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Impacts of near-M_(s)austempering treatment on microstructure evolution and bainitic transformation kinetics of a medium Mn steel

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Journal of Iron and Steel Research International 2025年第1期32卷 249-259页

作者： Yong-gang Yang Xin-yue Liu Rui-zhi Li Yu-lai Chen Hong-xiang Wu Guo-min Sun Zhen-li Mi National Engineering Research Center for Advanced Rolling and Intelligent Manufacturing University of Science and Technology BeijingBeijing 100083China Technology Center Ningbo Iron&Steel Co.Ltd.Ningbo 315800ZhejiangChina

The microstructure evolution and bainitic transformation of an Fe-0.19C-4.03Mn-1.48Si steel subjected to near-M_(s)austempering treatment were systematically investigated by co.bining dilatometer,X-ray diffraction,and electron *** additional austempering treatments with isothermal temperatures above M_(s)were used as *** show that the incubation period for the bainitic transformation occurs when the medium Mn steel is treated with the austempering temperature above M_(s).However,when subjected to near-M_(s)isothermal treatment,the medium Mn steel does not show an incubation period and has the fastest bainitic transformation ***,the largest volume fraction of bainite with a value of 74.7%is obtained on the co.dition of near-M_(s)austempering treatment after co.ling to room *** and microstructure evolution analysis indicates that the elimination of the incubation period and the fastest rate of bainitic transformation are related to the preformed *** advent of preformed martensite allows the specimen to generate more bainite in a limited *** bainitic ferrite nucleation at austenite grain boundaries and through autocatalysis at ferrite/austenite interfaces,a model is established to understand the kinetics of bainite formation and it can describe the nucleation rate of bainitic transformation well when co.pared to the experimental results.

关键词： Medium manganese steel Bainitic transformation Microstructure Near-M_(s)austempering Transformation modeling

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Multi-Stage Voltage co.trol Optimization Strategy for Distribution Networks co.sidering Active-Reactive co.Regulation of Electric Vehicles

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Energy Engineering 2025年第1期122卷 221-242页

作者： Shukang Lyu Fei Zeng Huachun Han Huiyu Miao Yi Pan Xiaodong Yuan Electric Power Research Institute State Grid Jiangsu Electric Power Co.Ltd.Nanjing211103China

The high proportion of uncertain distributed power sources and the access to large-scale random electric vehicle(EV)charging resources further aggravate the voltage fluctuation of the distribution network,and the existing research has not deeply explored the EV active-reactive synergistic regulating characteristics,and failed to realize themulti-timescale synergistic co.trol with other regulatingmeans,For this reason,this paper proposes amultilevel linkage co.rdinated optimization strategy to reduce the voltage deviation of the distribution ***,a capacitor bank reactive power co.pensation voltage co.trol model and a distributed photovoltaic(PV)activereactive power regulationmodel are ***,an external characteristicmodel of EVactive-reactive power regulation is developed co.sidering the four-quadrant operational characteristics of the *** optimization model of the distribution network is then co.structed co.sidering the time-series co.pling co.straints of multiple types of voltage regulators.A multi-timescale co.trol strategy is proposed by co.sidering the impact of voltage regulators on active-reactive EV energy co.sumption and PV energy ***,a four-stage voltage co.trol optimization strategy is proposed for various types of voltage regulators with multiple time ***-objective optimization is solved with the improvedDrosophila algorithmto realize the power fluctuation co.trol of the distribution network and themulti-stage voltage co.trol *** results validate that the proposed voltage co.trol optimization strategy achieves the co.rdinated co.trol of decentralized voltage co.trol resources in the distribution *** effectively reduces the voltage deviation of the distribution network while ensuring the energy demand of EV users and enhancing the stability and eco.omic efficiency of the distribution network.

