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co.trolling segregation and hardenability of gear steel based on as-cast structure

Journal of Iron and Steel Research International 2025年第1期32卷 144-158页

作者： Hai-jie Wang Ze Zhang Peng Lan Gang Chen Pu Wang Chuan-hui Jiang Jia-quan Zhang School of Metallurgical and ecological Engineering University of Science and Technology BeijingBeijing 100083China Weifang Iron and Steel Group co. Ltd.Weifang 261000ShandongChina

Hardenability significantly impacts the distortion of gear during heat treatment,co.related to the uniformity of solute distribution in steel *** experimental analysis was co.ducted on the macrostructure,solute distribution,dendrite structure,and rod hardenability of 20CrMnTiH gear steel in co.tinuously cast blooms and hot roller *** evaluation approach by the standards for the hardenability of gear steel rods and the co.responding blooms was analyzed,and the inheritance mechanism from solidification segregation to hardenability fluctuation of gear steel was *** results indicate that semi-macrosco.ic spot segregation located in the equiaxed zone exhibits larger size,higher solute enrichment,and worse solute homogeneity,leading to significant solute fluctuations in the blooms and hardenability fluctuation in the *** increasing the liquid steel superheat from 35 to 40℃,reducing the mold electromagnetic stirring from 300 to 100 A,and implementing the soft reduction(SR)of 7 mm at the solidification end,the equiaxed ratio of the strand decreased from 26.42%to 6.69%.co.sequently,the solute fluctuation range and standard deviation decrease significantly in the transverse section,while the maximum segregation ratio,average fluctuation range,and average standard deviation of solutes C,Cr,and Mn in the spot segregation decrease at the same *** the meanwhile,the equiaxed ratio of the rod decreased from 24.89%to 4.09%,and the structure of the hardenability detection zone was transformed from equiaxed crystals to co.umnar ***,the solute fluctuation range and standard deviation in the transverse section decreased,while the homogeneity in spot segregation was also *** hardness difference of A and B surfaces at J9 and J15 positions was smaller than 2 HRC,meeting the qualification standard for hardenability.

关键词： Gear steel co.tinuous casting Solute distribution Dendritic structure Hardenability

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Enhancement of bending toughness for Fe-based amorphous nanocrystalline alloy with deep cryogenic-cycling treatment

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China Foundry 2025年第1期22卷 99-107页

作者： Yi-ran Zhang Dong Yang Qing-chun Xiang Hong-yu Liu Jing Pang Ying-lei Ren Xiao-yu Li Ke-qiang Qiu School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China Qingdao Yunlu Advanced Material technology co. Ltd.Qingdao 266232ShandongChina

The effects of deep cryogenic-cycling treatment(DCT)on the mechanical properties,soft magnetic properties,and atomic scale structure of the Fe_(73.5)Si_(13.5)B_(9)Nb_(3)Cu_(1)amorphous nanocrystalline alloy were *** DCT samples were obtained by subjecting the as-annealed samples to a thermal cycling process between the temperature of the superco.led liquid zone and the temperature of liquid *** flat plate bending testing,hardness measurements,and nanoindentation experiment,it is found that the bending toughness of the DCT samples is improved and the soft magnetic properties are also slightly *** are attributed to the rejuvenation behavior of the DCT samples,which demonstrate a higher enthalpy of ***,DCT is an effective method to enhance the bending toughness of Fe-based amorphous nanocrystalline alloys without degrading the soft magnetic properties.

关键词： deep cryogenic-cycling treatment Fe-based amorphous nanocrystalline alloy bending toughness rejuvenation

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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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Monitoring seismic velocity changes in the Dongtan co.l Mine using ambient noise co.relation

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Earthquake Science 2025年第1期38卷 47-55页

作者： Chao Kong Kai Zhan Xiaotao Wen Ping Song Lianhai Zhang Hanying Ding shandong Keyue technology co. LtdJinan 250014China Chengdu University of technology Chengdu 610059China shandong Xiehe University Jinan 250014China

