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Prediction of maximum carbon element content in continuous casting billets of 82B cord steel based on statistics of extreme values method

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Journal of Iron and Steel Research International 2020年第10期27卷 1163-1169页

作者： Dong-wei Guo Zi-bing Hou jiang-hai Cao Zhong-ao Guo Yi Chang Guang-hua Wen College of Materials Science and Engineering Chongqing UniversityChongqing 400044China

The research of carbon content along the casting direction of 82B cord steel billets is of great significance for improvingthe quality of cord products from subsequent ***,the traditional segregation and billets quality evaluationmethods have certain limitations,such as sampling length and analysis *** affect the accuracy of quality *** statistics of extreme values(SEV)was introduced to predict the maximum value of carbon element contentalong the casting direction,which can quantitatively characterize the segregation *** size of the selected billet is150 mm×150 mm,and the sampling location is the centerline of the *** experiment was conducted by consideringthe effect of cooling intensity and casting speed on the maximum value of carbon element ***,the calculationresults show that the SEN method can predict the maximum value of carbon element content along the casting directionof 82B cord steel,and the SEV method is proved to be effective by analyzing the carbon distribution and fluctuation in *** some extent,the SEV method can break the limitations of the sampling length and analysis area by predicting themaximum value of carbon element on a larger range of continuous casting billets with few *** the continuouscasting process the increase in cooling intensity makes the surface shrinking rate increase,which can slow down the flowof solute-enriched liquid to the center,and the center segregation can be *** the other hand,the function area ofthe final electromagnetic stirring can be expanded with the increase in the casting speed,which can reduce the concentration of carbon element in the center of the billets and reduce the maximum value of carbon element *** can providea new theoretical reference for the quantitative calculation of carbon content in continuous casting billets and the qualityevaluation of continuous casting billcts.

关键词： Cord steel Continuous casting Casting direction Segregation Statistics of extreme values

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In situ observations of austenite grain growth in Fe-C-Mn-Si super bainitic steel

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International Journal of Minerals,Metallurgy and Materials 2013年第11期20卷 1060-1066页

作者： Feng Liu Guang Xu Yu-long Zhang hai-jiang Hu Lin-xin Zhou Zheng-liang Xue The Key Laboratory of the Ministry of Education of China for Ferrous Metallurgy and Resources Utilization Wuhan University of Science and Technology State Key Laboratory of Development and Application Technology of Automotive Steels (Baosteel Group) Daye Special Steel Co. Ltd. Hubei Xinyegang Steel Co. Ltd.

In situ observations of austenite grain growth in Fe-C-Mn-Si super bainitic steel were conducted on a high-temperature laser scanning confocal microscope during continuous heating and subsequent isothermal holding at 850, 1000, and 1100℃ for 30 min. A grain growth model was proposed based on experimental results. It is indicated that the austenite grain size increases with austenitizing temperature and holding time. When the austenitizing temperature is above 1100℃, the austenite grains grow rapidly, and abnormal austenite grains occur. In addition, the effect of heating rate on austenite grain growth was investigated, and the relation between austenite grains and bainite morphology after bainitic transformations was also discussed.

关键词： bainitic steel austenite grain growth kinetics bainitic transformations

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Effects of strain states on stability of retained austenite in medium Mn steels

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Journal of Iron and Steel Research International 2017年第11期24卷 1125-1130页

作者： Mei Xu Yong-gang Yang Jia-yong Chen Di Tang hai-tao jiang Zhen-li Mi Institute of Engineering Technology University of Science and Technology BeijingBeijing 100083China BYD Auto Industry Company Limited Shenzhen 518116GuangdongChina Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China

Based on uniaxial tensile and plane strain deformation tests, the effects of strain states on the stability of RA （retained austenite） in medium Mn steels, which were subjected to IA （intercritical annealing） and Q＆P （quenching and partitioning） processing, were investigated. The volume fractions of RA before and after deformation were measured at different equivalent strains. The transformation behaviors of RA were also investigated. The stability of RA differed across two different transformation stages at the plane strain state： the stability was much lower in the first stage than in the second stage. For the uniaxial ten sion strain state, the stability of RA corresponded only to a single transformation stage. The main reason was that there were two types of transformations from RA in the medium Mn steel for the plane strain state. One type was that the martensite originated in the strain-induced stacking faults （SISF）. The other type was the strain-induced directly twin martensite at a certain equivalent strain. However, for the uniax- ial tension state, only the strain-induced twin martensite was observed. Dislocation lines and dislocation tangles were also observed in specimens deformed at different strain states. In addition, complex micro- structures of stacking faults and lath-like phases were observed within a grain at the plane strain state.

