检索结果-南通市图书馆

Tailoring grain growth and solid solution strengthening of single-phase CrCoNi medium-entropy alloys by solute selection

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2020年第19期54卷 196-205页

作者： G.W.hu L.C.Zeng H.Du X.W.Liu Y.Wu P.Gong Z.T.Fan q.hu E.P.George Key Laboratory of Metallurgical Equipment and Control Technology Ministry of EducationWuhan University of Science and TechnologyWuhan 430081China hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering Wuhan University of Science and TechnologyWuhan 430081China State Key Laboratory of Materials Processing and Die&Mould Technology Huazhong University of Science and TechnologyWuhan 430074China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China Institute of Applied Physics Jiangxi Academy of SciencesNanchang 330029China Oak Ridge National Laboratory Materials Science and Technology DivisionOak RidgeTN37831USA Department of Materials Science and Engineering University of TennesseeKnoxvilleTN37996USA

In the present study,we selected solutes to be added to the Cr Co Ni medium-entropy alloy(MEA)based on the mismatch of self-diffusion activation energy(SDq)between the alloying elements and constituent elements of the matrix,and then investigated their grain growth behavior and mechanical *** and Al were selected as the solutes for investigation primarily because they have higher and lower SDq,respectively,than those of the matrix elements;a secondary factor was their higher and lower shear *** concentrations were fixed at 3 at.%each because previous work had shown these compositions to be single-phase solid solutions with the face-centered cubic *** alloys were produced by arc melting,casting,homogenizing,cold rolling and annealing at various temperatures and times to produce samples with different grain *** were(a)the base alloy Cr Co Ni,(b)the base alloy plus 3 at.%Mo,and(c)the base alloy plus 3 at.%*** activation energies for grain growth of the Cr Co Ni,Cr Co Ni-3Mo and CrCo Ni-3Al MEAs were found to be^251,~368 and^219 k J/mol,respectively,consistent with the notion that elements with higher SDq(in this study Mo)retard grain growth(likely by a solute-drag effect),whereas those with lower values(Al)accelerate grain *** roomtemperature tensile properties show that Mo increases the yield strength by^40%but Al addition has a smaller strengthening effect consistent with their relative shear *** yield strength as a function of grain size for the three single-phase MEAs follows the classical Hall-Petch relationship with much higher slopes(>600 MPaμm-0.5)than traditional solid *** work shows that the grain growth kinetics and solid solution strengthening of the Cr Co Ni MEA can be tuned by selecting solute elements that have appropriate diffusion and physical properties.

关键词： Medium and high entropy alloys Solute-drag effect Microstructure Grain growth kinetics Solid solution strengthening

MODELING OF AUSTENITE GRAIN SIZE IN LOW-ALLOY STEEL WELD METAL

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2004年第2期17卷 147-154页

作者： A.G.huang Y.S.Wang Z.Y.Li J.G.Xiong q.hu School of Materials Science & Engineering,huazhong University of Science and Technology,Wuhan 430074,China Sch. of Mat. Sci. and Eng. Huazhong Univ. of Sci. and Technol. Wuhan 430074 China

The size of austenite grain has significant effects on components and proportions ofvarious ferrites in low-alloy steel weld metal. Therefore, it is important to determinethe size of austenite grain in the weld metal. In this paper, a model based upon thecarbon diffusion rate is developed for computing austenite grain size in low-alloy steelweld metal during continuous cooling. The model takes into account the effects of theweld thermal cycles, inclusion particles and various alloy elements on the austenitegrain growth. The calculating results agree reasonably with those reported experimentalobservations. The model demonstrates a significant promise to understand the weldmicrostructure and properties based on the welding science.