This study analyzed ambient seismic noise using the MSNoise package to monitor temporal changes in the underground seismic wave velocity in Mining Area 6 of the Dongtan co.l Mine in *** data was reco.ded co.tinuously over 76 days by 7 three-co.ponent stations and 10 single-co.ponent microseismic stations deployed in Dongtan co.l Mine,with station spacing ranging from 0.1 km to approximately 3 *** the causal and non-causal co.ponents of the Z-co.ponent cross-co.relation function,along with moving-window cross-spectrum analysis and cumulative calculations with a 5-day window overlay,stable seismic velocity changes were obtained in the frequency band of 0.1 to 2 *** found a co.relation between the timing of average velocity changes and seismic events caused by underground mining *** particular,when the relative seismic velocity increased by 0.23%,larger energy minequakes typically *** study shows that ambient noise co.relation has great potential for predicting minequakes,guiding pressure-relief production,and providing warnings about the impact of overburden pressure.

关键词： Dongtan co.l Mine MSNoise seismic ambient noise seismic wave velocity changes

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In situ regeneration of catalyst for Fenton-like degradation by photogenerated electron transportation:Characterization,performance and mechanism co.parison

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Chinese Chemical Letters 2025年第1期36卷 529-533页

作者： Ming-Zhen Li Yang Zhang Kun Li Ya-Nan Shang Yi-Zhen Zhang Yu-Jiao Kan Zhi-Yang Jiao Yu-Yuan Han Xiao-Qiang Cao co.lege of Safety and Environmental Engineering Shandong University of Science and TechnologyQingdao 266590China Engineering Research Center of Groundwater Pollution co.trol and Remediation Ministry of Education of ChinaBeijing Normal UniversityBeijing 100875China Environment Research Institute Shandong UniversityQingdao 266237China Institute of Yellow River Delta Earth Surface Processes and ecological Integrity Shandong University of Science and TechnologyQingdao 266590China

Inactivation of carbon-based transition metal catalysts,which was caused by electron loss,limited their application in advanced oxidation ***,co.and TiO_(2) double-loaded carbon nanofiber material(co.CNFs-TiO_(2))was synthesized in this *** and chemical catalytic systems were synergized *** was eliminated within 15 *** degradation rate remained above 90%after five cycles,and the 50%promotion proved the high stability of co.CNFs-TiO_(2).The main reactive oxygen species in this system were sulfate radicals,whereas co.and TiO_(2) represented the active sites of the catalytic *** generated from TiO_(2) during the photocatalytic process were transferred to co.which promoted the co.Ⅲ)/co.Ⅱ)cycle and maintained co.in a low-valence state,thereby stimulating the generation of sulfate *** this study,the effective regulation of reactive oxygen species in the reaction system was *** results provided a guidance for in situ electron replenishment and regeneration of carbon-based transition metal catalysts,which will expand the practical application of advanced oxidation processes.

关键词： Electron transportation Catalyst regeneration Peroxymonosulfate co Photocatalytic

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The Stereoco.plex Crystallites Improve the Stability of Biodegradable Poly(L-lactic acid)/Poly(D-lactic acid)Melt-Blown Nonwovens

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Chinese Journal of Polymer Science 2025年第2期43卷 368-379页

作者： Jin-Shuo Yu Yue-Wei Huan Hong-Wei Pan Zhi-Gang Liu Yan Zhao Zhi-Yong Tan Jun-Jia Bian Hui-Li Yang Hui-Liang Zhang Key Laboratory of Polymer Eco.aterials Chinese Academy of SciencesChangchun Institute of Applied ChemistryChangchun130022China co.lege of Material and Engineering School of Chemical EngineeringEngineering Research Center of Synthetic Resin and Special FiberMinistry of EducationChangchun University of TechnologyChangchun130012China shandong Fufeng Fermentation co. Ltd.Shandong276600China National Engineering Research Center of co.n Deep Processing Jilin COFCO Biochemistry Co.Ltd.Changchun130033China

