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Deformation resistance of Fe-Mn-V-N alloy under different deformation processes

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Rare Metals 2017年第10期36卷 833-839页

作者： Yun-Li Feng Jie Li Li-Qun Ai Bao-Mei Duan College of Metallurgy and Energy North China University of Science and Technology Tangshan 063009 China Key Laboratory of the Ministry of Education for Modem Metallurgy Technology Tangshan 063009 China

The deformation resistance of Fe-Mn-V-N alloy under different deformation conditions was investigated by hot compression method on thermal simulator. Effects of deformation degree, deformation temperature, and strain rate on deformation resistance were analyzed. The results show that when other conditions are constant, the deformation resistance increases with the increase in deformation degree and strain rate and decreases with the increase in deformation temperature. At the same time, the mathematical model of deformation resistance for Fe-Mn- V-N alloy was established by lstOpt software using the Levenberg-Marquardt optimization algorithm carried out on the fitting of regression coefficients, which has higher fitting precision.

关键词： Fe-Mn-V-N alloy Deformation process Deformation resistance Mathematical model

Effect of time interval on microstructure evolution of medium carbon steel during warm deformation

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Journal of Iron and Steel Research International 2019年第6期26卷 602-610页

作者： Hong-bin Li Xiao-ping Zheng De-cheng Wan Lian-sheng Chen College of Metallurgy and Energy North China University of Science and Technology Tangshan 063009 Hebei China Modem Metallurgy of Hebei Province Key Laboratory Tangshan 063009 Hebei China

The thermal mechanical simulator system (Gleeble-3500) was used to carry out the double passes compression tests. The microstructure evolution of medium carbon steel with different time intervals during warm deformation was investigated by scanning electron microscopy, transmission electron microscopy and electron back-scattered diffraction. The results show that the effects of time interval on microstructure evolution are very important. The low-angle boundaries transform into high-angle boundaries (HABs) during interval. The fraction of HABs and homogeneity of particle carbides increase with increasing time interval. In addition, the homogeneity of carbides also increases with the strain. However, the effects of time interval on the microstructure evolution are negligible when it exceeds 100 s.

关键词： Double-pass deformation Warm deformation Microstructure evolution Misorientation

Theoretical Foundation of Carbonation Pellet Process for Ferrous Sludge Recycling

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Journal of Iron and Steel Research International 2011年第12期18卷 27-31页

作者： HU Chang-qing HAN Tao ZHANG Yu-zhu ZHANG Zhi-xia College of Metallurgy and Energy Hebei United University Tangshan 063009 Hebei China Hebei Key Laboratory of Modern Metallurgy Technology Tangshan 063009 Hebei China

For the recycling of ferrous sludge from steel industry,the carbonation pellet process should be considered as a ＂green＂ process,since no impurities are added as well as CO2 can be sequestrated and *** the thermodynamic calculation,the carbonation reaction can occur spontaneously and is an exothermic *** on the kinetic analysis through unreacted core model,the interfacial chemical reaction was the rate controlling step in the initial fast stage of carbonation,and the CO2 diffusion through the CaCO3 product layer was the rate controlling step in the following extremely slow *** the carbonation bonded mechanism,the pellet strength was gained by the formation and growing of CaCO3 product *** the interfacial chemical reaction was the critical stage of the entire carbonation process,the emphasizes should be focused on the improvement of sorbent activity and the optimization of process parameters,such as pore structure,pore surface area,and total pressure,CO2 partial pressure,reaction temperature,etc to accelerate the reaction rate and to improve the quality of carbonation pellets.