关键词： Medium Mn steel Strain state Retained austenite Stability Stacking fault Twin martensite

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Three-dimensional crustal velocity structure and activity characteristics of the Madoi Ms7.4 earthquake in 2021

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Applied Geophysics 2022年第4期19卷 590-602,605页

作者： Ma Yong Zhang hai-jiang Gao Lei and Chen Zhi-Gang Tianjin Earthquake Agency Tianjin 300201China School of Earth and Space Sciences University of Science and Technology of ChinaHefei 230026China Chinese Academy of Geological Sciences Beijing 100037China

In this paper,using natural earthquake P-wave arrival time data recorded by the seismic network in the surrounding area of Madoi,the three-dimensional fine P-wave crustal velocity structure at depths above 60 km in the epicenter of the Madoi Ms7.4 earthquake was inverted using the double-difference seismic tomography *** the basis of the relocation of the source of the aftershock sequence,we summarized the strip-shaped distribution characteristics along the strike of the jiangcuo fault,revealing the significant heterogeneity of the crustal velocity structure in the source *** has found that most of the Madoi Ms7.4 aftershocks were located in the weak area of the high-speed anomaly in the upper *** focal depth changed with the velocity structure,showing obvious fluctuation and segmentation *** was a good correspondence between the spatial distribution and the velocity *** high-velocity bodies of the upper crust in the hypocenter area provided a medium environment for earthquake rupture,the low-velocity bodies of the middle crust formed the deep material,and the migration channel and the undulating shape of the high-speed body in the lower crust corroborated the strong pushing action in the *** results confirmed that under the continuous promotion of tectonic stress in the Madoi area,the high-speed body of the jiangcuo fault blocked the migration of weak materials in the middle *** the stress accumulation exceeded the limit,the Madoi Ms7.4 earthquake ***,the nonuniform velocity structure near the fault plane determined the location of the main shock and the spatiotemporal distribution of the aftershock sequence.

关键词： Madoi Ms7.4 earthquake double-difference tomography 3D velocity structure seismic activity characteristics

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Multi-parameter identification of gratings measurement by Experimental Ray Tracing

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Research in Astronomy and Astrophysics 2021年第11期21卷 119-126页

作者： Li-Si Chen Zhong-Wen Hu hai-Jiao jiang Hui-Min Kang Chen-Zhong Wang National Astronomical Observatories/Nanjing Institute of Astronomical Optics&Technology Chinese Academy of SciencesNanjing 210042China CAS Key Laboratory of Astronomical Optics&Technology Nanjing Institute of Astronomical Optics&TechnologyNanjing 210042China University of Chinese Academy of Sciences Beijing 100049China

A simple method for measuring grating groove density as well as its position and orientation is proposed based on the idea of ERT(Experimental Ray Tracing).Conventional methods only measure grating groove density with accuracy limited by its rotary stage and *** method proposed in the paper utilizes linear guides which could be calibrated to much higher *** is applicable to gratings of arbitrary surface profile or mosaic of a group of various *** measurement error sources are simulated by the Monte Carlo method and the results show high accuracy capability of grating parameters identification.A verification testing is *** accuracy dependency on main configuration parameters is evaluated.A method to expand measurement range by double wavelength is also discussed.

