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Optimal design of hot rolling process for c-mn steel by combining industrial data-driven model and multi-objective optimization algorithm

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Journal of Iron and steel Research(International) 2018年第7期25卷 700-705页

作者： Si-wei Wu Xiao-guang Zhou Jia-kuang Ren Guang-ming cao Zhen-yu Liu Nai-an Shi State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110819 Liaoning China continuous Rolling Plant of No. 3 steelmaking of Angang co. Ltd. Anshan 114021 Liaoning China

A successful mechanical property data-driven prediction model is the core of the optimal design of hot rolling process for hot-rolled strips. However, the original industrial data, usually unbalanced, are inevitably mixed with fluctuant and abnormal values. Models established on the basis of the data without data processing can cause misleading results, which cannot be used for the optimal design of hot rolling process. Thus, a method of industrial data processing of c-mn steel was proposed based on the data analysis. The Bayesian neural network was employed to establish the reliable mechanical property prediction models for the optimal design of hot rolling process. By using the multi-objective optimization algorithm and considering the individual requirements of costumers and the constraints of the equipment, the optimal design of hot rolling process was successfully applied to the rolling process design for Q345B steel with 0.017% Nb and 0.046% Ti content removed. The optimal process design results were in good agreement with the industrial trials results, which verify the effectiveness of the optimal design of hot rolling process.

关键词： Industrial data Data processing - Mechanical property Optimal design Hot rolling process c-mn steel

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Upgrade Rolling Based on Ultra Fast cooling Technology for c-mn steel

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Journal of Iron and steel Research(International) 2014年第1期21卷 86-90页

作者： Xiao-guang ZHOU Zhen-yu LIU Sheng-yong SONG Di WU Guo-dong WANG State Key Laboratory of Rolling and Automation Northeastern University

By measuring the expansion curves of a c-mn steel at different cooling rates by using an MMS-300 thermo- mechanical simulator, continuous cooling transformation curves were obtained. The new process ＂ultra fast cooling＋ laminar cooling＂ was simulated and the effects of ultra fast cooling ending temperature on microstructure had also been investigated. The hot rolling experiment was done by adopting ＂high temperature rolling-[-forepart ultra fast cooling＂ technologies at laboratory scale. The results revealed that ultra fast cooling can delay the decrease of disloca- tion density and refine ferrite grains. Diversity control of the microstructure and phase transformation strengthening can be realized by changing the ultra fast cooling ending temperature. With the decrease of ultra fast cooling ending temperature, the strength and toughness increase, but plasticity does not decrease obviously. The new technique can improve the yield strength by over 50 MPa. Therefore, the upgrade of mechanical properties of c-mn steel can be realized by using ＂high temperature rolling＋ ultra fast cooling＋laminar cooling＂ technique. compared with ＂low temperature rolling with large deformation degree＂ technique, this new technology can decrease the roiling force and in- crease the production efficiency.

关键词： ultra fast cooling c-mn steel grain refinement strengthening phase transformation strengthening grain size

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carbides/nitrides precipitates in a c-mn strip by cSP technology

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Journal of University of Science and Technology Beijing 2005年第6期12卷 517-520页

作者： Ling Zhang Wangyue Yang Weiwei Zheng Zuqing Sun Materials Science and Engineering School University of Science and Technology Beijing Beijing 100083 China The State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing 100083 China

The carbides/nitrides precipitates in ferrite grains, on grain boundaries and dislocations were investigated on a hot-rolled c-mn strip （0.16wt%c-1.22wt%mn-0.022wt%Ti） produced by the cSP （compact strip production） technology using TEM and X-ray energy dispersive spectroscopy. The Pickering＇s equation for the contribution of precipitates to the yield stress was also discussed. It is shown that there are numerous fine and dispersive precipitates Tic in the ferrite grains, on the grain boundaries and dislocations. Also there are a small amount of coarser Ti（c, N） particles and Tic particles associated with mnS. Precipitation strengthening on steels produced by the cSP technology is significant.

关键词： cSP technology c-mn steel carbides/nitrides precipitates

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Influence of mn content and Hot Deformation on Transformation Behavior of c-mn steels

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Journal of Iron and steel Research(International) 2008年第2期15卷 51-55页

作者： LI Long DING Hua DU Lin-xiu WEN Jing-lin SONG Hong-mei ZHANG Pi-jun School of Materials and Metallurgy Northeastern University Shenyang 110004 Liaoning China State Key Lab of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China Technology center Baoshan Iron and Steel Group Co. Shanghai 201900 China

The hot deformation behaviors and the microstructural evolution of plain c-mn steels with similar contents of c and Si but different contents of mn have been investigated by compressive processing using Gleeble-1500 mechanical simulator.Influence of mn and hot deformation on continuous cooling transformation of steels has been studied.The experimental results showed that deformation in austenite region accelerated transformation process,and the extent is dependent on the hot deformation and cooling conditions.The hot deformation would promote transformation process,but the increase of transformation temperature is dependent on mn contents.The results have also shown that the effect of deformation on ferrite transformation becomes more obvious with the increase of mn content at relatively low cooling rate.

关键词： c-mn steel hot deformation cooling rate phase transformation bainite

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Effect of mn content and TMcP on microstructures and mechanical properties of c-mn steels

Effect of Mn content and TMCP on microstructures and mechani...

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第五届国际低合金高强度钢会议暨第三届国际超细晶粒钢会议

作者： LI Long1,2, DING Hua1,2, DU Lin-xiu2, SONG Hong-mei3, ZHENG Fang3 (1. Northeastern University, Shenyang 110004, china 2. The State Key Lab. of Rolling and Automation of Northeastern University, Shenyang 110004, china 3. Baoshan Iron & steel Group co., Shanghai 201900, china)

Thermo-mechanical control process (TMcP) treatment was carried out on five c-mn steels containing different mn content in an experimental rolling mill, with three finish rolling temperatures (FRT) hig

关键词： c-mn steel mn content TMcP bainite mechanical properties

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