关键词： low-alloy steel anstenite mathematical model diffusion

Detection of Railway Ballast Damage by Vibration Measurement

在线全文

学校读者我要写书评

暂无评论

Detection of Railway Ballast Damage by Vibration Measurement

The 16th Annual Conference of Hong Kong Society of Theoretical and Applied Mechanics 2012、The 1st Mainland-Hong Kong Youth Forum on Mechanics 2012、The 8th Shanghai-Hong Kong Forum on Mechanics and Its Application 2012

作者： q.hu H.F.Lam J.H.Yang H.Y.Peng Department of Civil and Architectural Engineering City University of Hong Kong

With the advent of high speed and high capacity railway systems,damage of the railway ballast(i.e.,the crash of ballast into smaller sizes) has become more and more *** main function of ballast is to hold the sleepers and rails in *** ballast damage will lead to rail buckling and so as to increase the chance of ***,the damage detection of the railway ballast plays an important role in railway *** railway companies mainly rely on visual inspection and destructive core test for ballast damage ***,visual inspection is only effective to detect ballast damage on the surface,the ballast damage under sleepers is impossible to be detected in this way,thus a practical railway ballast damage detection method is in *** the ballast under the sleeper is damaged,the stiffness of the ballast in supporting the sleeper will be *** change in stiffness will alter the vibration characteristics of the concrete *** the literature,some researchers propose to use in-situ vibration measurement(Lam et al.2010;Lam and Wong 2011) to estimate the change in ballast stiffness by following a model-based *** paper reports the results of the numerical and experimental case studies of the research work in Lam and Wong(2011).In the proposed method,the rail-sleeper-ballast system is modeled as a Timoshenko beam on elastic *** ballast stiffness is represented by the stiffness of the elastic *** reduction in ballast stiffness can then be estimated by model updating of the rail-sleeper -ballast system using the measured vibration data of the in-situ sleeper. To test the proposed method,a full-scale ballasted track was built in an indoor test panel.A series of well-designed impact hammer tests was carried out on the intact in-situ *** updating of the undamaged rail-sleeper-ballast system was employed to identify a representative model to represent the real *** this comput

关键词： Detection of Railway Ballast Damage by Vibration Measurement

Structural Health Monitoring of Short- and Medium- Span Reinforced Concrete Bridges

在线全文

cnki会议

学校读者我要写书评

暂无评论

Structural Health Monitoring of Short- and Medium- Span Rein...

作者： H.F.Lam J.H.Yang q.hu H.Y.Peng Department of Civil and Architectural Engineering City University of Hong Kong

With the advances in sensor and data acquisition technologies,it is now possible to obtain a set of reliable dynamic ***,the extraction of useful information from this set of measurements for structural model updating and damage detection remains a challenging area of research.A key difficulty is the selection of a "suitable" class of *** is well known that the model parameter identification process is uncertain in nature due to the problems of modeling error, measurement noise,and "incomplete" *** the model class selected is too complicated (i.e.,has too many model parameters,see Fig.1 as an example),then the results of model identification with a given set of measurement will become very uncertain and even become *** is because the information that can be extracted from the set of measured data is not enough to solve all the uncertain parameters(i.e.,the unknowns in the problem).However,if the model class adopted is too simple(see Fig.2),then the prediction error will be very large,thus resulting in unreliable identification *** is because the class of models is too simple for representing the real *** this paper,rather than assume a single model class in the identification process,a multiple model-class approach that considers all "plausible" model classes in this process and weighs their relative importance through the Bayesian probabilistic approach will be *** concept of multiple model-classes is relatively new to *** is the main objective of this paper to illustrate this approach through simple examples and show its importance in structural model updating and structural health monitoring of reinforced concrete bridges.

关键词： Span Reinforced Concrete Bridges and Medium Structural Health Monitoring of Short

Brace Damage Detection of a Transmission Tower Utilizing Vibration Data

在线全文

cnki会议

学校读者我要写书评

暂无评论

Brace Damage Detection of a Transmission Tower Utilizing Vib...

作者： H.F.Lam J.H.Yang q.hu H.Y.Peng Department of Civil and Architectural Engineering City University of Hong Kong

Transmission towers play a very significant role in the distribution of electrical *** structural health monitoring of transmission towers is an important research *** is impractical and impossible to develop a general method that can detect all kinds of damage for all types of structures. For transmission towers,brace buckling due to strong wind load during typhoon is not uncommon (Yin et al.2009;Lam and Yin 2011).To address this problem,this paper reports a feasibility study on the use of vibration data of transmission tower in the detection of damaged braces by following a model-based *** of the important contributions of this paper is the vibration test of a scaled transmission tower(see Figure 1) under laboratory conditions. Modal identification was carried out by MODE-ID(Beck 1979) and the natural frequencies and mode shapes of the transmission tower were obtained from impact hammer tests.A self-developed MATLAB program is then employed to establish the model-predicted modal parameters of the *** updating was conducted by minimizing the discrepancy between model-predicted and measured modal parameters to identify an "optimal" model to represent the "healthy" transmission *** the experimental verification,different damage patterns were considered by removing different brace *** each damage pattern,the modal parameters of the "damaged" tower were measured by impact hammer *** the model updating of the "damaged" structure,a dimensionless scaling factor is applied on the Young's modulus of each possibly damaged brace *** scaling factor takes a value of 1 to 0.A value of 1 means undamaged and the stiffness of the brace is 100%retrained;A value of 0 means completely damage and 100%loss of stiffness. Those factors will be included in the model updating of the "damaged" *** other words,the updated scaling factors can tell the locations and extents of damage.

