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Case-Based Reasoning(CBR) Model for Ultra-Fast Cooling in Plate Mill

Chinese Journal of Mechanical Engineering 2014年第6期27卷 1264-1271页

作者： HU Xiao wang zhaodong wang Guodong State Key Laboratory of Rolling and Automation Northeastern University

New generation thermo-mechanical control process（TMCP） based on ultra-fast cooling is being widely adopted in plate mill to product high-performance steel material at low cost. Ultra-fast cooling system is complex because of optimizing the temperature control error generated by heat transfer mathematical model and process parameters. In order to simplify the system and improve the temperature control precision in ultra-fast cooling process, several existing models of case-based reasoning（CBR） model are reviewed. Combining with ultra-fast cooling process, a developed R5 CBR model is proposed, which mainly improves the case representation, similarity relation and retrieval module. Certainty factor is defined in semantics memory unit of plate case which provides not only internal data reliability but also product performance reliability. Similarity relation is improved by defined power index similarity membership function. Retrieval process is simplified and retrieval efficiency is improved apparently by windmill retrieval algorithm. The proposed CBR model is used for predicting the case of cooling strategy and its capability is superior to traditional process model. In order to perform comprehensive investigations on ultra-fast cooling process, different steel plates are considered for the experiment. The validation experiment and industrial production of proposed CBR model are carried out, which demonstrated that finish cooling temperature（FCT） error is controlled within±25℃ and quality rate of product is more than 97%. The proposed CBR model can simplify ultra-fast cooling system and give quality performance for steel product.

关键词： ultra-fast cooling plate mill case-based reasoning case representation similarity relation retrieval module

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On the Microstructural Strengthening and Toughening of Heat-Affected Zone in a Low-Carbon High-Strength Cu-Bearing Steel

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Acta Metallurgica Sinica(English Letters) 2021年第5期34卷 617-627页

作者： Xiaohui Xi Jinliang wang Liqing Chen zhaodong wang State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang110819China

In this article,the influence of simulated thermal cycles for the heat-aff ected zone(HAZ)on the microstructural evolution and mechanical properties in a low-carbon high-strength Cu-bearing steel was investigated by microstructural characterization and mechanical *** results showed that the microstructure of the coarse-grained heat-aff ected zone(CGHAZ)and the fine-grained heat-aff ected zone(FGHAZ)was mainly comprised of lath martensite,and a mixed microstructure consisting of intercritical ferrite,tempered martensite and retained austenite occurred in the intercritically heat-aff ected zone(ICHAZ)and the subcritically heat-aff ected zone(SCHAZ).Also,8–11%retained austenite and more or less Cu precipitates were observed in the simulated HAZs except for *** impact test indicated that the optimum toughness was obtained in FGHAZ,which was not only associated with grain refinement,but also correlated with deformation-induced transformation of the retained austenite,variant confi guration as interleaved type and a relatively weak variant *** toughness of ICHAZ and SCHAZ exhibited a slight downtrend due to the presence of Cu *** CGHAZ has the lowest toughness in the simulated HAZs,which was attributed to grain coarsening and heavy variant *** addition,the contribution of Cu precipitates to yield strength in simulated HAZs was estimated based on Russell–Brown *** demonstrated an inverse variation trend to toughness.

关键词： Low-carbon high-strength steel Heat-affected zone Cu addition Toughness Precipitation strengthening

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Simulated Calculations of Strain Induced Precipitation Behaviorin a Nb-Ti-V Steel

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Journal of Materials Science & Technology 1998年第6期14卷 571-573页

作者： Qu, Jinbo wang, zhaodong Liu, Xianghua wang, Guodong NE Univ Technol State Key Lab Rolling & Automat Shenyang 110006 Peoples R China

On the basis of regular solution sublattice model and classical nucleation and growth theory, strain induced precipitation kinetics in Nb-Ti-V combined treated microalloying steels has been calculated. The calculated precipitation-time-temperature diagram is in reasonable agreement with experimental results obtained from isothermal stress relaxation method. (Edited author abstract) 11 Refs.