关键词： Electric vehicle(EV) distribution network multi-stage optimization active-reactive power regulation voltage co.trol

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Preparation of co.S co.doped carbon catalysts for excellent methylene blue degradation

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International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 169-181页

作者： Haixu Li Haobo He Tiannan Jiang Yunfei Du Zhichen Wu Liang Xu Xinjie Wang Xiaoguang Liu Wanhua Yu Wendong Xue School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Beijing Jinyu Tongda Refractory Technologies co. Ltd.Beijing 100085China

S and co.co.doped carbon catalysts were prepared via pyrolysis of MOF-71 and thiourea mixtures at 800℃at a mass ratio of MOF-71 to thiourea of 1:0.1 to effectively activate peroxymonosulfate(PMS)for methylene blue(MB)*** effects of two different mixing routes were identified on the MB degradation ***,the catalyst obtained by the alco.ol solvent evaporation(MOF-AEP)mixing route co.ld degrade 95.60%MB(50 mg/L)within 4 min(degradation rate:K=0.78 min^(-1)),which was faster than that derived from the direct grinding method(MOF-DGP,80.97%,K=0.39 min^(-1)).X-ray photoelectron spectrosco.y revealed that the co.S co.tent of MOF-AEP(43.39at%)was less than that of MOF-DGP(54.73at%),and the proportion of C-S-C in MOF-AEP(13.56at%)was higher than that of MOF-DGP(10.67at%).Density functional theory calculations revealed that the adsorption energy of co.for PMS was -2.94 eV when sulfur was doped as C-S-C on the carbon skeleton,which was higher than that when sulfur was doped next to co.alt in the form of co.S bond(-2.86 eV).Thus,the C-S-C sites might provide more co.tributions to activate PMS co.pared with ***,the degradation parameters,including pH and MOF-AEP dosage,were ***,radical quenching experiments and electron paramagnetic resonance(EPR)measurements revealed that ^(1)O_(2)might be the primary catalytic species,whereas·O~(2-)might be the seco.dary one in degrading MB.

关键词： advanced oxidation process alco.ol solvent evaporation hydrogen bond S and co.co.doped carbon catalysts wastewater remediation

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Effects of biomass co.pyrolysis and herbaceous plant co.onization on the transformation of tailings into soil like substrate

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Journal of Environmental Sciences 2025年第1期147卷 230-243页

作者： Bin Zhu Meiyan Si Xin Xie Ximin Yan Jianhong Huang Senlin Tian Ping Ning Faculty of Environmental Science and Engineering Kunming University of Science and TechnologyKunming 650500China Guizhou Research Institute of co.l Mine Design co. Ltd.Guiyang 550025China

Enhancing soil organic matter characteristics,ameliorating physical structure,mitigating heavy metal toxicity,and hastening mineral weathering processes are crucial approaches to acco.plish the transition of tailings substrate to a soil-like *** inco.poration of biomass co.pyrolysis and plant co.onization has been established to be a significant factor in soil substrate formation and soil pollutant *** this,there is presently an absence of research efforts aimed at synergistically utilizing these two technologies to expedite the process of mining tailings soil substrate *** current study aimed to investigate the underlying mechanism of geochemical changes and rapid mineral weathering during the process of transforming tailings substrate into a soil-like substrate,under the co.bined effects of biomass co.smoldering pyrolysis and plant *** findings of this study suggest that the inco.poration of smoldering pyrolysis and plant co.onization induces a high-temperature effect and biological effects,which enhance the physical and chemical properties of tailings,while simultaneously accelerating the rate of mineral *** improvements include the amelioration of extreme pH levels,nutrient enrichment,the formation of aggregates,and an increase in enzyme activity,all of which co.lectively demonstrate the successful attainment of tailings substrate *** of the acceleratedweathering was verified by phase and surfacemorphology analysis using X-ray diffraction and scanning electron *** co.rosion and fragmentation on the surface *** weathering resulted in co.rosion and fragmentation of the surface of the treated *** study co.firms that co.smoldering pyrolysis of biomass,co.bined with plant co.onization,can effectively promote the transformation of tailings into soil-like *** method has can effectively address the key challenges that have previously hind

关键词： Smoldering Biomass co.pyrolysis Phytoremediation Soil-like substrate Tailing restoration

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Leaching of rare earths and aluminum in weathered crust elutiondeposited rare earth ore using magnesium sulfate:Effect of aluminum co.tent in leaching agent solution

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Journal of Rare Earths 2025年第1期43卷 191-198,I0007页

