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Banded structure control of low carbon microalloyed steel based on oxide metallurgy

Journal of Iron and Steel Research(International) 2023年第11期30卷 2242-2253页

作者： Yong-kun Yang Jia-yu Zhu Xiao-ming Li Yang Wang Dong-ping Zhan School of Metallurgical Engineering Xi’an University of Architecture and TechnologyXi’an710055ShaanxiChina School of Metallurgy Northeastern UniversityShenyang110819LiaoningChina

Banded structure is a common harmful microstructure for low carbon microalloyed steel,which seriously shortens the service life of processed parts.In order to study the effect of oxide metallurgy on improving banded structure,the Ti-Zr deoxidized low carbon microalloyed steel that can play the oxide metallurgical role of inclusion was chosen as the research object,and the inclusion characteristics,microstructure and transverse and longitudinal mechanical properties after hot rolling were analyzed.The results showed the inclusion number density increased in all experimental steels after hot rolling,and a large number of long strip inclusions with aspect ratio greater than 3 appeared along the rolling direction.In addition,after hot rolling,there were element segregation bands in the experimental steels,and granular bainite bands were formed in the element enrichment zone.However,the intragranular ferrite generated in the cooling process destroyed the continuity of granular bainite bands,so that the microstructure anisotropy indexes of experimental steels were small.The mechanical properties analysis showed that the anisotropy of performance was mainly reflected in plasticity and toughness in the experimental steels.Among them,the difference ratio of elongation,section shrinkage and impact energy of No.2 steel was 1.69%,3.87% and 1.69%,respectively,which were less than those of No.1 steel and No.3 steel.The anisotropy of microstructure and mechanical properties of No.2 steel that full played the role of oxide metallurgy were improved,and the banded structure control of low carbon microalloyed steel can be realized by oxide metallurgy technology.

关键词： Low carbon microalloyed steel Hot rolling Banded structure Oxide metallurgy Intragranular ferrite

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Forward Expansiveness and Entropies for Subsystems of Z+k-actions

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Acta Mathematica Sinica,English Series 2023年第4期39卷 633-662页

作者： Yao jia GUO Xin Sheng WANG yu Jun zhu School of Mathematical Sciences Xiamen University

In this paper,forward expansiveness and entropies of "subsystems"2) of Z+k-actions are investigated.Let α be a Z+k-action on a compact metric space.For each 1 ≤j≤k-1,denote Gj+={V+:=V ∩R+k:V is a j-dimensional subspace of Rk}.We consider the forward expansiveness and entropies for α along V+∈ Gj+.Adapting the technique of "coding",which was introduced by M.Boyle and D.Lind to investigate expansive subdynamics of Zk-actions,to the Z+kcases,we show that the set Ej+(α) of forward expansive j-dimensional V+is open in Gj+.The topological entropy and measure-theoretic entropy of j-dimensional subsystems of α are both continuous in Ej+(α),and moreover,a variational principle relating them is obtained.For a 1-dimensional ray L ∈G1+,we relate the 1-dimensional subsystem of α along L to an i.***.d.random transformation.Applying the techniques of random dynamical systems we investigate the entropy theory of 1-dimensional subsystems.In particular,we propose the notion of preimage entropy(including topological and measure-theoretical versions) via the preimage structure of α along L.We show that the preimage entropy coincides with the classical entropy along any L ∈E1+(α) for topological and measure-theoretical versions respectively.Meanwhile,a formula relating the measure-theoretical directional preimage entropy and the folding entropy of the generators is obtained.

关键词： ℤ k + -action forward expansiveness j -dimensional subsystems entropy preimage entropy folding entropy variational principle random transformation 37A35 37B40

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Evolution of inclusion and microstructure in Ti-Zr deoxidized steel during hot compression

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Journal of Iron and Steel Research(International) 2023年第10期30卷 1987-1999页

作者： Yong-kun Yang Jia-yu Zhu Xiao-ming Li Yang Wang Cheng-jun Liu Dong-ping Zhan School of Metallurgical Engineering Xi'an University of Architecture and TechnologyXi'an 710055ShaanxiChina Key Laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education) Northeastern UniversityShenyang 110819LiaoningChina School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina

