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Influence of metallurgical processing parameters on defects in cold-rolled steel sheet caused by inclusions

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International Journal of Minerals,Metallurgy and Materials 2019年第4期26卷 440-446页

作者： Rui Wang yan-ping bao Yi-hong Li Zhi-jie yan Da-zhao Li yan Kang School of Materials Science and Engineering North University of China State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing School of Materials Science and Engineering Taiyuan University of Science and Technology

The cleanliness and defects for cold-rolled steel sheet caused by inclusions are greatly influenced by parameters in the metallurgical processing. Good control of parameters during the processing can lead to a better product. In this paper, data mining was used to explore the influence of parameters on defects in steel sheets. A decision tree model was established and it was found that the oxygen content before deoxidation, the end-point temperature of the converter, and the temperature before deoxidation had a great impact on the defects in the cold-rolled sheet that were caused by inclusions. This finding was confirmed by experiments with infrared absorption, scanning electron microscopy(SEM), energy dispersive X-ray spectroscopy(EDS), and automatic inclusion analysis methods. After optimization according to results from the model and experiments, the defect rate caused by the inclusions was reduced from 0.92% to 0.38%.

关键词： IF steel steel cleanliness data mining inclusions

Preparation of N-chloramine-Decorated AgCl Nanoparticles with Enhanced Bactericidal Activity

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Biomedical and Environmental Sciences 2020年第9期33卷 723-726页

作者： XU Jia Rong ZHAO yan bao Engineering Research Center for Nanomaterials Henan UniversityKaifeng 475004HenanChina

The threat of bacteria and pathogens to human health and environmental safety has become a major public concern. In the fight against pathogenic bacteria, much effort has been expended on designing new antibacterial agents[1]. To date,various materials such as metals, oxides, Nhalamines, polymers, chitosan, and graphene have been used as antibacterial agents[2,3].

关键词： designing oxides metals

Two Schemes for Probabilistic Remote Preparation of a Four-Particle Entangled Cluster-Type State

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Communications in Theoretical Physics 2014年第3期61卷 305-314页

作者： HOU Kui WANG Hong-yan LI Yi-bao Department of Mathematics and Physics Anhui Jianzhu University Hefei 230601 China

Using partial entangled states as the quantum channel, two schemes for probabilistic remote preparation of the four-particle cluster-type state with real and complex coefficients are presented. In the first scheme, the sender and the receiver share two partial Bell states and one partial three-qubit GHZ stats as the quantum channel, and the sender can help a remote receiver to prepare a four-particle entangled cluster-type state by using three-qubit projective measurements with certain probability. In the second scheme, the quantum channel is composed of two partial three-qubit GHZ states, the remote state preparation(RSP) can be successfully realized via the positive operator valued measure(POVM), and the two-particle projective measurements are also needed in this process. The total success probability and classical communication cost are calculated.

关键词： remote state preparation GHZ state Positive operator-valued measure classical information

Mathematical model of deoxidization with post stirring in a combined blowing converter

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International Journal of Minerals,Metallurgy and Materials 2010年第5期17卷 541-545页

作者： Jie Feng yan-ping bao Xun Wu Heng Cui Engineering Research Institute University of Science and Technology Beijing Beijing 100083 China School of Materials Science and Engineering Heibei University of Science and Technology Shijiazhuang 050035 China

Dissolved oxygen in the steel at the terminal of the converter smelting process is the main cause for the formation of oxide inclusions, and the high terminal oxygen content worsens the steel cleanness. However, post stirring in a combined blowing converter can promote the carbon-oxygen reaction in the liquid steel and reduce the dissolved oxygen content at the terminal of the converter smelting process. Thus, the mathematical model of deoxidization in the post stirring process was obtained, and the rationality of which was further verified by industrial tests. Finally, it is concluded that the product of dissolved carbon and oxygen, i.e. w[C]·w[O], decreases obviously after adopting the new technique of post stirring in the combined blowing converter.

关键词： steelmaking converter deoxidization mathematical model

Fair Efficiency Comparisons of Decoy-State Quantum Key Distribution Protocols

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Chinese Journal of Electronics 2018年第2期27卷 241-249页

作者： LI Hongxin GAO Ming yan Xueping yan bao HAN Yu SHAN Ling MA Zhi Information Engineering University State Key Laboratory of Mathematical Engineering and Advanced Computing College of Animal Science and Technology Henan University of Science and Technology

Taking the schemes based on different formulas of secure key rate as examples, we give a fair comparison between typical protocols under Universal composable(UC) security frame. Through analyzing the relationship of security parameters in post-processing stage and final secure key rate, we achieve the unified quantification between protocols based on Gottesman-Lo-L¨utkenhausPreskill(GLLP) formula and the ones under UC *** on the above research, the impact of different sending lengths and secure parameters on secure key rate is investigated. Besides, we analyze the conditions of fair comparison, and for the first time we give a fair comparison between the protocols based on GLLP formula and smooth entropy. By typical efficiency comparisons, we summarize the way for improving secure key rate in the light intensity choice and the single bit error rate estimation method.

