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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

Thermal-flow-electric co.pling performance analysis of a liquid-immersed battery thermal management system

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Science China(Technological Sciences) 2025年第1期68卷 153-172页

作者： Qiang GAO Jun TIAN Chujin BAO Yangfan ZHONG Chengbin ZHANG Yongping CHEN School of Energy and Environment Southeast UniversityNanjing 210096China Battery Testing Center China North Vehicle Research InstituteBeijing 100072China zhejiang Immertech co. Ltd.Hangzhou 310000China Alibaba Cloud co.puting co. Ltd.Shenzhen 518100China

Ensuring the safety and performance of lithium-ion batteries(LIBs)is a significant challenge for electric *** tackle this issue,an innovative liquid-immersed battery thermal management system(LIBTMS)using bionic baffles with fish-like perforations is *** thermal-flow-electric co.pling characteristics of LIBTMSs with different baffle structures(no baffle,co.ventional baffle,baffle with circular perforations and baffle with fish-like perforations)are systematically investigated using experimental and numerical *** results indicate that the forced flow scheme exhibits better thermal management performance and voltage equalization than static ***,the LIB temperatures and voltage deviations of different LIBTMSs increase quickly with increasing discharge *** importantly,the innovative LIBTMS exhibits the best thermoelectric performance due to its excellent thermoelectric equilibrium behavior caused by high electrical and temperature co.sistency,as well as the best overall performance involving the balance between the pressure loss and heat transfer capacity of the *** with other structures,the innovative LIBTMS using baffles with fish-like perforations exhibits a maximum reduction of 10.1%,15.2%,25.8%and 9.0%in LIB maximum temperature,maximum temperature difference,system pressure drop and voltage deviation,respectively,under the same operating ***,for the LIBTMS using baffles with fish-like perforations,the bottom inlet and top outlet co.figuration and co.lant preco.ling are suggested to enhance co.ling performance.

关键词： baffle liquid-immersed thermoelectric performance lithium-ion battery battery thermal management

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Positive effect of Mo on mechanical properties of a Ni-42W-10co.xMo medium heavy alloy

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China Foundry 2025年第1期22卷 108-116页

作者： Guo-xin Cao Jian-xin Dong Yong-sheng He He Jiang Fang Hao Zhi-hua Nie Teng-fei Ma Bao-quan Fu School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Xi'an Superalloy Technology co. Ltd.Xi’an 710299China School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Key Laboratory of Air-driven Equipment Technology of zhejiang Province Quzhou UniversityQuzhou 324000ZhejiangChina

In this study,a novel Ni-W-co.Mo medium heavy alloy(MHA)was designed to improve its mechanical strength via Mo *** the Ni-42W-10co.x Mo alloy series,where x represents the weight percent of Mo and varies between 0,1,2,5,and 10,the microstructure transitions from a dendritic structure to a hypo-eutectic structure as the Mo co.tent increases from 0 to 5wt.%.Moreover,as the Mo co.tent increases from 0 to 10wt.%,the distribution of theμ-phase shifts from being individually dispersed to forming aggregates,and its volume fraction rises from 0.5%to 7.9%.Notably,theμ-phase evolves into an eutectic microstructure,which helps in minimizing the segregation of *** change is acco.panied by a substantial enhancement in mechanical properties;specifically,the co.pressive yield strength at room temperature increases from 350 MPa to 646 MPa,indicating a significant 85%***,the microhardness increases from 230 HV to 304 *** dynamics simulations further reveal that the strengthening mechanism of Ni-42W-10co.x Mo alloys is Mo-induced solid solution strengthening and precipitation strengthening.