The effects of different hot deformation amounts on the evolution of inclusion and microstructure in Ti-Zr deoxidized steel were studied by utilizing the Thermecmaster-Z hot simulation test machine,automatic scanning electron microscope equipped with energy-dispersive spectrometer,and electron backscattered diffraction.The results indicated that hot deformation amount has no significant effect on the number density of oxide,but the MnS that precipitated on the Ti-Zr oxide surface undergoes extension and breakage,resulting in the changes in oxide aspect ratio.Moreover,the fracture of nitride mainly occurs in the sample with the second pass deformation amount of 42.9%and 71.4%,and the degree of fragmentation of nitride is more serious with the deformation amount increasing.During the hot compression,sulfide undergoes breakage and extension,and with the second pass deformation amount increasing,the breakage and extension of sulfide present a periodic change.Finally,with the increase in hot compression amount,the ferrite types in microstructure change from acicular ferrite and bainitic ferrite to polygonal ferrite,and the ferrite grain size is refined.When the total deformation amount increases from 30%to 80%,the ferrite grain sizes of grain boundary with the misorientation of 4°and 15°decrease from 4.14 and 5.67μm to 3.47 and 4.40μm,respectively.However,when the total deformation amount increases to 80%,the harmful ferrite/pearlite banded structure appears in the micro structure.Refining ferrite grain size and avoiding harmful microstructure are the key for the optimization of hot compression process.

关键词： Hot compression Oxide Nitride Sulfide Microstructure Grain size Ti-Zr deoxidized steel

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Macroscopic electromagnetic synergy network-enhanced N-doped Ni/C gigahertz microwave absorber with regulable microtopography

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Nano Research 2023年第7期16卷 10666-10677页

作者： yuelei Pan Qianqian zhu jiahui zhu yuhang Cheng Bowen yu Zirui jia Guanglei Wu Institute of Materials for Energy and Environment State Key Laboratory of Bio-fibers and Eco-textilesCollege of Materials Science and EngineeringQingdao UniversityQingdao 266071China College of Chemistry and Chemical Engineering Qingdao UniversityQingdao 266071China

To achieve excellent electromagnetic wave(EMW)absorption properties,the microstructure design of the absorber is critical.In this work,six kinds of N-Ni/C nanostructures with different morphologies were prepared by one-step hydrothermal method and high temperature carbonization by adjusting the types of nickel salts and reaction solvents.The EMW absorption performance of six different morphologies of N-Ni/C nanostructures was compared and analyzed.Among them,it is found that the nanoflowerlike N-Ni/C composite has excellent dielectric loss and magnetic loss synergistic effect due to its polycrystalline structure,and can obtain excellent EMW absorption performance.The minimum reflection loss value at a thickness of 1.9 mm is-59.56 dB at 16.88 GHz,and the effective absorption bandwidth value reaches 6.0 GHz at a thickness of 2.2 mm.Our research shows that different morphologies and multiple lattice structures of nanostructures with the same composition have a significant influence on EMW absorption performance,which provides new research ideas for developing high-performance EMW absorbing materials.

关键词： magnetic metal-carbon binary composition morphology control dielectric loss magnetic loss electromagnetic wave absorption

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Unique electromagnetic wave absorber for three-dimensional framework engineering with copious heterostructures

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Journal of Materials Science & Technology 2024年第3期170卷 129-139页

作者： Liyuan yu Qianqian zhu Zhiqiang Guo yuhang Cheng Zirui jia Guanglei Wu Institute of Materials for Energy and Environment State Key Laboratory of Bio-fibers and Eco-textilesCollege of Materials Science and EngineeringQingdao UniversityQingdao 266071China College of Chemistry and Chemical Engineering Qingdao UniversityQingdao 266071China

In order to obtain high-performance electromagnetic wave absorbers,the adjustment of structure and components is essential.Based on the above requirements,this system forms a three-dimensional frame structure consisting of MXene and transition metal oxides(TMOs)through efficient electrostatic self-assembly.This three-dimensional network structure has rich heterojunction structures,which can cause a large amount of interface polarization and conduction losses in incident electromagnetic waves.Hollow structures cause multiple reflections and scattering of electromagnetic waves,which is also an important reason for further increasing electromagnetic wave losses.When the doping ratio is 1:1,the system has the best impedance matching,the maximum effective absorption bandwidth(EAB max)can reach 5.12 GHz at 1.7 mm,and the minimum reflection loss(RL min)is-50.30 dB at 1.8 mm.This provides a reference for the subsequent formation of 2D-MXene materials into 3D materials.

