at low temperature. The vanadium carbides(VC) are distributed in nano-bainite matrix. The number of pellet/agglomerate VC in HVWAs increased and the number of strip/chrysanthemum VC decreased with increasing silicon content. The thickness of bainite ferrite strip and thin film retained austenite gradually decreases with the increase of silicon in the alloy, and the thickness of bainite ferrite strips in three alloys is 100–600 nm, 50–450 nm and 50–350 nm, respectively. When the silicon content is 2.14 wt%, the alloy has excellent comprehensive mechanical properties and wear resistance. Compared with other two alloys, the impact toughness of alloy with 2.14 wt% Si was improved by 10.2 % and 151.8 % respectively, and the wear weight loss was decreased by 35.4 % and 60.1 % under the conditions of 2.387 MPa wear load and 48 μm abrasive size. Due to a larger amount of high hardness pellet/agglomerate VC and significantly refined nano-bainite matrix which can efficiently resist abrasive scratches, the alloy with 2.14 wt% Si obtains superior toughness and wear resistance. © 2025 Elsevier B.V.

关键词： Silicon alloys

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Precipitation Behavior of Nb in Steel under Ultra Fast Cooling Conditions

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Journal of Wuhan University of technology(Materials Science) 2015年第2期30卷 375-379页

作者：周晓光 WANG Meng LIU Zhenyu YANG Hao WU Di WANG Guodong The State Key Laboratory of Rolling Technology and Automation Northeastern University

By measuring the expansion curves of a Nb bearing steel at different cooling rates by using Gleeble-3800 thermomechanical simulator, combining with metallographic analysis, different phase zones were determined. Also, precipitation behavior of Nb at different phase zones was investigated under ultra fast cooling conditions. The experimental results showed that adopting a proper deformation temperature, the ultra fast cooling process can restrain the precipitation of Nb at austenite phase zone. More quantities and smaller size precipitates of Nb can be found at the ferrite or bainite phase zone by controlling the ultra fast cooling ending temperature. With the increase of holding time at austenite, ferrite and bainite phase zones respectively, the volume fraction of precipitation, density, and average size of precipitates will increase obviously. With the decrease of early ultra fast cooling ending temperature, the density of Nb precipitates first increase（at ferrite phase zone） and then decrease（at bainite phase zone）, the volume fraction of Nb precipitation decreases and precipitates can be refined. The optimal early ultra fast cooling ending temperature is located at ferrite phase zone. The combination of high rolling temperature with early ultra fast cooling technology opens the way for new cooling schedules and makes the production of high strength steels easier and cheaper by making full use of Nb precipitation strengthening effect.

关键词： Nb bearing steel precipitation ultra fast cooling microstructure

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Analysis of Sheet Curvature in Asymmetrical Cold rolling

引用

Journal of Iron and Steel Research International 2013年第5期20卷 34-37页

作者： HAO Liang DI Hong-shuang GONG Dian-yao State Key Laboratory of Rolling Technology and Automation Northeastern University

In asymmetric cold rolling, the workpiece is often bent downwards or upwards. A two-dimensional explicit dynamic finite element model with Arbitrary Lagrangian Eulerian （ALE） adaptive meshing technique has been employed to simulate asymmetrical sheet rolling, in which asymmetrical conditions are here due to different roll radii. To validate the simulation, the results of simulation and experiment are compared. Effects of asymmetry due to roll radii mismatch on the normal and shear distributions and on sheet curvature variations are discussed. An optimum roll radii ratio could be found to produce flat sheet. Trials were conducted to investigate the effectiveness of roll radii mismatch as an approach of sheet curvature control.

关键词： asymmetrical rolling finite element method radii ratio sheet curvature

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Precipitation behavior of Ti in high strength steels

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Journal of Central South University 2017年第12期24卷 2767-2772页

作者： WU Si-wei LIU Zhen-yu ZHOU Xiao-guang YANG Hao WANG Guo-dong State Key Laboratory of Rolling Technology and Automation Northeastern University Shenyang 110819 China

Precipitation behavior of Ti in high strength steels was investigated by means of the equilibrium solid solubility theory. The contributions of Ti content to yield strength were calculated. The calculated results were verified by the hot rolling experiment for C–Mn steel and C–Mn–Ti micro alloyed steel, respectively. The research results show that the precipitates are mainly Ti N at the higher temperature. With the decreasing temperature, the proportion of Ti C in precipitates increases gradually. When the temperature drops to 800 °C, Ti C will become predominant for the precipitation of Ti. When Ti content is less than 0.014%(mass fraction), Ti has little influence on the yield strength. When Ti content is in the range of 0.014%–0.03%(mass fraction), the yield strength of Ti micro alloyed steel is greatly increased, which leads to instability of the mechanical properties of the steel. Therefore, the design of Ti content in high strength steels should avoid this Ti content range. When Ti content is higher than 0.03%, the yield strength increases stably. In this experiment, when added Ti content was controlled in the range of 0.03%–0.05%, the contribution to the yield strength of Ti micro alloyed steel can reach about 92.44 MPa.

关键词： precipitation strengthening solid solubility Ti(C, N) yield strength high strength steel

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Simulation of Fluid Flow, Heat Transfer and Micro-Segregation in Twin-roll Strip Casting of Stainless Steel

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Journal of Materials Science & technology 2006年第3期22卷 295-300页

作者： Xiaomin ZHANG Zhengyi JIANG Xianghua LIU Guodong WANG State Key Laboratory of Rolling Technology and Automation Northeastern University Shenyang 110004 China

In twin-roll strip casting process, metal flow and temperature distribution in the molten pool directly affect the stability of the process and the quality of products. In this paper, a 3D coupled thermal-flow fenite element modeling （FEM） simulation for twin-roll strip casting of stainless steel was performed. Influences of the pouring temperature and casting speed on the temperature fields were obtained from the numerical simulation. The micro-segregation of the solutes during the strip casting process of stainless steel was also simulated. A developed micro-segregation model was used to calculate the micro-segregation of solutes in twin-roll casting of stainless steel. The relationship between the solidus fraction in solidification and temperature was given, which was used to determine the LIT （liquid impermeable temperature）, ZST （zero strength temperature） and ZDT （zero ductility temperature） in the period of non-equilibrium solidification. The effect of temperature on the micro-segregation was discussed. According to the computational results, the solidification completion temperature in the twin-roll strip casting of stainless steel was then determined, which can provide a basis for controlling the location of solidification completion temperature and analysing the crack of the casting strip.

关键词： Casting speed Micro-segregation Twin-roll strip casting Simulation

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