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International Journal of Minerals,metallurgy and materials 2020年第11期27卷 1525-1535页

作者： Hong-mei Zhang Yan Li Ling Yan Fang-fang Ai Yang-yang Zhu Zheng-yi Jiang School of material and metallurgy University of Science and Technology LiaoningAnshan 114051China state key laboratory of metal material for marine equipment and application Anshan Iron and Steel Research Institute of AnGang GroupAnshan 114009China School of Mechanical Materials and Mechatronic EngineeringUniversity of WollongongWollongong NSW 2522Australia

To simulate the wear and corrosion behavior of high-strength EH47 hull steel in a complicated marine environment in which seawater,sea ice,and sea sand coexist,accelerated wear and corrosion tests were performed in a laboratory setting using a *** effect of large loads on the behavior of abrasion and corrosion in a 3.5wt%NaCl solution with ice and sand to simulate a marine environment were *** experimental results showed that the coefficient of friction(COF)decreases with increasing working load;meanwhile,the loading force and sand on the disk strongly influence the *** mechanisms of friction and the coupling effect of abrasion and corrosion in the 3.5wt%NaCl solution with sand were the wear and corrosion mechanisms;furthermore,the wear mechanism exerted the predominant effect.

关键词： friction marine environment wear mechanism tribological tests

Complex Precipitation Mechanism of Ti-Nb-V Microalloyed Bainitic Base High Strength Steel

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Journal of Wuhan University of Technology(materials Science) 2019年第6期34卷 1444-1450页

作者：庞启航郭菁 LI Weijuan TANG Di ZHAO Zhengzhi QI Huan WANG Jiaji School of materials and metallurgy University of Science and Technology LiaoningAnshan 114051China state key laboratory of metal material for marine equipment and application Anshan 114009China Engineering Research Institute University of Science and Technology BeijingBeijing 100083China

The addition of high Ti(>0.1%) in microalloyed bainitic high strength steel was designed, and the precipitation morphology of steels with different Ti, Nb, and V contents was studied by utilizing transmission electron microscopy(TEM). Based on the classical nucleation-crystal growth theory and the Johnson-Mehl-Avrami equation, the precipitation thermodynamic and kinetic model of second phase particles in austenite was established in the form of(Nbx,Vy,Tiz)C, and the complex precipitation mechanism of second phase particles was emphatically studied. The experimental results show that the complex precipitation particles could be divided into two categories: the coarser particles with about 100 nm grain size and the independent complex precipitation particles in the form of(Nb,V,Ti)C with 35-50 nm grain size. The latter has a better precipitation strengthening effect, and the calculated PTT curve shows a typical "C" shape. When the deformed storage energy is 3 820 J·mol^-1, the fastest precipitation temperature of calculated PTT curve is 925℃, and the calculated result is essentially consistent with experimental values. The increase of Ti content increased the nose point temperature and expanded the range of fastest precipitation temperature.

关键词： bainite base high strength steel therm odynamic and dynamic complex precipitation behavior precipitation morphology

Effect of Rare Earth and Cooling Process on Microstructure and Mechanical Properties of an Ultra-Cleaned X80 Pipeline Steel

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Acta metallurgica Sinica(English Letters) 2021年第5期34卷 639-648页

作者： He Duan Yi-Yin Shan Ke Yang Xian-Bo Shi Wei Yan Yi Ren Institute of metal Research Chinese Academy of SciencesShenyang110016China School of materials Science and Engineering University of Science and Technology of ChinaShenyang110016China state key laboratory of metal materials and application for marine equipment Anshan114009China