关键词： MXene Three-dimensional frame Heterojunction structure Conduction loss Electromagnetic wave absorption

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A chiral salen-Co(Ⅱ)complex as soluble redox mediator for promoting the electrochemical performance of Li-O_(2) batteries

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Nano Research 2022年第9期15卷 8101-8108页

作者： Hao Wan Yingjie Sun jia yu Qianqi Shi Yongchun zhu Yitai Qian Hefei National Laboratory for Physical Science at Microscale and Department of Chemistry University of Science and Technology of ChinaHefei 230026China Hebei Key Laboratory of Photoelectric Control on Surface and Interface College of ScienceHebei University of Science and TechnologyShijiazhuang 050018China Materials Genome Institute Shanghai UniversityShanghai 200444China

Low discharge capacity and poor cycle stability are the major obstacles hindering the operation of Li-O_(2)batteries with highenergy-density.These obstacles are mainly caused by the cathode passivation behaviours and the accumulation of by-products.Promoting the discharge process in solution and accelerating the decomposition of discharge products and by-products are able to alleviate above problems to some extent.Herein,chiral salen-Co(Ⅱ)complex,(1R,2R)-(-)-N,N-bis(3,5-di-t-butylsalicylidene)-1,2-cyclohexanediaminocobalt(Ⅱ)(Co(Ⅱ))as a multi-functional redox mediator was introduced into electrolyte to induce solution phase formation of Li_(2)O_(2)and catalyze the oxidation of Li_(2)O_(2)and main by-products Li_(2)CO3.Due to the Co(Ⅱ)has the solvation effect towards Li+,it can drive solution phase formation of Li_(2)O_(2),to prevent electrode from passivation and then increase the discharge capacity with a high Li_(2)O_(2)yield of 96.09%.Furthermore,the Co(Ⅱ)possesses suitable redox couple potentials,and it does so while simultaneously boosting the oxidization of Li_(2)O_(2)and the decomposition of Li_(2)CO3,reducing charge overpotential,and promoting cycle lifespan.Thereby,a cell with Co(Ⅱ)achieved a long cycling stability at low charge plateau(3.66 V)over 252 cycles with a specific capacity of 500 mAh·gcarbon^(−1).

关键词： chiral salen-Co(Ⅱ)complex soluble redox mediator multi-redox potential trifunctional Li-O_(2)batteries

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A prognostic four-gene signature and a therapeutic strategy for hepatocellular carcinoma:Construction and analysis of a circRNA-mediated competing endogenous RNA network

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Hepatobiliary & Pancreatic Diseases International 2024年第3期23卷 272-287页

作者： Hai-Yan Zhang jia-Jie zhu Zong-Ming Liu yu-Xuan Zhang jia-jia Chen Ke-Da Chen Zhejiang Chinese Medical University Hangzhou 310053China Shulan International Medical College Zhejiang Shuren UniversityHangzhou 310015China State Key Laboratory for Diagnosis and Treatment of Infectious Diseases National Clinical Research Center for Infectious DiseasesNational Medical Center for Infectious DiseasesCollaborative Innovation Center for Diagnosis and Treatment of Infectious DiseasesThe First Affiliated HospitalZhejiang University School of MedicineHangzhou 310009China

Background:Hepatocellular carcinoma(HCC)has a poor long-term prognosis.The competition of circular RNAs(circRNAs)with endogenous RNA is a novel tool for predicting HCC prognosis.Based on the alterations of circRNA regulatory networks,the analysis of gene modules related to HCC is feasible.Methods:Multiple expression datasets and RNA element targeting prediction tools were used to construct a circRNA-microRNA-mRNA network in HCC.Gene function,pathway,and protein interaction analyses were performed for the differentially expressed genes(DEGs)in this regulatory network.In the proteinprotein interaction network,hub genes were identified and subjected to regression analysis,producing an optimized four-gene signature for prognostic risk stratification in HCC patients.Anti-HCC drugs were excavated by assessing the DEGs between the low-and high-risk groups.A circRNA-microRNA-hub gene subnetwork was constructed,in which three hallmark genes,KIF4A,CCNA2,and PBK,were subjected to functional enrichment analysis.Results:A four-gene signature(KIF4A,CCNA2,PBK,and ZWINT)that effectively estimated the overall survival and aided in prognostic risk assessment in the The Cancer Genome Atlas(TCGA)cohort and International Cancer Genome Consortium(ICGC)cohort was developed.CDK inhibitors,PI3K inhibitors,HDAC inhibitors,and EGFR inhibitors were predicted as four potential mechanisms of drug action(MOA)in high-risk HCC patients.Subsequent analysis has revealed that PBK,CCNA2,and KIF4A play a crucial role in regulating the tumor microenvironment by promoting immune cell invasion,regulating microsatellite instability(MSI),and exerting an impact on HCC progression.Conclusions:The present study highlights the role of the circRNA-related regulatory network,identifies a four-gene prognostic signature and biomarkers,and further identifies novel therapy for HCC.