关键词： grating groove density position orientation measurement range

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An Adversarial Smart Contract Honeypot in Ethereum

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Computer Modeling in Engineering & Sciences 2021年第7期128卷 247-267页

作者： Yu Han Tiantian Ji Zhongru Wang Hao Liu hai jiang Wendi Wang Xiang Cui Key Laboratory of Trustworthy Distributed Computing and Service(BUPT) Ministry of EducationBeijing University of Posts and TelecommunicationsBeijing100876China Chinese Academy of Cyberspace Studies Beijing100010China Qianxin Technology Group Co. Ltd.Beijing100088China Beijing DigApis Technology Co. Ltd.Beijing100081China Cyberspace Institute of Advanced Technology Guangzhou UniversityGuangzhou510006China

A smart contract honeypot is a special type of smart *** type of contract seems to have obvious vulnerabilities in contract *** a user transfers a certain amount of funds to the contract,then the user can withdraw the funds in the ***,once users try to take advantage of this seemingly obvious vulnerability,they will fall into a real ***,the user’s investment in the contract cannot be *** honeypot induces other accounts to launch funds,which seriously threatens the security of property on the *** methods for honeypots are ***,studying the manner by which to defend existing honeypots is insufficient to fight against *** new honeypots that may appear in the future from the perspective of an attacker must also be ***,we propose a type of adversarial *** code and behavioral features of honeypots are obtained through a comparative analysis of the 158,568 nonhoneypots and 352 *** build an adversarial honeypot,we try to separately hide these features and make the honeypot bypass the existing detection *** construct 18 instances on the basis of the proposed adversarial honeypot and use an open-source honeypot detection tool to detect these *** experimental result shows that the proposed honeypot can bypass the detection tool with a 100%***,this type of honeypot should be given attention,and defensive measures should be proposed as soon as possible.

关键词： Honeypot smart contract adversarial bypass detection

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Effects of Solution Treatment on the Microstructure,Tensile Properties,and Impact Toughness of an Al–5.0Mg–3.0Zn–1.0Cu Cast Alloy

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Acta Metallurgica Sinica(English Letters) 2021年第1期34卷 98-110页

作者： Hua-Ping Tang Qu-Dong Wang Colin Luo Chuan Lei Tian-Wen Liu Zhong-Yang Li Kui Wang hai-Yan jiang Wen-jiang Ding National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong UniversityShanghai 200240China Schulich School of Engineering University of CalgaryCalgaryABCanada

This study investigates the eff ect of solution treatment(at 470°C for 0–48 h)on the microstructural evolution,tensile properties,and impact properties of an Al–5.0Mg–3.0Zn–1.0Cu(wt%)alloy prepared by permanent gravity *** results show that the as-cast microstructure consists ofα-Al dendrites and a network-like pattern of T-Mg32(AlZnCu)49 *** of the T-phases were dissolved within 24 h at 470℃;and a further prolonging of solution time resulted in a rapid growth ofα-Al *** transformation from the T-phase to the S-Al2CuMg phase was discovered in this *** the tensile properties and impact toughness increased quickly,reached a maximum peak value,and decreased gradually as the solution treatment *** impact toughness is more closely related to the elongation,and the relationship between impact toughness and elongation appears to obey an equation:IT=8.43 *** optimal solution treatment at 470℃for 24 h,this alloy exhibits excellent mechanical properties with the ultimate tensile strength,yield strength,elongation and impact toughness being 431.6 MPa,270.1 MPa,19.4%and 154.7 kJ/m^(2),which are comparable to that of a wrought Al–6.0 Mg–0.7 Mn alloy(5E06,a 5 xxx aluminum alloy).Due to its excellent comprehensive combination of mechanical properties,this cast alloy has high potential for use in components which require medium strength,high ductility and high toughness.

关键词： Al–Mg–Zn–Cu cast alloys T-Mg32(AlZn)49 phase S-Al2CuMg phase Impact toughness Mechanical properties

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Machine learning based techno-economic process optimisation for CO_(2) capture via enhanced weathering

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Energy and AI 2023年第2期12卷 163-177页

作者： hai jiang Shuo Wang Lei Xing Valerie J.Pinfield Jin Xuan School of Chemistry and Chemical Engineering Jiangsu UniversityZhenjiang 212013China School of Mechanical Engineering Dalian University of TechnologyDalian 116024China Department of Chemical and Process Engineering University of SurreyGuildford GU27XHUK Department of Chemical Engineering Loughborough UniversityLoughborough LE113TUUK