In order to explore the eff ect of a small amount of rare earth addition in ultra-cleaned pipeline steel and the influence of the cooling process on the tensile and impact properties,three API X80 pipeline steels were fabricated by varying RE addition and the cooling process at the same *** microstructures with different features for a low C high Nb microalloyed high-strength pipeline steel and the corresponding mechanical properties were *** results showed that even in the ultra-cleaned steel with O and S contents less than 10 ppm,the addition of RE would still cause an increase in the volume fraction of inclusions consisting of complicated RE oxysulfide and RE *** inclusions formed in the 112 ppm RE steel were harmful to the low temperature toughness,while few inclusions formed in the 47 ppm RE steel had almost no influence on the low temperature *** two RE additions had no effect on strength of the *** the finishing cooling temperature was increased and the cooling rate was decreased within a certain range,the volume fractions of polygonal ferrite and quasi-polygonal ferrite as well as the number density and size of martensite–austenite islands were *** such combined effect,the strength of the steels had almost no *** the finishing cooling temperature was increased from 481 to 584℃and the cooling rate was reduced from 20 to 13℃/s,for the steel with 112 ppm addition of RE,there was an obvious decrease in the low temperature *** reduced value(about 33 J)of the USE of steel consisted of two parts including the influence(about 18 J)of more inclusions formed due to 112 ppm addition of RE and the eff ect(about 15 J)of the lower high-angle grain boundaries.

关键词： Low temperature toughness Cooling process High-angle grain boundaries(HAGBs) Ductile–brittle transition temperature(DBTT) Rare earth Inclusions

Simultaneously Improving Mechanical Properties and Stress Corrosion Cracking Resistance of High-Strength Low-Alloy Steel via Finish Rolling within Non-recrystallization Temperature

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Acta metallurgica Sinica(English Letters) 2021年第4期34卷 565-578页

作者： Hongchi Ma Baijie Zhao Yi Fan Kui Xiao Jinbin Zhao Xuequn Cheng Xiaogang Li key laboratory for Corrosion and Protection(MOE) Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing100083China Jiangsu key laboratory for Premium Steel materials Nanjing Iron&Steel United Co.Ltd.Nanjing210035China state key laboratory of metal material for marine equipment and application AnsteelAnshan114021China

The effect of hot rolling process on microstructure evolution,mechanical properties and stress corrosion cracking(SCC)resistance of high-strength low-alloy(HSLA)steels was investigated by varying the finish rolling temperature(FRT)and total rolling *** results revealed granular bainite with large equiaxed grains was obtained by a total rolling reduction of60%with the FRT of 950℃(within recrystallization temperature T_(r)).The larger grain size and much less grain boundaries should account for the relatively lower strength and SCC resistance.A larger rolling reduction of 80% under the same FRT resulted in the formation of massive martensite-austenite(M/A)constituents and resultant low ductility and SCC *** contrast,a good combination of strength,ductility and SCC resistance was obtained via 80% rolling reduction with the FRT of 860℃(within non-recrystallization temperature T_(nr)),probably because of the fine grain size and M/A constituents,as well as a high density of grain boundary network.

关键词： High-strength low-alloy(HSLA)steel Finish rolling temperature Non-recrystallization temperature Stress corrosion cracking(SCC) Grain boundary character Martensite-austenite(m/a)constituents

Molecular Simulation of Chain Initiation Mechanism in Oxidation of Lubricant Base Stock

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China Petroleum Processing & Petrochemical Technology 2021年第4期23卷 105-112页

作者： Xia Lei Li Yan Zhang Hongmei Jiang Zhengyi Long Jun School of material and metallurgy University of Science and Technology LiaoningAnshan 114051 state key laboratory of metal material for marine equipment and application Anshan 114009 Iron&Steel Research Institutes of Ansteel Group Corporation Anshan 114009 SINOPEC Research Institute of Petroleum Processing Beijing 100083

Chain initiation reactions in the oxidation process of lubricant base stock molecules were studied by molecular *** ways to initiate lubricant oxidation were *** included the dissociation of chemical bonds in base stock molecules and the reaction between base stock molecules and oxygen(O_(2)),*** activation energy of above methods was *** results show that C‒C bonds are more likely to break than C‒H bonds to generate free radicals by the pyrolysis of chemical *** C‒C bonds with tertiary carbon atoms are preferential positions to ***,their bond dissociation energy is above 360 kJ/mol,which is difficult to occur under lubricant working *** chain initiation is more likely to occur by the way that O_(2) attacks the two atoms in C‒H bonds at the same time,and is then embedded into the C‒H bond to produce hydrocarbon *** then,the O‒O bond is cracked to form hydroxyl radicals and alkoxy *** C‒H bonds with tertiary carbon atoms are preferential reaction sites,the reaction activation energy of which is about 190.11 kJ/mol.

