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Acta Metallurgica Sinica(English Letters) 2008年第6期21卷 391-398页

作者： S.J. Yao L.x. Du x.h. liu G.D. Wang State Key Laboratory ofRolling and Automation Northeastern University Shenyang 110004 China

Three warm-rolled ferrite/pearlite microstructures were prepared by rolling at 500℃, and the austenitizing characteristics were discussed in conjunction with deformation during the heating stage. The results indicated that the final austenite grain size was sensitive to the deformation direction of the initial warm-rolled microstructure. The transient microstructure at a given temperature was the most important influencing factor on the austenitizing characteristic combined with deformation. Moreover, the hot-rolled mierostructure also had to be prepared in an optimal state because of its direct effect on the warm-rolled microstructure.

关键词： Warm-rolled ferrite/pearlite Austenite Deformation Recrystallization

INFLUENCES OF EDGING ROLL ShAPE ON ThE PLASTIC STRAIN DISTRIBUTION OF SLAB DURING MULTI-PASS V-h ROLLING PROCESS

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Acta Metallurgica Sinica(English Letters) 2006年第1期19卷 51-56页

作者： h.L. Yu x.h. liu C.S. Li x.M. Zhao Y. Kusaba The State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110004 China Sumitomo Metal Induswies Ltd. Japan 6000891 Amagaski 660 JapanManuscript received 7 April 2005 in revised form 8 August 2005

Multi-pass slab vertical-horizontal （V-h） rolling process with variable edging roll shape have been simulated with explicit dynamic finite element method and updating geometric method. The distributions of plastic strain contour in slab daring rolling process with different edging roll and under different rolling stage have been obtained. The results show that there exist two thin strain assembling zones in slab when the flat edging roll is used, and there just exist one strain assembling zone in slab when the edging roll with groove is used. And compared the deformation equality between flat edging roll and edging roll with groove, the lateris better than the former, which supplies the theory prove to the slab deformation distribution during V-h rolling process and is helpful for predicting the slab texture.

关键词： strain V-h rolling multi-pass finite element method (FEM),updating geometric method

NUMERICAL SIMULATION OF MOLTEN POOL AND CONTROL STRATEGY OF KISS POINT IN A TWIN-ROLL STRIP CASTING PROCESS

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Acta Metallurgica Sinica(English Letters) 2008年第6期21卷 459-468页

作者： G.M. Cao C.G. Li Z. Y. liu D. Wu G.D. Wang x.h. liu State Key Laboratory of Rolling ＆ Automation Northeastern University Shenyang 110004 China

Coupled turbulent flow, temperature fields of the twin-roll casting strip process were simulated by three-dimensional finite element method. Based on the heat balance calculation and using inverse methods between the simulations and real experiments, the relational models among casting speed, location, and coefficient of heat transfer between molten metal and rolls in different regions are given. In the simulation, the calculated surface temperatures are in good agreement with the measured values. An on-line model of kiss point is derived by simulations and the geometry of molten pool, corresponding control strategy is also proposed.

关键词： Twin-roll strip casting Coupled temperature and flow field Numerical simulation Kiss point Control strategy

SIMULATION OF ThE TWIN ROLL STAINLESS STRIP CASTING PROCESS

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Acta Metallurgica Sinica(English Letters) 2001年第3期14卷 199-204页

作者： Y.C. Miao, x.M. Zhang, G.D. Wang, h.S. Di and x.h. liu (State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110004, China) State Key Laboratory of Rolling and Automation Northeastern University

The position of the solidification completed temperature of twin roll stainless strip casting process is very important to the quality of the casting strip. In order to control this position, the solidification completed temperature should be known at first. The present paper first simulated dendritic microsegregation under conditions of twin roll stainless strip casting, and got the relationship between the temperature and the solid fraction of the mush zone. The temperatures such as ZDT (equal to the solidification completed temperature) and LIT (liquid impenetrable temperature), et al., also can be found from this relationship. Then by using the turbulent model, the flow and thermal fields of the pool of the twin roll stainless strip casting and the speed and temperature fields of different casting speeds were given and also explained. The simulation results are coincident with the experimental results. Combined with the results of these simulations, the appropriated casting speed was found.

关键词： Computer simulation Continuous casting Segregation (metallography) Stainless steel Turbulence

INFLUENCE OF COLD ROLLING TEChNOLOGY ON TExTURE EVOLUTION OF IF STEEL

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Acta Metallurgica Sinica(English Letters) 2002年第3期15卷 312-316页

作者： J.x. Li, x.h. liu and G.D. WangState Key Laboratory of Rolling & Automation, Northeastern University, Shenyang 110006, China Manuscript received 16 July 2001 in revised form 6 September 2001 *** State Key Laboratory of Rolling & Automation Northeastern University Shenyang 110006 China

Two kinds of cold rolling experiments, single cold rolling and double cold rolling, were carried out on one titanium stabilized interstitial free (IF) steel that has been warm rolled at ferrite temperature. The main aim was to investigate the evolution of rolling and annealing textures from the well known behavior observed under single cold rolling condition to the less understood double cold rolling by using orientation distribution function (ODF). In the twice cold rolled samples, the annealing texture comprises only single {111}(110-112) r-fibre texture when it subjected to moderate reduction in the first round of rolling. Accordingly both the once cold rolled sample and the twice cold rolled sample with heavy reduction in the first round of rolling have much complex texture components. They are related to the formation of initial {111} subgrain and the priority growth of stable {111} nucleus.