关键词： Quantum key distribution(QKD) Finite-key Universal composable(UC) Fair comparison

Optimization of strand and final electromagnetic stirrers of round bloom casters with multiple sections

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International Journal of Minerals,Metallurgy and Materials 2016年第10期23卷 1150-1156页

作者： Rui Wang yan-ping bao Yi-hong Li Hang-Hang An State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing School of Material Science and Technology Taiyuan University of Science and Technology

Strand electromagnetic stirring（S-EMS） and final electromagnetic stirring（F-EMS） are the main methods used to improve the center porosity and segregation for round blooms. To optimize the stirring conditions, nail shooting tests were conducted for three sections of large round blooms with diameters of ф380 mm, ф450 mm, and ф600 mm. Acid leaching and sulfur print tests were used to investigate the shell thickness. Based on the results of nail shooting tests, a mathematical model of solidification was established, and the variation of shell thickness and the central solid fraction were exactly calculated by the model. By taking all sections into account, the locations of S-EMS and F-EMS were optimized for each section. In the results, the macro-segregation of various sections is improved after the locations of S-EMS and F-EMS systems are changed.

关键词： continuous casting electromagnetic stirring blooms mathematical models optimization

In-depth analysis of the fatigue mechanism induced by inclusions for high-strength bearing steels

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International Journal of Minerals,Metallurgy and Materials 2021年第5期28卷 826-834页

作者： Chao Gu Wen-qi Liu Jun-he Lian yan-ping bao State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China Department of Mechanical Engineering Aalto UniversityPuumiehenkuja 302150 EspooFinland

A numerical study of stress distribution and fatigue behavior in terms of the effect of voids adjacent to inclusions was conducted with finite element modeling simulations under different *** mechanisms were also analyzed *** results showed that the effects of inclusions on fatigue life will distinctly decrease if the mechanical properties are close to those of the steel *** the inclusions,which are tightly bonded with the steel matrix,when the Young’s modulus is larger than that of the steel matrix,the stress will concentrate inside the inclusion;otherwise,the stress will concentrate in the steel *** voids exist on the interface between inclusions and the steel matrix,their effects on the fatigue process differ with their positions relative to the *** void on one side of an inclusion perpendicular to the fatigue loading direction will aggravate the effect of inclusions on fatigue behavior and lead to a sharp stress *** void on the top of inclusion along the fatigue loading direction will accelerate the debonding between the inclusion and steel matrix.

关键词： inclusion high-strength bearing steel fatigue numerical study stress distribution

A light-regulated synthetic ion channel constructed by an azobenzene modified hydraphile

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Chinese Chemical Letters 2015年第7期26卷 851-856,920页

作者： Rong-yan yang Chun-yan bao Qiu-Ning Lin Lin-Yong Zhu Shanghai Key Laboratory for Functional Materials Chemistry Institute of Fine Chemicals East China University of Science and Technology

Biological ion channels are key molecules for cellular regulation and communication. To mimic the structure and functions of nature ion channels, a new class of light-regulated transmembrane ion channels was reported based on tri（macrocycle） hydraphile and azobenzene photoswitch （hydraphile 1 ）. The liposome-based proton transport assays showed that hydraphile 1 exhibited excellent transmem- brane activity （Y）, and Ymax arrived 0.7 at 40 μmol/L. The successful isomerization of azohenzene moiety was confirmed and qualified by UV and NMR spectra. Upon alternative irradiation of 365 nm UV light and 450 nm visible light, the transmembrane activity of hydraphile I was regulated between 0.35 and 0.5, reversibly. All the obtained results have demonstrated the promise of developing excellent synthetic ion channels with ion gating properties based on simple molecular design.

关键词： Synthetic ion channelLight-regulated ion transportHydraphilesAzobenzene photoisomerizationSelf-assembly

Effect of electromagnetic stirrer centered outside the mold on steel flow field of bloom continuous casting

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China Foundry 2023年第5期20卷 461-468页

作者： Li-dong Xing yan-ping bao Min Wang Yi-hong Li State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing(USTB)Beijing 100083China Technical Support Center for Prevention and Control of Disastrous Accidents in Metal Smelting University of Science and Technology Beijing(USTB)Beijing 100083China School of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China

Mold electromagnetic stirring technology for optimizing the flow of molten steel is now widely used in the continuous casting production process of high-quality ***,studies on the case that the center of the electromagnetic stirrer is located outside the mold have not been ***,the effect of the electromagnetic stirrer centered outside the mold on the steel flow field was studied in detail by means of numerical simulations.A Gauss meter was used to measure the magnetic induction intensity at different positions,currents,and *** test results were compared with the simulation results of electromagnetic stirring to calibrate and verify the accuracy of the electromagnetic ***,electromagnetic force was introduced into the flow field model as a source term to study its effect on the flow field under anomalous *** results show that when the center of the electromagnetic stirrer is located outside the mold,the magnetic field strength is about twice as strong as that located inside the *** also leads to an increase in the flow velocity near the electromagnetic *** a result,the optimal electromagnetic stirring parameters(200 A,2.5 Hz)were specified when the center of the electromagnetic stirrer is located outside the mold.

关键词： numerical modeling electromagnetic stirring fluid flow outside the mold bloom