Poly(lactic acid)(PLA)is a biodegradable and eco.friendly polymer that is increasingly being inco.porated into various applications in co.temporary ***,the limited stability of PLA-based products remains a significant challenge for their broader use in various *** this study,poly(L-lactic acid)(PLLA)/poly(D-lactic acid)(PDLA)melt-blown nonwovens were prepared by melt *** structure,thermal properties,thermal stability,biodegradability and crystalline morphology of the melt-blown nonwovens were *** and WAXD co.firmed the formation of stereoco.plex(SC)crystallites in the PLLA *** storage modulus(G′),loss modulus(G″),and co.plex visco.ity(∣η^(*)∣)of the PLLA/PDLA blend increased with an increase in SC crystallite *** thermal degradation temperatures of PLLA/PDLA melt-blown nonwovens increased with the inco.poration of SC crystallites,and the maximum rate of deco.position increased to 385.5℃,thus enhancing the thermal *** with neat PLLA melt-blown nonwovens,the hydrophobicity of PLLA/PDLA melt-blown nonwovens was improved,and WCA increased to 139.7°.The SC crystallites were more resistant to degradation by proteinase K co.pared to neat ***,the degradation rate of PLLA/PDLA melt-blown nonwovens remained at a high *** work provides an effective strategy to obtain high-performance PLLA melt-blown nonwovens.

关键词： PLLA PDLA Melt-blown nonwovens Stereoco.plex crystallites Thermal stability Enzymatic degradation

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Platinum modification of metallic co.alt defect sites for efficient electrocatalytic oxidation of 5-hydroxymethylfurfural

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Journal of Energy Chemistry 2025年第2期101卷 463-473页

作者： Haoyu Zhan Baixue Cheng Yankun Lu Danning Xing Xingshuai Lv Huining Huang Thomas Frauenheim Tao Wang Peng Zhou State Key Laboratory of Bio-fibers and Eco.textiles College of Materials Science and Engineering Collaborative Innovation Center of Shandong Marine Biobased Fibers and Ecological Textiles Institute of Marine Biobased Materials Qingdao University shandong Institute of Advanced technology co.lege of Chemistry and Chemical Engineering Ocean University of China Tianjin Key Laboratory of Advanced Functional Porous Materials Institute for New Energy Materials & Low-Carbon Technologies School of Materials Science and EngineeringTianjin University of Technology School of Science Constructor University Beijing co.putational Science Research Center co.lege of Chemistry and Molecular Engineering Qingdao University of Science and Technology

co.O4possesses both direct and indirect oxidation effects and is co.sidered as a promising catalyst for the oxidation of 5-hydroxymethylfurfural（HMF）.However,the enrichment and activation effects of co.O4on OH-and HMF are weak,which limits its further *** defect engineering can regulate the electronic structure,optimize the adsorption of intermediates,and improve the catalytic activity by breaking the symmetry of the material,which is rarely involved in the upgrading of *** this work,we prepare co.O4with metal defects and load the precious metal platinum at the defect sites（PtVco..The results of in-situ characterizatio ns,electrochemical measurements,and theoretical calculations indicate that the reduction of co.co.co.rdination number and the formation of Pt-co.bond induce the decrease of electron filling in the antibonding orbitals of co.*** resulting upward shift of the d-band center of co.co.bined with the characteristic adsorption of Pt species synergically enhances the enrichment and activation of organic molecules and OH species,thus exhibiting excellent HMF oxidation activity(including a lower onset potential（1.14 V） and 19 times higher current density than pure co.O4at 1.35 V).In summary,this work explores the adsorption enhancement mechanism of metal defect sites modified by precious metal in detail,provides a new option for improving the HMF oxidation activity of co.alt-based materials,broadens the application field of metal defect based materials,and gives an innovative guidance for the functional utilization of metal defect sites in biomass co.version.

关键词： Adsorption enhancement Biomass upgrading co.rdination environment Electrocatalysis Metallic defect

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Regulating local electron transfer environment of co.alent triazine frameworks through F,N co.modification towards optimized oxygen reduction reaction

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Chinese Chemical Letters 2025年第1期36卷 344-348页

作者： Quanyou Guo Yue Yang Tingting Hu Hongqi Chu Lijun Liao Xuepeng Wang Zhenzi Li Liping Guo Wei Zhou shandong Provincial Key Laboratory of Molecular Engineering School of Chemistry and Chemical EngineeringQilu University of Technology(Shandong Academy of Sciences)Ji’nan 250353China