关键词： medium-heavy alloys Ni-based alloy mechanical properties solid solution strengthening precipitation strengthening

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co.relation between grain size,mechanical properties and deformed microstructure of Fe-20Mn-6Al-0.6C-0.15Si low-density steel

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Journal of Iron and Steel Research International 2025年第1期32卷 282-292页

作者： Qi Zhang Guang-hui Chen Zheng-liang Xue Zheng-kun Chen Guang Xu State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan430081HubeiChina Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and TechnologyWuhan430081HubeiChina Red Eagle Novel Refractory Materials Research Institute Zhejiang Red Eagle Group Co.Ltd.Huzhou313000ZhejiangChina

The effects of austenite grain size on the deformed microstructure and mechanical properties of an Fe-20Mn-6Al-0.6C-0.15Si(wt.%)low-density steel were *** microstructure of the experimental steel after solution treatment was single austenitic *** austenite grain size increased with solution temperature and time.A model was established to show the relationship between temperature,time and austenite grain size for the experimental *** addition,as the solution temperature increased,the strength decreased,while the elongation first increased and then *** decrease in elongation after solution treatment at 1100℃ for 90 min is co.tributed to the over-co.rse austenite ***,after solution treatment at 900℃ for 90 min,the strength-elongation product reached the highest value of 44.4 GPa%.As the austenite grain size increased,the intensity of//tensile direction fiber *** was acco.panied by a decrease in dislocation density,resulting in a lower fraction of low-angle grain boundaries and a lower work hardening ***,the austenite grain size has a critical influence on the mechanical properties of the low-density *** grains lead to a lower yield strength due to the Hall-Petch effect and a lower tensile strength because of lower dislocation strengthening.

关键词： Austenitic low-density steel Solution treatment Grain size Mechanical property Deformed microstructure

Vibration safety assessment and parameter analysis of buried oil pipelines based on vibration isolation holes under strong surface impact

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Earthquake Engineering and Engineering Vibration 2025年第1期24卷 69-82页

作者： Wang Guobo Mei Hua Wang Jianning He Wei Yin Yao Zhai Yuxin Zuo Pengfei co.lege of Civil Engineering and Architecture Wenzhou UniversityWenzhou 325035China zhejiang Engineering Research Center of Disaster Prevention and Mitigation for co.stal Soft Soil Foundation WenZhou 325035China China National Machinery Industry co. Ltd.Beijing 100080China Faculty of Engineering China University of GeosciencesWuhan 430074China China Railway co.struction Group co. Ltd.Beijing 100072China School of Civil Engineering and Architecture Wuhan University of TechnologyWuhan 430070China

Strong surface impact will produce strong vibration,which will pose a threat to the safety of nearby buried pipelines and other important lifeline *** on the verified numerical method,a co.prehensive numerical parameter analysis is co.ducted on the key influencing factors of the vibration isolation hole(VIH),which include hole diameter,hole net spacing,hole depth,hole number,hole arrangement,and soil *** results indicate that a smaller ratio of net spacing to hole diameter,the deeper the hole,the multi-row hole,the hole adoption of staggered arrangements,and better site soil co.ditions can enhance the efficiency of the VIH *** average maximum vibration reduction efficiency within the vibration isolation area can reach 42.2%.The vibration safety of adjacent oil pipelines during a dynamic co.paction projection was evaluated acco.ding to existing standards,and the measurement of the VIH was reco.mended to reduce excessive *** single-row vibration isolation scheme and three-row staggered arrangement with the same hole parameters are suggested acco.ding to different *** research findings can serve as a reference for the vibration safety analysis,assessment,and co.trol of adjacent underground facilities under the influence of strong surface impact loads.

关键词： vibration isolation hole buried oil pipeline strong surface impact vibration velocity vibration safety assessment

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Nickel-co.per alloying arrays realizing efficient co.electrosynthesis of adipic acid and hydrogen

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Journal of Energy Chemistry 2025年第02期101卷 7-15页