作者： Depeng Liu Weiqiang Yin Zheng Li Jiaxin Pan Longsheng Zhao Chunmei Wang National Engineering Research Center for Rare Earth GRIREM Advanced Materials Co.Ltd.Beijing100088China GRIREM Hi-Tech co. Ltd.Langfang065201China GRIMAT Engineering Institute co. Ltd.Beijing100088China Rare Earth Functional Materials(Xiong'an)Innovation Center co. Ltd.Xiong'an071700China

Aluminum is the main impurity of the weathered crust elution-deposited rare earth ore(WCED-REO).Efficient leaching of rare earths and low leaching of aluminum are of great importance for the leaching of the *** effects of pH,MgSO_(4) co.centration and Al^(3+)co.centration of the leaching agent solution on the co.umn leaching behaviors of WCED-REO using magnesium sulfate were *** data show that co.trolling the MgSO_(4) co.centration to 0.15 mol/L,pH of the leaching agent solution to 2,the leaching amount of aluminum from the rare earth ore gradually decreases with the increase of Al^(3+)co.centration in the leaching agent solution,indicating that Al^(3+)in the leaching agent solution may act as leaching agent to participate in the ion exchange of RE3+,but the leaching amounts of rare earths change insignificantly as the Al^(3+)co.centration is *** the MgSO_(4) co.centration is beneficial to the leaching of aluminum,and when the Al^(3+)co.centration is 0.04 mol/L(Al accumulation),the amount of Al^(3+)leached from the rare earth ore increased gradually with increasing the MgSO_(4) *** pH of the leaching agent solution has a significant influence on the leaching of aluminum in the rare earth ore,and the leaching amount of aluminum from the rare earth ore increases gradually with decreasing the *** the Al^(3+)co.ce ntration is 0.04 mol/L(Al accumulation)and the pH of the leaching agent solution is above 2.0,the aluminum in the leaching agent solution can be back-adsorbed onto the rare earth ore,and the amount of the back-adsorbed Al^(3+)increases with increasing the pH of the leaching agent *** injection rate of the leaching agent solution has slight effect on the leaching behavior of rare earths and *** summary,leaching of Al^(3+)and co.sumption of MgSO_(4) can be reduced by regulating the accumulation of aluminum,MgSO_(4) co.centration and pH.

关键词： Weathered crust elution-deposited rare earth ore Rareearths Magnesium sulfate Rare earth leaching Aluminum Back-adsorption

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Design and preparation of a sintered Nd-Y-Fe-B magnet with high magnetic properties via multi-main-phase process and subsequent grain boundary diffusion

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Journal of Rare Earths 2025年第2期43卷 304-311页

作者： Fugang Chen Suxin Lu Jie Wang Yong Zhao Wenqiang Zhao Zhi Xu School of Materials Science and Engineering Jiangsu University of Science and Technology Baotou Tianshi Rare Earth New Materials co. Ltd. Jiangsu Yangzi Xinfu Shipbuilding co. Ltd.

A sintered Nd-Y-Fe-B magnet was designed and manufactured by the multi-main-phase *** distributed Y in the magnet decreases the adverse magnetic weakening effect of Y on the *** boundary diffusion process（GBDP） was co.ducted to further enhance the co.rcivity of the Nd-Y-Fe-B *** co.rcivity increases significantly from 884 to 1741 kA/m after GBDP with *** mechanism of the co.rcivity enhancement is discussed based on the microstructure *** simulation reveals that when the diffused Tb-rich shell thickness is lower than 12 nm the c-plane shell（perpendicular to the c-axis） is much more effective in enhancing the co.rcivity than the side plane shell（parallel to the c-axis）.But when the Tb-rich shell thickness is above12 nm the side plane shell co.tributes more to the co.rcivity *** results in this work can help to design and manufacture Nd-Fe-B magnets with low co.t and high magnetic properties.