关键词： Hepatocellular carcinoma circRNA-related ceRNA network Biomarker Least absolute shrinkage and selection operator Bioinformatics

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A review of research on central crack in continuous casting strand

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Journal of Iron and Steel Research(International) 2023年第6期30卷 1073-1089页

作者： Yong-kun Yang Jia-yu Zhu Wei-an Wang Yang Wang jian-li Wang Guan-jie Wang Xiao-ming Li School of Metallurgical Engineering Xi’an University of Architecture and TechnologyXi’an 710055ShaanxiChina

Central crack is a common quality defect in continuous casting strand,which is difficult to fully weld in the rolling and forging processes,and has become a key technical problem that restricts the stable production of high-end alloy rod/forging/pipe.In recent years,the central crack control has been one of the main focuses in high quality steel research.In order to fully understand the central crack,the research status of central crack characteristics,formation mechanism,influencing factors,and control methods in the world was reviewed.The deficiencies in the research of the central crack and the key research directions in the future were pointed out,which will provide references for other scholars in this field of research.It is found that alloying elements segregation during solidification and inclusions precipitated at grain boundaries are the main reasons for the central crack formation,while the unreasonable application of production processes can also induce the initiation of central crack.The optimization of alloying element composition and production process is helpful to reduce the initiation of central cracks.In addition,the quantitative characterization mechanism based on steel grades,temperature,stress,and other factors induced central crack should be established in the further study,forming a systematic quantitative determination criterion and control strategy for coupling the composition,process and thermal/mechanical characteristic.

关键词： Central crack Continuous casting strand Formation mechanism Alloying element Control strategy

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FERONIA cytoplasmic domain:node of varied signal outputs

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aBIOTECH 2020年第2期1卷 135-146页

作者： jia Chen Sirui zhu Zhenhua Ming Xuanming Liu Feng yu State Key Laboratory of Chemo/Biosensing and Chemometrics College of BiologyHunan Key Laboratory of Plant Functional Genomics and Developmental RegulationHunan UniversityChangsha 410082P.R.China State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources College of Life Science and TechnologyGuangxi UniversityNanning 530004P.R.China

The receptor-like kinase(RLK)FERONIA(FER),located on the plasma membrane,belongs to the Catharanthus roseus RLK1-like kinase family(CrRLK1L)and participates in widespread biological processes in plants in a context-dependent fashion.Genetic studies in Arabidopsis illustrated the versatile roles that FER plays in fertilization,vegetative growth,defense and stress responses,cell-wall homeostasis,as well as protein synthesis.These studies also helped to identify genes and signal pathways involved in FER signal transduction.Despite increasingly larger numbers of studies discussing how FER senses its ligand,Rapid alkalinization factor(RALF)peptides,and further regulates downstream factors,few have shown the mechanisms of how FER mediates the specific regulation of downstream signals in context of the phosphorylation of its cytoplasmic domain.As understanding this would help in better understanding the diversity and complexity of FER function,this paper aims to review the roles of FER in regulating different signal outputs from the view of the role of its cytoplasmic domain.

关键词： FER Cytoplasmic domain Phosphorylation sites Kinase activity RALF peptides

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Experimental study on anti-penetration mechanism of bolted composite protective structure with limited span under impact of low-velocity projectile

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Defence Technology（防务技术） 2022年第6期18卷 995-1005页

作者： yu-jia Liu Dian Li Hai-liang Hou zhu-jie Zhao yue Xie College of Naval Architecture and Ocean Engineering Naval University of EngineeringWuhan430033China

In order to study the influence of the bolt joint mode on low-velocity projectiles penetrating the composite protective structure,two bolt joint models which connect the composite target to the fixed frame were designed,the ballistic test of the bolted composite protective structure with limited span was carried out,and the bearing and failure characteristics of the bolted region,as well as the energy dissipation of each part of the structure,were analyzed.The results show that in the condition of lowvelocity impact,there are three failure modes for the bolted composite protective structure subjected to projectile penetration,including failure of the impact point of the composite target,failure of protective structure connecting components and failure of the holes in the bolted region of the composite target;the failure mode of bolt holes in the bolted region has a great influence on the protection performance,and the allowable value of the bearing capacity of the bolted region depends on the sum of the minimum failure load in the failure modes and the friction force;shear-out failure occurring in the bolt holes in the bolted region exerts the greatest effect on ballistic performance,which should be avoided;When simultaneous failure occurs in the bolted region and the free deformation region of the composite protective structure,the energy absorption per unit surface density of the composite protective structure reaches the maximum,which can give full play to its anti-penetration efficiency.

关键词： Impact dynamics Composite protective structure Bolt joint Ballistic test Failure modes

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