作者： Xuhui Ren Qianyu Zhang Yun Tong Guorong Zhou co.g Lin Yanying Zhao Pengzuo Chen School of Chemistry and Chemical Engineering Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province Zhejiang Sci-Tech University

co.structing electrocatalytic overall reaction technology to co.ple the electrosynthesis of adipic acid with energy-saving hydrogen production is of significant for sustainable energy ***,the development of highly-active bifunctional electrocatalysts remains a ***,3D hierarchical nickel-co.per alloying arrays with dendritic morphology are manufactured by a simple electrodeposition process,standing for the excellent bifunctional electrocatalyst towards the co.production of adipic acid and H2from cyclohexanone and *** membrane-free flow electrolyzer of Cu0.81Ni0.19/NF shows the superior electrooxidation performance of ketone-alco.ol（KA） oil with high faradaic efficiencies of over 90% for adipic acid and H2,robust stability over 200 h as well as a high yield of 0.6 mmol h-1for adipic acid at 100 mA ***-situ spectrosco.y indicates the Cu0.81Ni0.19alloy co.tributes to forming more active NiOOH species to involve in the co.version of cyclohexanone to adipic acid,while the proposed reaction pathway undergoes the 2-hydroxycyclohexanone and 2,7-oxepanedione ***,the theoretical calculations co.firm that the optimal electronic interaction,boosted reaction kinetics as well as improved adsorption free energy of reaction intermediates,synergistically endows Cu0.81Ni0.19alloy with superior bifunctional performance.

关键词： Adipic acid Cu0.81Ni0.19 alloy Cyclohexanone oxidation reaction Hydrogen evolution reaction Hydrogen fuel

Influence of ultrafine cement on cement-soil in peat soil environment of Dianchi Lake

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土木与环境工程学报(中英文) 2025年第2期47卷 1-12页

作者： CAO Jing SUN Huafeng HUANG Siyang KONG Cheng LIU Fangyi LIU Fuhua TIAN Lin ZHU Weiming Faculty of Civil Engineering and Mechanics Kunming University of Science and TechnologyKunming 650500P.R.China China Power co.struction Group Kunming Survey Design&Research Institute co. LtdKunming 650500P.R.China zhejiang Wanning Technology co. LtdHangzhou 310000P.R.China

Treatment of peat soil foundation in Yunnan surrounding Dianchi and Erhai Lakes poses co.plex problems for engineering *** is insufficient to rely on ordinary cement to reinforce peat *** order to make the reinforcement reliable,this experiment mixed(ultrafine cement)UFC into ordinary cement to form a co.posite solidify *** study aimed to analyze the influence of UFC proportion on the strength of cement-soil in the peat soil *** co.pressive strength(UCS)and scanning electron microsco.e(SEM)tests were co.ducted on samples soaked for 28 and 90 days,*** test results show that without co.sidering the effects of Humic Acid(HA)and Fulvic Acid(FA),inco.porating UFC can significantly improve the UCS of *** rapid hydration of the fine particles generates a large number of cementitious products,improves the co.esion of the soil skeleton,and fills the ***,when the proportion of UFC increases,the aggregate structure formed by a larger quantity of fine particles reduces the hydration rate and degree of cement hydration,making the UCS growth rate of cement-soil *** the peat soil environment,HA significantly weakened the UCS of cement-soil in both physical and chemical ***,UFC can mitigate the adverse effect of HA on cement-soil by its small particle size,high surface energy,and solid binding *** addition,FA has a positive effect on the UCS of cement-soil soaked for 28 days and 90 *** UFC addition co.ld promote the enhancement effect of FA on cement-soil *** test results showed that cement hydration products increased significantly with the increase of UFC proportion,and cementation between hydration products and soil particles was *** size and co.nectivity of cement-soil pores were significantly reduced,thereby improving cement-soil structural integrity.

关键词： peat soil environment ultrafine cement(UFC) cement-soil strength test microstructure

Charge polarity inversion and zinco.hilicity improvement for chitosan separator towards durable aqueous zinc-ion batteries

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Journal of Energy Chemistry 2025年第2期101卷 110-119页

作者： Jiaqi Yu Bo Liu Hong Ma Zehua Fan Xiang Han Qinghua Tian Jizhang Chen co.Innovation Center of Efficient Processing and Utilization of Forest Resources College of Materials Science and Engineering Nanjing Forestry University co.lege of Mathematics and Physics Jinggangshan University Key Laboratory of Surface & Interface Science of Polymer Materials of zhejiang Province School of Chemistry and Chemical Engineering Zhejiang Sci-Tech University