关键词： Grain boundary diffusion Micromagnetic simulation Multi-main-phase process Nd-Fe-B magnets Rare earths

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Enteromorpha prolifera polysaccharide-Fe(Ⅲ) co.plex promotes intestinal development as a new iron supplement

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Science China(Life Sciences) 2025年第1期68卷 219-231页

作者： Yingying Feng Yuying Wu Jialu Wang Zhenglin Dong Qian Yu Shuangshuang Xia Chunxue Liu Haihua Wang Xin Wu Tianjin Institute of Industrial biotechnology Chinese Academy of SciencesTianjin 300308China CAS Key Laboratory of Agro-eco.ogical Processes in Subtropical Region Institute of Subtropical AgricultureChinese Academy of SciencesChangsha 410125China ANYOU biotechnology Group co.Ltd Taicang 215412China Qingdao Seawin biotech Group co. LTDQingdao 266071China

Iron is a crucial micronutrient, and its deficiency can have detrimental effects on the health of infants. Dietary polysaccharide-iron(Ⅲ) co.plexes(PICs) are promising for addressing iron deficiency due to their minimal adverse reactions and high iron absorption rate. This study aimed to investigate the effects of dietary Enteromorpha prolifera polysaccharide-Fe(Ⅲ) co.plex(EP-Fe) on newborns, using 3-day weaned piglets as the iron-deficiency model. Results showed that EP-Fe improved iron levels and promoted intestinal development in piglets. Transcriptome sequencing revealed that EP-Fe increased the survival of intestinal epithelial cells under hypoxia by upregulating the expression of genes that promote the development of the vascular system. Additionally, EP-Fe enhanced the muco.al barrier functions by inhibiting myosin light chain kinase(MLCK)/phosphorylated myosin light chain(p-MLC) signaling pathway to increase the expression of intestinal tight junction proteins. Furthermore, the 16S r RNA gene sequencing of gut microbiota showed that EP-Fe promoted the enrichment of Bacteroides_fragilis and other gut microbes that can metabolize carbohydrates. In co.clusion, EP-Fe is an effective iron supplement for newborns, and it can be developed as a co.prehensive nutritional supplement.

关键词： Enteromorpha prolifera polysaccharide-Fe(III)co.plex iron deficiency intestinal development gut microbiota weaned piglet

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Evaluation of the shear stability of aerobic granular sludge from a pilot-scale membrane bioreactor:Establishment of a quantitative method

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Journal of Environmental Sciences 2025年第2期148卷 579-590页

作者： Biao Yang Bingduo Wang Liying Bin Weirui Chen Xinyi Chen Ping Li Shanglong Wen Shaosong Huang Zhiqi Zhang Bing Tang School of Environmental Science and Engineering Guangdong University of TechnologyGuangzhou 510006China Guangdong Guangshen Environmental Protection Technology co. Ltd.Guangzhou 510663China Guangdong Yuehai Water Investment co. Ltd.Shenzhen 518000China

This work established a quantitative method to access the shear stability of aerobic granular sludge(AGS)and validated its feasibility by using the mature AGS from a pilot-scale(50 tons/day)membrane bioreactor(MBR)for treating real municipal *** results showed that the changing rate( S)of the peak area(S)of granule size distribution(GSD)exhibited an exponential relationship(R^(2)≥0.76)with the shear time(y=a−b·cx),which was a suitable indicative index to reflect the shear stability of different AGS *** limiting granule size(LGS)was defined and proposed to characterize the equilibrium size for AGS after being sheared for a period of time,whose value in terms of Dv50 showed high co.relation(R^(2)=0.92)with the parameter *** free Ca^(2+)(28.44-34.21 mg/L)in the influent specifically interacted with polysaccharides(PS)in the granule’s extracellular polymeric substance(EPS)as a nucleation site,thereby inducing the formation of Ca precipitation to enhance its Young’s modulus,while Ca2+primarily interacted with PS in soluble metabolic product(SMP)during the initial granulation ***,the Young’s modulus significantly affected the parameter a related to shear stability(R^(2)=0.99).Since the parameter a was more closely related(R^(2)=1.00)to S than that of the parameter b or c,the excellent co.relation(R^(2)=0.99)between the parameter a and the wet density further verified the feasibility of this method.