关键词： CO2 sequestration ferrous sludge carbonation pellet thermodynamics kinetics unreacted core model

Preparation of dendritic bismuth film electrodes and their application for detection of trace Pb(Ⅱ)and Cd(Ⅱ)

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Chinese Journal of Chemical Engineering 2016年第3期24卷 410-414页

作者： Huizhu Zhou Huanhuan Hou Lei Dai Yuehua Li jing Zhu Ling Wang College of Chemical Engineering North China University of Science and TechnologyTangshan 063009China Hebei Province Key Laboratory of Inorganic and Non-metal Materials Tangshan 063009China

In this paper,dendritic Bi film electrodes with porous structure had successfully been prepared on glassy carbon electrode using a constant current electrolysis method based on hydrogen bubble dynamic *** electrode prepared using a large applied current density showed an increased internal electroactive area and a significantly improved electrochemical *** analytical utility of the prepared dendritic Bi film electrodes for the determination of Pb(Ⅱ)and Cd(Ⅱ)in the range of 5–50 μg·L^(-1)were presented in combination with square wave stripping voltammetry in model *** with non-porous Bi film electrode,the dendritic Bi film electrode exhibited higher sensitivity and lower detection *** prepared Bi film electrode with dendritic structure was also successfully applied to real water sample analysis.

关键词： Dendritic Bi film electrode Electro-deposition Hydrogen bubble dynamic template Square wave stripping analysis Pb(Ⅱ) and Cd(Ⅱ)

Mechanism of La2O3 as combustion improver in blast furnace coal injection

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International Journal of Coal Science & Technology 2016年第1期3卷 47-52页

作者： Yanqin Sun Bing Hu Qing Lü Shuhui Zhang College of Metallurgy and Energy Hebei United UniversityTangshan 063009 China Hebei Key Laboratory for Advanced Metallurgy Technology Tangshan 063009 China

La2O3 is a combustion improver suitable for burning pulverized coal in blast furnace. La2O3 forms the active species La3＋（CO-）3 that weakens the bridge adhesion of carbon structural units and alters the lattice structures, thus reducing the activation energy of the pulverized coal and accelerating the burning process. Research shows that La2O3 can form the active species La3＋（CO-）3, which weakens the bridge adhesion of carbon structural units and alters the lattice structures of the fixed carbon, hence decreasing the activation energy of the pulverized coal and accelerating the burning process.

关键词： Combustion improver La2O3 - Microcrystalline parameter - Average particle diameter Morphologicalappearance

Recent advances in metals and metal oxides as catalysts for vanadium redox flow battery:Properties,structures,and perspectives

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Journal of Materials Science & Technology 2021年第16期75卷 96-109页

作者： Yanrong Lv Chao Han Ye Zhu Tianao Zhang Shuo Yao Zhangxing He Lei Dai Ling Wang School of Chemical Engineering North China University of Science and TechnologyTangshan 063009China Hebei Province Key Laboratory of Photocatalytic and Electrocatalytic Materials for Environment North China University of Science and TechnologyTangshan 063009China

Vanadium redox flow battery(VRFB)is a kind of battery with wide application *** material is one of the key components of VRFB,and its stability directly affects the performance of *** all kinds of electrode materials,carbon-based material has the best comprehensive ***,carbon-based electrodes still have disadvantages such as poor hydrophilicity and low electrochemical activity which need to be *** of the effective ways to improve the performance of electrode is to modify carbon-based material with metals and metal *** metal catalysts have excellent electrical conductivity and high catalytic *** metal oxide catalysts have the advantages of low cost,wide variety and strong oxidizing *** work introduced the application of metal and metal oxide modified electrodes in VRFB in recent years,classified the catalysts,studied their catalytic performance and *** metal catalysts were reviewed from precious metals and base *** metal oxide catalysts were classified and discussed according to the similar properties of the same group *** work compared different modification methods,summarized the research progress of metal and metal oxide modification,and proposes the future development direction of electrodes and catalysts.

关键词： Energy storage Vanadium redox flow battery Carbon-based material Metal oxide Metal Electrocatalyst

Nanostructured N-doped carbon materials derived from expandable biomass with superior electrocatalytic performance towards V^(2+)/V^(3+) redox reaction for vanadium redox flow battery

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Journal of Energy Chemistry 2021年第8期30卷 706-714,I0014页

作者： Yingqiao Jiang Mengchen Du Gang Cheng Peng Gao Tingting Dong Jing Zhou Xiaojian Feng Zhangxing He Yuehua Li Lei Dai Wei Meng Ling Wang School of Chemical Engineering North China University of Science and TechnologyTangshan 063009China Hebei Province Key Laboratory of Photocatalytic and Electrocatalytic Materials for Environment North China University of Science and TechnologyTangshan 063009China