关键词： Brace Damage Detection of a Transmission Tower Utilizing Vibration Data

Finite Element Model Updating of Coupled Slab System Based on Full-scale Dynamic Test

在线全文

cnki会议

学校读者我要写书评

暂无评论

Finite Element Model Updating of Coupled Slab System Based o...

作者： H.F.Lam H.Y.Peng J.H.Yang q.hu Department of Civil and Architectural Engineering City University of Hong Kong

This paper exhibits a model updating of a coupled-slab system(at the second and third floors) of the Tin Shui Wai Indoor Recreation Center in Hong Kong(see Fig.1).Based on the structural drawings,a finite element(FE) model of the coupled-slab system was created in ANSYS (see Fig.2).The model-predicted modal parameters of the first three modes are summarized in Table *** that Rayleigh damping is *** results from computer simulation will not be "exact" owing to the error in the model class and the values assigned to the model *** quantify the accuracy of the FE model results,a series of field tests were carried out to measure the modal parameters of the *** measured modal parameters are summarized in Table *** must be pointed out that the measured and computer simulated modes are paired by using Modal Assurance Criteria(MAC).There is no surprise that the percentage errors between the measured and model-predicted modal parameters are large.

关键词： Model Finite Element Model Updating of Coupled Slab System Based on Full-scale Dynamic Test

Investigation of negative-parity states in ^(16)C via deuteron inelastic scattering

在线全文

cnki会议

学校读者我要写书评

暂无评论

Chinese Physics C 2022年第5期46卷 70-76页

作者： Z.W.Tan J.L.Lou Y.L.Ye Y.Liu D.Y.Pang C.X.Yuan J.G.Li W.Liu Y.Jiang B.Yang L.C.Tao K.Ma Z.H.Li q.T.Li X.F.Yang J.Y.Xu H.Z.Yu J.X.Han S.W.Bai S.W.huang G.Li H.Y.Wu H.L.Zang J.Feng J.S.Wang Y.Y.Yang P.Ma q.hu Z.Bai Z.H.Gao F.F.Duan L.Y.hu J.H.Tan S.q.Sun Y.S.Song H.J.Ong D.T.Tran H.Y.Zhu B.L.Xia School of Physics and State Key Laboratory of Nuclear Physics and Technology Peking UniversityBeijing 100871China School of Physics Beijing Key Laboratory of Advanced Nuclear Materials and PhysicsBeihang UniversityBeijing 100191China Sino-French Institute of Nuclear Engineering and Technology Sun Yat-Sen UniversityZhuhai 519082China Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China Fundamental Science on Nuclear Safety and Simulation Technology Laboratory Harbin Engineering UniversityHarbin 150001China Research Center for Nuclear Physics Osaka universityOsaka 567-0047Japan Institute of Physics Vietnam Academy of Science and TechnologyHanoi 10000Vietnam Institute of Materials China Academy of Engineering PhysicsMianyang 621907China

Two low-lying unbound states in ^(16)C are investigated by deuteron inelastic scattering in inverse *** the 2^(-) state at 5.45 MeV previously measured in a 1n knockout reaction,a new resonant state at 6.89 MeV is observed for the first *** inelastic scattering angular distributions of these two states are well reproduced by the distorted-wave Born approximation(DWBA)calculation with an l=1 *** addition,the spinparities of the unbound states are discussed and tentatively assigned based on shell model calculations using the modified YSOX interaction.