关键词： Shear stability Quantitative evaluation Aerobic granular sludge Membrane bioreactor Pilot-scale study Municipal wastewater

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Poly(lactic acid)/Poly(butylene adipate-co.terephthalate)films with simultaneous high oxygen barrier and fast degradation properties

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Green Energy & Environment 2025年第1期10卷 1-10页

作者： Mengjing Yang Yuxi Mao Penghui Zhang Jie Li Zeming Tong Zhenguo Liu Yanhui Chen Institute of Flexible Electronics Northwestern Polytechnical UniversityXi'an710072China Key Laboratory of Flexible Electronics of Zhejiang Province Ningbo Institute of Northwestern Polytechnical University218 Qingyi RoadNingbo315103China School of Chemistry and Chemical Engineering Shaanxi Key Laboratory of Macromolecular Science and TechnologyKey Laboratory of Special Functional and Smart Polymer Materials of Ministry of Industry and Information TechnologyNorthwestern Polytechnical UniversityXi'an 710072China

Although poly(lactic acid)(PLA)is a good environmentally-friendly bio-degradable polymer which is used to substitute traditional petrochemical-based polymer packaging films,the barrier properties of PLA films are still insufficient for high-barrier packaging *** this study,oxygen scavenger hydroxyl-terminated polybutadiene(HTPB)and co.alt salt catalyst were inco.porated into the PLA/poly(butylene adipate-co.terephthalate)(PLA/PBAT),followed by melting extrusion and three-layer co.extrusion blown film process to prepare the co.posite *** oxygen permeability co.fficient of the co.posite film co.bined with 6 wt%oxygen scavenger and 0.4 wt%catalyst was decreased significantly from 377.00 cc·mil·m^(-2)·day^(-1)·0.1 MPa^(-1) to 0.98 cc·mil·m^(-2)·day^(-1)·0.1 MPa^(-1),showing a remarkable enhancement of 384.69 times co.pared with the PLA/PBAT co.posite ***,the degradation behavior of the co.posite film was also accelerated,exhibiting a mass loss of nearly 60%of the original mass after seven days of degradation in an alkaline environment,whereas PLA/PBAT co.posite film only showed a mass loss of 32%.This work has successfully prepared PLA/PBAT co.posite films with simultaneously improved oxygen barrier property and degradation behavior,which has great potential for high-demanding green chemistry packaging industries,including food,agricultural,and military packaging.

关键词： Barrier property Oxygen scavenging Blow molding Eco.packaging Degradable co.posite film

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Super-high bed sintering for iron ores:variation and optimization of bed resistance

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Journal of Iron and Steel Research International 2025年第1期32卷 40-51页

作者： Liang-ping Xu Lin Xiong Hui-bo Liu Xi-duan Yang Ai-xiang Mao Pei-dun Chen Guang-hui Li School of Minerals Processing and Bioengineering Central South UniversityChangsha410083HunanChina Central Research Institute Baosteel Group Co.Ltd.Shanghai201900China Manufacturing Management Department Guangdong Zhongnan Iron and Steel Co.Ltd.Shaoguan512123GuangdongChina Technology and Development Center Shandong Taishan Iron and Steel Group Co.Ltd.Jinan271100ShandongChina

As the bed depth increases,sintering yield increases,but the productivity *** reveal the reasons for the decrease in productivity and explore targeted solutions,the bed resistance of mixtures,wet zone,and co.bustion zone was analyzed in the *** results showed that the decreased porosity of mixture resulted in the increased bed resistance by 160.56%when the bed depth increased from 600 to 1000 *** improving porosity of 1%by adding loosening bars with optimized size and distribution,the bed resistance decreased,and the productivity increased by 5%.The increase in bed depth increased the thickness of the wet zone from 120 to 680 mm and the resistance from 1.56 to 8.83 *** using a three-stage intensive mixer and pre-adding water for granulation,the moisture of mixture was reduced by 0.6%,and the sintering productivity increased by 4%.Besides,the high bed resistance is mainly caused by the increase in the thickness of the co.bustion zone from 31.9 to 132.7 mm,and the bed resistance increased from 0.70 to 5.62 *** bed resistance of the co.bustion zone at 900 mm was increased by 90.51%co.pared to 700 *** optimization of the distribution of co.e breeze,the thickness of co.bustion zone at the lower layer decreased from 132.7 to 106.84 mm and permeability improved significantly.

关键词： Super-high bed sintering Bed resistance Permeability Productivity Wet zone co.bustion zone

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