Aqueous zinc-ion batteries enco.nter enormous challenges such as Zn dendrites and parasitic *** modification is a highly effective strategy to address these *** the advantages of low co.t,nontoxicity,biodegradability,good film-forming ability,superior hydro phi licity,and rich functional groups,chitosan is an ideal matrix for co.structing ***,the presence of positive charges within chitosan in weakly acidic electrolytes is unfavorable for dendrite ***,Schiff base reaction is introduced to modify chitosan matrix,transforming its charge polarity from positive to ***,NbN with excellent zinco.hilicity is co.ted onto chitosan matrix,forming a Janus separator with low thickness of 19 μm and co.siderably improved mechanical *** resultant separator can promote the transport of Zn2+ions while triggering a repulsive shielding effect against anions,therefore dramatically enhancing Zn2+ion transfer number from 0.28 to *** separator can also facilitate desolvation process,improve exchange current density,restrict two-dimensional Zn2+ion diffusion,and enhance electrochemical kinetics,co.tributing to significantly inhibited dendrite growth,by-product formation,and hydrogen ***,stable and reversible Zn stripping/plating process is enabled for over 2500 h at 2 mA cm-2and 2 mAh *** great rate capability and excellent cyclability can be achieved for full batteries even under harsh *** work provides new insights into separator design for Zn-based batteries.

关键词： Aqueous zinc-ion batteries Charge polarity regulation Chitosan utilization Dendrite inhibition Separator modification

Characteristics of catalytic destruction of dichloromethane and ethyl acetate mixture over HxPO4-RuOx/CeO2 catalyst

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Journal of Environmental Sciences 2025年第2期148卷 336-349页

作者： Jiawen Chen Qingjie Meng Feng Bi Jingkun Chen Xiaole Weng Zhongbiao Wu Key Laboratory of Environment Remediation and Eco.ogical Health Ministry of EducationCollege of Environmental and Resource SciencesZhejiang UniversityHangzhou 310058China School of Civil&Environmental Engineering and Geography Science Ningbo UniversityNingbo 315211China ZJU-Hangzhou Global Scientific and Technological Innovation Center Hangzhou 311200China zhejiang Provincial Engineering Research Centre of industrial Boiler&Furnace Flue Gas Pollution co.trol Hangzhou 310058China

Catalytic destruction is an ascendant technology for the abatement of volatile organic co.pounds(VOCs)originating fromsolvent-based industrial *** varied co.position tends to influence each VOC’s catalytic behavior in the reaction *** investigated the catalytic destruction of multi-co.ponent VOCs including dichloromethane(DCM)and ethyl acetate(EA),as representatives from pharmaceutical waste gases,over co.supported HxPO_(4)-RuOx/CeO_(2) catalyst.A mutual inhibitory effect relating to co.centrations because of co.petitive adsorption was verified in the binary VOCs oxidation and EA posed a more negative effect on DCM oxidation owing to EA’s superior adsorption *** adsorption of EA on acidic sites(HxPO_(4)/CeO_(2))promoted DCM activation on basic sites(O^(2−))and the dominating EA oxidation blocked DCM’s access to oxidation centers(RuOx/CeO_(2)),resulting in boosted monochloromethane yield and increased chlorine deposition for DCM *** impaired redox ability of Ru species owing to chlorine deposition in turn jeopardized deep oxidation of EA and its by-products,leading to increased gaseous by-products such as acetic acid originating fromEA ***,DCM at low co.centration slightly promoted EA co.version at low temperatures with or without water,co.sistent with the enhanced EA adsorption in co.adsorption *** was mainly due to that DCM impeded the shielding effect of hydrolysate deposition from rapid EA hydrolysis depending on the decreased ***,water benefited EA hydrolysis but decreased co.(2) selectivity while the generated water derived from EA was likely to affect DCM *** work may provide theoretical guidance for the promotion of applied catalysts toward industrial applications.

关键词： Catalytic destruction Multi-co.ponent VOCs Mixture effect Interaction mechanism