This work evaluated the practicability and economy of the enhanced weathering(EW)-based CO_(2) capture in series packed bubble column(S-PBC)contactors operated with different process configurations and *** S-PBC contactors are designed to fully use the advantages of abundant seawater and highly efficient freshwater through a holistic M4 model,including multi-physics,machine learning,multi-variable and multiobjective *** economic analysis is then performed to investigate the cost of different S-PBC configurations.A data-driven surrogate model based on a novel machine learning algorithm,extended adaptive hybrid functions(E-AHF),is implemented and trained by the data generated by the physics-based *** and NSGA-II are applied to perform single-and multi-objective optimisation to achieve maximum CO_(2) capture rate(CR)and minimum energy consumption(EC)with the optimal values of eight design *** R2 for the prediction of CR and EC is higher than 0.96 and the relative errors are lower than 5%.The M4 model has proven to be an efficient way to perform multi-variable and multi-objective optimisation,that significantly reduces computational time and resources while maintaining high prediction *** trade-off of the maximum CR and minimum EC is presented by the Pareto front,with the optimal values of 0.1014 kg h−1 for CR and 6.1855 MJ kg−1 CO_(2) for *** calculated net cost of the most promising S-PBC configuration is around 400$t−1 CO_(2),which is about 100$t−1 CO_(2) lower than the net cost of current direct air capture(DAC),but compromised by slower CO_(2) capture rate.

关键词： Enhanced weathering Series packed bubble column Data-driven model Multi-variable and multi-objective optimisation CO_(2)capture

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Microstructure and Mechanical Properties of TRIP Steel with Annealed Martensite

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Journal of Iron and Steel Research International 2014年第5期21卷 527-531页

作者： Wei DING Zhi-hua GONG Bao-feng WANG Di TANG hai-tao jiang School of Material and Metallurgy Inner Mongolia University of Science and Technology National Engineering Research Center for Advanced Rolling Technology University of Science and Technology Beijing

The microstructure and mechanical properties of cold rolled TRIP steel containing C 0.2, Si 0.5, Mn 1.5, A1 1.3, and Nb-kV 0.13 （mass%） with annealed martensite （TAM steel） were investigated using optical microscopy, field emission gun scanning electronic microscope （FEG SEM）, transmission electron microscopy （TEM）, X-ray diffraction （XRD）, and mechanical testing. The mierostructure of the TAM steel mainly consisted of polygonal ferrite, bainite, annealed martensite and retained austenite. The martensite after annealing did not spheroidize, which consisted of annealed lath martensite structure and interlath second phase. Compared with the traditional TRIP steel with polygonal ferrite matrix （TPF steel）, the TAM steel has more excellent elongation rate over 32%. The TAM steel also has better strain hardening behavior than the TPF steel. The excellent elongation and strain harden- ing behavior of TAM steel result from high retained austenite stability of the TAM steel, which is attributed to its fine distribution and medium strength ratio of second phase to matrix.

关键词： TRIP steel retained austenite annealed martensite mechanical property

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Chemical Research in Chinese Universities 2013年第6期29卷 1055-1058页

作者： KONG Da-liang WEI Bo ZHOU Sheng-yan YANG hai-shan jiang Yang China-Japan Union Hospital of Jilin University Changchun 130033 P.R.China

Two gadolinium polyoxometalates, KCs4[Gd（a-SiW11O39）].25HzO（POM-1） and K13[Gd（f12-SiWllO39）a]·27H2O（POM-2）, have been evaluated as the candidates of potential magnetic resonance imaging Tl（longitudinal relaxation） contrast agents. Longitudinal relaxivities of POM-2 are much higher than those of POM-1 in pure water and protein solution, respectively. However, compared with POM-1, POM-2 interacts with protein more strongly through electrostatic interaction, which is comfirmed by the fluoresence quenching of human serum albumin（HSA） in solu- tions with different polyoxometalate concentrations. Meanwhile, POM-1 presentes much lower cytotoxicity in the cell viability tests.

关键词： Magnetic resonance imaging(MRI) Contrast agent Polyoxometalate

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