关键词： double rolling cold rolling reduction deformation texture annealing texture r-value

STRAIN RATE SENSITIVITY OF ULTRAFINE-GRAINED Cu WITh NANOSIZED TWINS

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Acta Metallurgica Sinica(English Letters) 2006年第5期19卷 313-318页

作者： L.x. liu x.h. Chen L. Lu Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

An ultrafine-grained Cu sample with a high density of growth twins was synthesized by means of pulsed electrodeposition technique. The strain rate sensitivity of the Cu sample was measured by strain rate cycling tests under tension. The effects of grain size as well as twin density on the strength and strain rate sensitivity were discussed.

关键词： copper nanosized twin strain rate sensitivity deformation mechanism

Cell-fluid Interaction: Coupling Between the Deformation of an Adherent Leukocyte and the Shear Flow

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生物医学工程学杂志 2005年第S1期22卷 22-页

作者： x.h. liu~(1,2) h. hUANG~1 C. YU~1 M.J. ZOU~1 x. WANG~3 1(Institute of Biomedical Engineering, Center of West China Medical Sciences, Sichuan University, Chengdu 610041, China)2(Laboratory of Cardiovascular Diseases, West China hospital, Sichuan University, Chengdu 610041, China)3(LEMTA-UMR-CNRS 7563, Vandoeuvre-les-Nancy, 54500, BP160, France)

AN ADAPTIVE EFG-FE COUPLING METhOD FOR ThE NUMERICAL SIMULATION OF ExTRUSION PROCESSES

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Acta Metallurgica Sinica(English Letters) 2008年第5期21卷 380-388页

作者： L.C. liu x.h. Doug C.x. Li National Die ＆ Mold CAD Engineering Research Center Shanghai Jiaotong University Shanghai 200030 China

An adaptive EFG-FE coupling method is proposed and developed for the numerical simulation of lateral extrusion and forward-backward extrusion. Initially, the simulation has been implemented by using a conventional FE model. During the deforming process, mesh quality is checked at every incremental step. Distorted elements are automatically converted to EFG nodes, whereas, the less distorted elements are reserved. A new algorithm to generate EFG nodes and interface elements is presented. This method is capable of dealing with large deformation and has higher computational efficiency than using an EFG method wholly. Numerical results demonstrate that the adaptive EFG-FE coupling method has reasonable accuracy and is effective for local bulk metal forming such as extrusion processes.

关键词： Meshless method Coupling method Numerical simulation Extrusion process

Rational modulation of fluorophosphate cathode by anionic groups to reduce the polarization behavior for fast-charging sodium-ion batteries

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Journal of Energy Chemistry 2025年第1期100卷 509-521页

作者： xinyuan Wang Fan Zhang xingyu Zhou Qian Wang Changyu liu Yangyang liu hui Wang xiaojie liu Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education College of Chemistry & Materials Science Northwest University

Na3V2（PO4）2O2F （VP） is recognized as a promising cathode material for sodium-ion batteries due to its stable structural framework and high specific *** functional theory （DFT） and finite element simulations show that incorporating SO42-into VP decreases its band gap,lowers the migration energy barrier,and ensures a uniform Na+concentration gradient and stress distribution during charge and discharge ***,the average Na+diffusion coefficient of Na3V2（PO4）1.95（SO4）0.05O2F（VPS-1） is roughly double that of VP,leading to enhanced rate capability (80 C,75.5 mAh g-1) and cycling stability (111.0 mAh g-1capacity after 1000 cycles at 10 C current density) for ***-1 exhibits outstanding fast-charging capabilities,achieving an 80%state of charge in just 8.1 *** assembled VPS-1//SbSn/NPC full cell demonstrated stable cycling over 200 cycles at a high 5 C current,maintaining an average coulombic efficiency of 95.35%.

关键词： Anionic group modulation Polarization behavior Fast-charging Sodium-ion battery Fluorophosphate Cathode

Oxidation Resistance of Form-stable hightemperature Phase Change Thermal Energy Storage Materials Doped by Impregnated Graphite

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Journal of Wuhan University of Technology(Materials Science) 2025年第1期40卷 1-12页

作者： LI Baorang DAI Jianhuan ZhANG Wei liu xiangchen YANG liu School of Energy Power and Mechanical Engineering North China Electric Power UniversityBeijing 102206China School of Ener-gy and Environment Southeast UniversityNanjing 210096China

We adopted the solution impregnation route with aluminum dihydrogen phosphate solution as liquid medium for effective surface modification on graphite *** mass ratio of graphite to Al(h_(2)PO_(4))_(3) changed from 0.5:1 to 4:1,and the impregnation time changed from 1 to 7 *** typical composite phase change thermal storage materials doped with the as-treated graphite were fabricated using form-stable *** investigate the oxidation and anti-oxidation behavior of the impregnated graphite at high temperatures,the samples were put into a muffle furnace for a cyclic heat *** on SEM,EDS,DSC techniques,analyses on the impregnated technique suggested an optimized processing conditions of a 3 h impregnation time with the ratio of graphite:Al(h_(2)PO_(4))_(3) as 1:3 for graphite impregnation *** investigations on high-temperature phase change heat storage materials doped by the treated graphite suggested excellent oxidation resistance and thermal cycling performance.

关键词： phase change materials graphite impregnation method oxidation,sintering thermal analysis