关键词： Steel

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

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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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Effect of Coiling Temperature on the Evolution of Texture in Ferritic Rolled Ti-IF Steel

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Journal of Materials Science & Technology 2007年第3期23卷 337-341页

作者： zhaodong wang Yanhui CUO Wenying XUE Xianghua LIU Cuodong wang The State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 China

The effect of coiling temperatures on the evolution of texture in Ti-IF steel during ferritic hot rolling, cold rolling and annealing was studied. It was found that texture evolution at high temperature coiling is absolutely different from that at low temperature one. The hot band texture includes a strong α-fiber as well as a weak γ-fiber after ferritic hot rolling and low temperature coiling. Both of them intensify after cold rolling and a γ-fiber with peak at {111}〈112〉 is the main texture of annealed samples. However, the main component of the hot band texture after high temperature coiling is v-fiber. After cold rolling, the intensity of γ texture reduces; α fiber （except {111}〈110〉 component） intensifies and a strong and well-proportioned γ-fiber forms in the annealed samples.

关键词： Ti-IF steel Ferritic hot rolling Coiling temperature Texture

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Development and industrial application of ultra-fast cooling technology

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Science China(Technological Sciences) 2012年第6期55卷 1566-1571页

作者： TIAN Yong TANG Shuai wang BingXing wang zhaodong wang GuoDong State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China

A new-generation TMCP(NG-TMCP) with ultra fast cooling(UFC) as core technique was suggested instead of the conventional TMCP in which some problems are to be *** the ultra fast cooling technology has been successfully applied to the plate rolling production in Shouqin Metal Materials *** trials are reported for the production of X70 pipeline steels(about 70000 t) under UFC *** steels with reasonably good properties have been produced on an industrial *** can improve the temperature uniformity,the mechanical properties and the plate profile of X70 pipeline *** performance features of the trial plates can meet the standard of X70 pipeline *** test results have shown that the qualification rate of shape control,the performance and charpy impact properties for the trial plates are 95%,97% and 98%,*** impact values of X70 pipeline steel at UFC mode exceed the standard requirements of X80 pipeline *** productivity is enhanced because cutting quantity of head and tail of the plate is *** enhancement of control accuracy of the red back temperatures is favorable for industrial production of X70 pipeline *** reduced production of the steel-making has been industrially achieved,since a new composition was designed by reducing the vanadium content to less than 0.045 wt.%.

关键词： pipeline steel ultra fast cooling the reduced production plate

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Effect of Nanoparticle Type and Surfactant on Heat Transfer Enhancement in Spray Cooling

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Journal of Thermal Science 2020年第3期29卷 708-717页

作者： wang Bingxing LIU Zhixue ZHANG Bo XIA Yue wang zhaodong wang Guodong The state key laboratory of rolling and automation(RAL) Northeastern UniversityShenyang 110819China

In this study,the heat transfer characteristics of nanofluids used in spray cooling systems were *** nanofluids,i.e.,Cu,CuO,and Al2 O3,respectively,with volume fractions ranging from 0.1%to0.5%,as well as different volume fractions of a surfactant Tween 20,were *** addition,their contact angles were measured to examine the heat-transfer *** the same experimental conditions,with the increase in the volume fraction of the Cu nanoparticles from 0.1%to 0.5%,the maximum heat flux qmax increased from 3.36 MW/m2 to 3.48 MW/m2 from the impinging central point to r=30 mm(r is the distance from the impingement point),and the corresponding temperature of qmax increased from 400℃to 420℃.Results revealed that with increasing Tween 20 concentrations,the contact angle decreased because of the decrease in the surface tension of nanofluids and improvement of the wetting ability,and the corresponding qmax increased from 3.48 MW/m2 to 3.94 MW/m2 at the impact central point.