关键词： molecular simulation lubricant base stock oxidation chain initiation

Relationship between microstructure and corrosion behavior of high-grade pipeline steel in a low-temperature environment

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Journal of Iron and Steel Research(International) 2021年第8期28卷 1037-1046页

作者： Jia-qiang Jing Jie Guo Ba Li Shu-jun Jia Yi Ren School of Oil and Gas Engineering Southwest Petroleum UniversityChengdu 610500SichuanChina Department of Structural Steels Central Iron and Steel Research InstituteBeijing 100081China state key laboratory of metal material for marine equipment and application of Iron and Steel Research Institutes of Ansteel Group Corporation Anshan 114009LiaoningChina

The relationship between micro structure and corrosion behavior of high-grade pipeline steel under low-temperature conditions was comparatively investigated by the potentiodynamic polarization and electrochemical impedance spec-troscopy test combining with optical micrographs,scanning electron microscopy,transmission electron microscopy and electron back-scattered *** results showed that,compared with room and high temperature,low temperature could influence the corrosion behavior of high-grade pipeline steel,which means that the corrosion potential and current density decreased and the corrosion resistance increased ***,double layer structures of the interface became thicker and more *** low-temperature environment,acicular ferrite had the martensite/austenite constituents with less amount and smaller size,a higher density of low angle grain boundaries and smaller effective grain sizes compared with granular bainite,which demonstrated higher corrosion resistance.

关键词： Low temperature High-grade pipeline steel Corrosion behavior Resistance Acicular ferrite Granular bainite Martensite/austenite constituent

Electronic and topological properties of kagome lattice LaV3Si2

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钨科技(英文) 2023年第3期5卷 317-324页

作者： Xue-Jiao Chen Bing-Wen Zhang Dong Han Zhi-Cheng Zhong CAS key laboratory of Magnetic materials Devices and Zhejiang Province Key Laboratory of Magnetic Materials and Application TechnologyNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Fujian key laboratory of Functional marine Sensing materials Center for Advanced Marine Materials and Smart SensorsCollege of Material and Chemical EngineeringMinjiang UniversityFuzhou 350108China Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of SciencesChangchun 130033China China Center of materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Topological kagome lattice at the frontier of fundamental physics plays a key role in non-trivial topological quantum ***,we predict and investigate kagome lattice rare-earth vanadium-based quantum material LaV3Si2using density functional theory *** phonon spectrum and crystal transformation show stability of this material,which may be grown by experimental *** fermions,flat bands,and van Hove points as some basic features are presented in band structure and surface ***,symmetry-based compatibility relations support enforced semi-metal for occupied electron numbers with strong Berry *** results suggest that rare-earth vanadium-based RV3Si2can be treated as a new family kagome lattice.

关键词： Vanadium Kagome lattice Rare earth Electronic Dirac points

Nucleation Analysis of Variant Transformed from Austenite with Σ_(3) Boundary in High-Strength Low-Alloy Steel

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Acta metallurgica Sinica(English Letters) 2021年第4期34卷 523-533页

作者： Bin-Bin Wu Zhi-Quan Wang Cheng-Jia Shang Yi-Shuang Yu Devesh Misra Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing100083China state key laboratory of metal material for marine equipment and application Anshan114000China laboratory for Excellence in Advanced Steel Research Department of MetallurgicalMaterials and Biomedical EngineeringUniversity of Texas at El Paso500 WUniversity AvenueEl PasoTX79968USA