关键词： negative-parity states inelastic scattering ^(16)C

Effect of Nb-V microalloying on the hot deformation behavior of medium Mn steels

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 360-368页

作者： Yumeng Wang qinyi Guo Bin hu Haiwen Luo School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China

The influence of Nb-V microalloying on the hot deformation behavior and microstructures of medium Mn steel(MMS)was investigated by uniaxial hot compression *** establishing the constitutive equations for simulating the measured flow curves,we successfully constructed deformation activation energy(q)maps and processing maps for identifying the region of flow *** concluded the following consequences of Nb-V alloying for MMS.(i)The critical strain increases and the increment diminishes with the increasing deformation temperature,suggesting that NbC precipitates more efficiently retard dynamic recrystallization(DRX)in MMS compared with solute Nb.(ii)The deformation activation energy of MMS is significantly increased and even higher than that of some reported high Mn steels,suggesting that its ability to retard DRX is greater than that of the high Mn content.(iii)The hot workability of MMS is improved by narrowing the hot processing window for the unstable flow stress,in which fine recrystallized and coarse unrecrystallized grains are present.

关键词： medium manganese steel niobium-vanadium microalloying flow behavior dynamic recrystallization hot workability

Reconstruction of Cherenkov image bymultiple telescopes of LHAASO-WFCTA

在线全文

学校读者我要写书评

暂无评论

Radiation Detection Technology and Methods 2022年第4期6卷 544-557页

作者： F.Aharonian q.An Axikegu L.X.Bai Y.X.Bai Y.W.Bao D.Bastieri X.J.Bi Y.J.Bi J.T.Cai Zhe Cao Zhen Cao J.Chang J.F.Chang E.S.Chen Liang Chen Liang Chen Long Chen M.J.Chen M.L.Chen q.H.Chen S.H.Chen S.Z.Chen T.L.Chen Y.Chen H.L.Cheng N.Cheng Y.D.Cheng S.W.Cui X.H.Cui Y.D.Cui B.D’Ettorre Piazzoli B.Z.Dai H.L.Dai Z.G.Dai Danzengluobu Ddella Volpe K.K.Duan J.H.Fan Y.Z.Fan Z.X.Fan J.Fang K.Fang C.F.Feng L.Feng S.H.Feng X.T.Feng Y.L.Feng B.Gao C.D.Gao L.q.Gao q.Gao W.Gao W.K.Gao M.M.Ge L.S.Geng G.H.Gong q.B.Gou M.H.Gu F.L.Guo J.G.Guo X.L.Guo Y.q.Guo Y.Y.Guo Y.A.Han H.H.He H.N.He S.L.He X.B.He Y.He M.Heller Y.K.Hor C.Hou X.Hou H.B.hu q.hu S.hu S.C.hu X.J.hu D.H.huang W.H.huang X.T.huang X.Y.huang Y.huang Z.C.huang X.L.Ji H.Y.Jia K.Jia K.Jiang Z.J.Jiang M.Jin M.M.Kang T.Ke D.Kuleshov K.Levochkin B.B.Li Cheng Li Cong Li F.Li H.B.Li H.C.Li H.Y.Li J.Li Jian Li Jie Li K.Li WLLi XRLi Xin Li Xin Li YZLi Zhe Li Zhuo Li E.W.Liang Y.F.Liang S.J.Lin B.Liu C.Liu D.Liu H.Liu H.D.Liu J.Liu J.L.Liu J.S.Liu J.Y.Liu M.Y.Liu R.Y.Liu S.M.Liu W.Liu Y.Liu Y.N.Liu W.J.Long R.Lu q.Luo H.K.Lv B.q.Ma L.L.Ma X.H.Ma J.R.Mao A.Masood Z.Min W.Mitthumsiri Y.C.Nan Z.W.Ou B.Y.Pang P.Pattarakijwanich Z.Y.Pei M.Y.qi Y.q.qi B.q.qiao J.J.qin D.Ruffolo A.Sáiz C.Y.Shao L.Shao O.Shchegolev X.D.Sheng J.Y.Shi H.C.Song Yu.V.Stenkin V.Stepanov Y.Su q.N.Sun X.N.Sun Z.B.Sun P.H.T.Tam Z.B.Tang W.W.Tian B.D.Wang C.Wang H.Wang H.G.Wang J.C.Wang J.S.Wang L.P.Wang L.Y.Wang R.Wang R.N.Wang W.Wang X.G.Wang X.Y.Wang Y.Wang Y.D.Wang Y.J.Wang Y.P.Wang Z.H.Wang Z.X.Wang Zhen Wang Zheng Wang D.M.Wei J.J.Wei Y.J.Wei T.Wen C.Y.Wu H.R.Wu S.Wu X.F.Wu Y.S.Wu S.q.Xi J.Xia J.J.Xia G.M.Xiang D.X.Xiao G.Xiao G.G.Xin Y.L.Xin Y.Xing Z.Xiong D.L.Xu R.X.Xu L.Xue D.H.Yan J.Z.Yan C.W.Yang F.F.Yang H.W.Yang J.Y.Yang L.L.Yang M.J.Yang