关键词： spray cooling nanofluids surfactant wettability heat flux

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Thermodynamic Calculations of Composition of Carbide and Nitride Precipitates and Precipitation Order in Multi-Microalloyed Steels

引用

Journal of Iron and Steel Research International 1998年第1期5卷 38-41页

作者： Qu Jinbo wang zhaodong Liu Xianghua wang Guodong Northeastern University

By means of regular solution sublattice model,the mole fraction and composition of complex carbide and nitride precipitates in Nb-Ti-V microalloyed steels are calculated *** prediction of precipitation order of carbides and nitrides in complex precipitates is performed according to the calculated results at various austenitizing *** calculation can provide thermodynamic basis for quantitative prediction of complex precipitation behavior in NbTi-V-containing steels.

关键词： carbide nitride precipitation order microalloyed steel

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Microstructure and Mechanical Properties of Nb-B bearing Low Carbon Steel Plate: Ultrafast Cooling versus Accelerated Cooling

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Journal of Wuhan University of Technology(Materials Science) 2017年第3期32卷 619-624页

作者：王丙兴 DONG Fuzhi wang zhaodong RDK Misra wang Guodong State Key Laboratory of Rolling and Automation Northeastern University Laboratory for Excellence in Advanced Steel Research Center for Structural and Functional Materials Research and Innovation and Department of Metallurgical and Materials Engineering University of Texas at El Paso

The microstructure and mechanical properties of low carbon bainite high strength steel plate were studied via different cooling paths at the pilot scale. There was a significant increase in mechanical properties, and notably, the yield strength, tensile strength, and toughness at-40 ℃ for the tested steel processed by ultra-fast cooling were 126 MPa, 98 MPa and 69 J, respectively, in relation to steel processed by accelerated cooling. The ultra-fast cooling rate not only refined the microstructure, precipitates, and martensiteaustenite（M/A） islands, but also contributed to the refinement of microstructure in thick plates. The large size M/A constituents formed at lower cooling rate experienced stress concentration and were potential sites for crack initiation, which led to deterioration of low-temperature impact toughness. In contrast, the acicular ferrite and lath bainite with high fraction of high-angle grain boundaries were formed in steel processed by ultra-fast cooling, which retarded cleavage crack propagation.

关键词： TMCP ultra-fast cooling M/A constituent low-temperature toughness

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Strength and ductility enhancement of twin-roll cast Al-Zn-Mg-Cu alloys with high solidification intervals through a synergistic segregation-controlling strategy

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Journal of Materials Science & Technology 2023年第11期142卷 225-239页

作者： Bing Lu Yong Li Wei Yu Haiyao wang Yin wang zhaodong wang Guangming Xu State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China Guangxi Advanced Aluminum Processing Innovation Center Co.LTD Nanning 530007China Key Laboratory of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang 110819China

Center segregation and banded intergranular segregation(B-IGS)should be well controlled to improve the mechanical properties of twin-roll cast(TRC)aluminum alloys,especially for alloys with high solid-ification *** the present work,a synergistic grain refinement strategy was designed using an Al-5Ti-B grain refiner and Ti,Zr,and Sc microalloying elements to simultaneously control center seg-regation and B-IGS in TRC Al-Zn-Mg-Cu *** the grain size decreased,center segregation defects were eliminated and transformed into dispersed B-IGS defects;simultaneously,the width and length of the B-IGS were also ***,the macro-distributions of the alloying elements along the thickness direction became more homogeneous due to a weak shear-induced dilation *** well-controlled multiscale segregation improved the uniformity of the alloy macrostructure,accelerated the redissolution of the crystalline phase,dispersed the aggregated residual phase,and refined grains under the T6 ***,the strength and ductility of the alloys under the T6 state were simultaneously improved,and the hardness distribution along the thickness direction became more ***,the underlying mechanisms of segregation evolution and strength and ductility enhancements were *** work provides a novel strategy to effectively control multiscale segregation and produce high-performance aluminum alloys with high solidification intervals by TRC.

关键词： Twin-roll casting Al-Zn-Mg-Cu alloy Center segregation Banded intergranular segregation Mechanical properties Grain refinement

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