Vanadium redox flow battery(VRFB)is one of the most promising large-scale energy storage systems,which ranges from kilowatt to ***,poor electrochemical activity of electrode for two redox couples still restricts the extensive applications of *** with V^(2+)/V^(3+)redox reaction,V^(2+)/V^(3+)reaction plays a more significant role in voltage loss of VRFB owing to slow heterogeneous electron transfer ***,N-doped carbon materials derived from scaphium scaphigerum have been developed as negative electrocatalyst by hydrothermal carbonization and high-temperature nitridation *** undoped carbon material hardly has electrocatalytic ability for V^(2+)/V^(3+)*** on this,N-doped carbon materials with urea as nitrogen source exhibit excellent electrocatalytic *** the material nitrided at 850°C(SSC/N-850)exhibits the best performance among those from700 to 1000℃.SSC/N-850 can accelerate the electrode process including V^(2+)/V^(3+)reaction and mass transfer of active ions due to the large reaction place,more active sites,and good *** effect of catalyst on comprehensive performance of cell was ***/N-850 can improve the charge-discharge performance *** of SSC/N-850 can lessen the electrochemical polarization of cell,further resulting in increased discharge capacity and energy *** capacity and energy efficiency increase by 81.5%and 9.8%by using SSC/N-850 as negative catalyst at 150 m A cm^(-2),*** study reveals that the developed biomass-derived carbon materials are the low-cost and efficient negative electrocatalyst for VRFB system.

关键词： Vanadium redox flow battery Electrocatalyst Biomass Expandable characteristic Improved electrochemical kinetics

Electrochemical behavior of Cu in the (NaCl-KCl-CuCl) molten salt

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Acta Metallurgica Sinica(English Letters) 2011年第6期24卷 466-472页

作者： Yungang LI Jie LI Kuai ZHANG Limin LIU College of Metallurgy ＆ Energy Hebei United University Tangshan 063009 China Key Laboratory of Metastable Materials Science ＆ Technology Yanshan University Qinhuangdao 066004 China Qinggong College Hebei United University Tangshan 063009 China

The electrochemical reaction mechanism and electrocrystallization process of Cu on copper electrode in the eutectic NaC1-KC1-CuC1 molten salt were investigated by means of cyclic voltammetry, chronopotentiometry and chronoamperometry tech-nique at 710℃. The results show that the electrochemical reaction process of Cu is a quasi-reversible process mix-controlled by Cu＋ diffusion rate and electron transport rate;the electrochemical reduction mechanism is Cu＋e→Cu;the electrocrystallization process of copper is an instantaneous hemispheroid three-dimensional nucleation process; the Cu diffusino coefficient is 4.3×10^-4cm^2·s^-1 under the experimental conditions.

关键词： NaC1-KC1-CuC1 Copper Electrochemical reduction mecha-nism Electrocrystallization process

Dependence of tensile properties on microstructural features of bimodal-sized ferrite/cementite steels

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Journal of Iron and Steel Research International 2017年第1期24卷 67-76页

作者： Jiang-li Ning Yun-li Feng Ming-ming Wang Shen-bai Zheng Jie Li College of Metallurgy and Energy North China University of Science and TechnologyTangshan 063009HebeiChina

A medium-carbon steel was processed through different warm rolling techniques,and the microstructural features with bimodal grain size distribution were found to be *** combination of strength and ductility was ameliorated in the steel processed through warm rolling characterized by biaxial *** enhanced strength is attributed to the densely distributed fine intragranular cementite particles and the small grain size in the coarse grain *** enhanced uniform elongation is due to the improved work hardening behavior at the large-strain *** work hardening behavior is predominantly ascribed to the finely dispersed intragranular *** relatively small grain size with nearly equiaxed shape in the coarse grain regions helps stabilize the uniform deformation to a large strain.

关键词： Tensile property Ferrite/cementite steel Bimodal-sized structure Warm rolling Work hardening rate