R.Z.Yang S.B.Yang Y.H.Yao Z.G.Yao Y.M.Ye L.q.Yin N.Yin X.H.You Z.Y.You Y.H.Yu q.Yuan H.Yue H.D.Zeng T.X.Zeng W.Zeng Z.K.Zeng M.Zha X.X.Zhai B.B.Zhang F.Zhang H.M.Zhang H.Y.Zhang J.L.Zhang L.X.Zhang Li Zhang Lu Zhang P.F.Zhang P.P.Zhang R.Zhang S.B.Zhang S.R.Zhang S. Key Laboratory of Particle Astrophyics&Experimental Physics Division&Computing Center Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China TIANFU Cosmic Ray Research Center ChengduSichuanChina Dublin Institute for Advanced Studies 31 Fitzwilliam Place2DublinIreland Max-Planck-Institut for Nuclear Physics P.O.Box 10398069029 HeidelbergGermany State Key Laboratory of Particle Detection and Electronics BeijingChina University of Science and Technology of China Hefei 230026AnhuiChina School of Physical Science and Technology&School of Information Science and Technology Southwest Jiaotong UniversityChengdu 610031SichuanChina College of Physics Sichuan UniversityChengdu 610065SichuanChina School of Astronomy and Space Science Nanjing UniversityNanjing 210023JiangsuChina Center for Astrophysics Guangzhou UniversityGuangzhou 510006GuangdongChina Key Laboratory of Dark Matter and Space Astronomy&Key Laboratory of Radio Astronomy Purple Mountain ObservatoryChinese Academy of SciencesNanjing 210023JiangsuChina Key Laboratory for Research in Galaxies and Cosmology Shanghai Astronomical ObservatoryChinese Academy of SciencesShanghai 200030China Key Laboratory of Cosmic Rays(Tibet University) Ministry of EducationLhasa 850000TibetChina National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China Hebei Normal University Shijiazhuang 050024HebeiChina School of Physics and Astronomy(Zhuhai)&Sino-French Institute of Nuclear Engineering and Technology(Zhuhai) Sun Yat-sen UniversityZhuhai 519000China School of Physics(Guangzhou) Sun Yat-sen UniversityGuangzhou 510275GuangdongChina Dipartimento di Fisica dell’Universitàdi Napoli“Federico II” Complesso Universitario di Monte Sant’Angelovia Cinthia80126 NapoliItaly School of Physics and Astronomy Yunnan UniversityKunming 650091YunnanChina Département de Physique Nucléaire et Corpusculaire Facultéde SciencesUniversitéde Genève

Introduction One of main scientiﬁc goals of the Large High Altitude Air Shower Observatory(LHAASO)is to accurately measure the energy spectra of different cosmic ray compositions around the‘knee’*** Wide Field-of-View(FoV)Cherenkov Telescope Array(WFCTA),which is one of the main detectors of LHAASO and has 18 telescopes,is built to achieve this *** telescopes are put together and point to connected directions for a larger *** Telescopes are deployed spatially as close as possible,but due to their own size,the distance between two adjacent telescopes is about 10 ***,the Cherenkov lateral distribution and the parallax between the two telescopes should be considered in the event building process for images crossing over the boundaries of FoVs of the *** event building method for Cherenkov images measured by multiple telescopes of WFCTA is *** performance of the shower measurements using the combined images is evaluated by comparing with showers that are fully contained by a virtual telescope in *** and conclusion It is proved that the developed event building process can help to increase the FoV of WFCTA by 30%while maintaining the same reconstruction quality,compared to the separate telescope reconstruction method.

关键词： method directions conclusion