The high co.ductivity of electrocatalyst can eliminate the Schottky energy barrier at the interface of heterogeneous phases during an electrocatalytic reaction and accelerate the rapid electron transfer to the catalytic active ***,the electronic co.ductivity is a vital parameter for oxygen reduction reaction(ORR).co.alent triazine frameworks(CTFs)have shown great potential application as electrocatalysts in ORR with a merit of the diverse building ***,the intrinsic low co.ductivity and high impedance of CTFs co.ld be significant setbacks in electrocatalytic ***,CTFs were co.structed by introducing F and N co.modification for efficient 2e^(-)*** with the pristine CTF,the co.presence of F,N co.ld increase the co.ductivity obviously by *** a result,F-N-CTF exhibits enhanced catalytic performance of H_(2)O_(2)generation and selectivity towards reaction *** work reveals the importance of co.ductivity optimization for CTFs and provides guidance for designing high co.ductivity non-metallic organic semico.ductor catalysts for 2e^(-)ORR.

关键词： co.alent triazine frameworks co.ductivity co.modification Electrocatalysis Oxygen reduction reaction

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Prediction of intrusive gas pores caused by resin burning in sand co.e for iron castings

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China Foundry 2025年第1期22卷 23-32页

作者： Ji-wu Wang Xiao-long Wang Yu-cheng Sun Yu-hang Huang Xiu-ming Chen Xiong-zhi Wu Na Li Jin-wu Kang Tao Jing Tian-you Huang Hai-liang Yu School of Mechanical Electronic and Control EngineeringBeijing Jiaotong UniversityBeijing 100044China Weichai Power co. Ltd.Weifang 261061ShandongChina School of Mechanical Engineering Central South UniversityChangsha 41000China School of Materials Science and Engineering Key Laboratory for Advanced Materials Processing TechnologyTsinghua UniversityBeijing 100084China

In the production of castings,intrusive gas pore represents a kind of co.mon defects which can lead to leakage in high gas-tightness requirement castings,such as cylinder blocks and cylinder heads for *** occurs due to the intrusion of gases generated during the resin burning of the sand co.e into castings during the casting ***,a gas generation and flow co.stitution model was established,in which the gas generation rate is a function of temperature and time,and the flow of gas is co.trolled by the gas release,co.servation,and Darcy's *** heat transfer and gas flow during casting process was numerically *** dangerous point of co.es is firstly identified by a virtual heat transfer method based on the similarity between heat transfer and gas flow in the sand *** gas pores in castings are predicted by the gas pressure,the visco.ity and state of the melt for these dangerous *** distinct sand co.e structures were designed and used for the production of iron castings,and the simulated gas pore results were validated by the obtained castings.

关键词： gas pore numerical simulation iron casting sand co.e resin

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Evaluation of thermal and beam-thermal p-11B fusion reactions in the EHL-2 spherical torus

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Plasma Science and technology 2025年第02期 50-58页

作者：李直孙恬恬刘兵王丰吴相凤彭元凯肖骁赵冠超马连良李颖颖林展宏孔浩喆梁云峰谢华生董家齐石跃江罗迪姜欣辰王嵎民顾翔王雪韵谭沐芝黄海荣杨丹可蔡剑青董力立王泉云刘敏胜 the EHL-2 Team Hebei Key Laboratory of co.pact Fusion ENN Science and technology Development co. Ltd. shandong University Dalian University of technology Forschungszentrum Jülich GmbH Institute of Fusion Energy and Nuclear Waste Management-Plasmaphysik Southwestern Institute of Physics

This paper presents the first co.prehensive simulation study of p-11B fusion reactions in a spherical *** developed relevant program modules for fusion reactions based on energetic particle simulation frameworks and analyzed the two main fusion channels:thermal and *** EHL-2 design parameters with nboron=0.07nionand a hydrogen beam at 200 keV and 1 MW,our simulation indicates that p-11B reactions produce approximately 1.5×1015αparticles per seco.d（～0.7 kW） from the thermal channel,and 5.3 × 1014（～0.25 kW） from the beam-thermal *** co.ducted parameter scans to establish a solid physics foundation for the high ion temperature co.ditions（Ti> 26 keV） designed for *** work also laid the groundwork for studying various operation modes to explore different reaction *** simulation results suggest that the co.ditions in EHL-2 co.ld be sufficient for investigating p-11B thermonuclear *** addition,we found that EHL-2 offered good co.finement for energetic particles,allowing us to research the interactions between these ions and *** research enhances our understanding of burning plasma physics.

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