We elucidate here the effects of annealing twins on phase transformation products based on electron back-scatter diffraction analysis and corresponding microstructure visualization and quantification *** and bainite were obtained by rapid continuous cooling and isothermal processing at different temperatures,respectively,which were designed to study variants formed in austenite with Σ_(3) *** isothermal transformation near martensite start(M_(s))temperature was most conducive in obtaining the highest content of twin-related V_(1)/V_(2) variant *** on the classical nucleation theory of martensite and bainite,respectively,the role of austenite Σ_(3) boundary in martensite and bainite transformation is illustrated.

关键词： Steel AusteniteΣ_(3)boundary Variant Phase transformation Martensite Bainite

Plastic Deformation Mechanism of Dual-phase Steel at Different Strain Rates

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Journal of Wuhan University of Technology(materials Science) 2020年第6期35卷 1142-1148页

作者：庞启航 ZHAO Zhenduo 徐梅徐振 ZHAO Tan School of materials and metallurgy University of Science and Technology LiaoningAnshan 114051China state key laboratory of metal material for marine equipment and application Anshan Iron&Steel Group Co.Ltd.Anshan 114009China state key laboratory of Advanced Stainless Steel materials Taiyuan Iron&Steel Group Co.Ltd.Taiyuan 030003China

The mechanical properties of dual-phase steel (DP1000) over the strain rate range of 10^-3-10^3 s^-1 were studied using an electronic universal testing machine and a high-speed tensile testing *** plastic deformation mechanism was investigated from the perspectives of the strain rate sensitivity index,activation volume and dynamic *** results show that the tensile strength and yield strength of DP1000 increase as the strain rate *** elongation increases without any change after fracture,and then decreased rapidly when the strain rate reaches 103 s^-*** true strain curves of DP1000 show three stages:the point of instability decreases in the strain range of 10^-3-10^-1 s^-1;the instability point increases between 100-5×10^2 s^-1;above 5×10^2 s^-1,and the instability strain becomes smaller *** plastic deformation mechanism of the DP was determined by the competitive contributions of work hardening (strain hardening,strain rate hardening) and softening effects due to the adiabatic temperature rise.

关键词： dual-phase steel strain rate plastic deformation microstructure

Heterogeneous Microstructure-Induced Mechanical Responses in Various Sub-Zones of EH420 Shipbuilding Steel Welded Joint Under High Heat Input Electro-Gas Welding

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Acta metallurgica Sinica(English Letters) 2021年第10期34卷 1427-1433页

作者： Xu Xie Tan Zhao Heming Zhao Song Li Cong Wang School of metallurgy Northeastern UniversityShenyang 110819China state key laboratory of metal material for marine equipment and application Angang Steel Co.Ltd.Anshan 114021China Minmetals Yingkou Medium Plate Co. Ltd.Yingkou 115005China Nanjing Steel Co. Ltd.Nanjing 210035China state key laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China

Heterogeneous microstructure-induced mechanical responses in EH420 shipbuilding steel welded joint by electro-gas welding processed have been systematically studied by scanning electron microscopy,electron backscatter diffraction and mechanical *** with the coarse-grained heat-affected zone(CGHAZ),the weld metal presents higher toughness(129.3 J vs.37.3 J)as it contains a large number of acicular ferrites with high-angle grain boundaries(frequency 79.2%)and special grain boundary∑3(frequency 55.3%).Moreover,coarse austenite grains in CGHAZ and slender martensite–austenite constituents between bainite laths may likely facilitate crack *** ferrites and tempered pearlites formed at the junction of the fine-grained heat-affected zone and the intercritical heat-affected zone induced a softened zone with an average hardness of 185 HV0.5,which is the main reason for the occurrence of tensile fracture.

关键词： Heterogeneous microstructure Mechanical properties Electro-gas welding High heat input Shipbuilding steel