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| 1 | MICROSTRUCTURE EVALUATION OF SEMI-SOLID STEEL MATERIALS IN ROLLING PROCESS AND THE RESULTING MECHANICAL PROPERTIES显示文摘The experimental study on the familiar 60Si2Mn and lCrl8Ni9Ti materials rolled in the semi-solid state was carried out. Experimental results show that the segregation of liquid occurs when the semi-solid slurry is rolled, which influences the microstructure and mechanics performance of workpiece under room temperature. The globular solid particles don’t present plastic deformation unless high solid fraction. At the same time, the mechanics property of workpiece is pretty good while the semi-solid slurry of 1Cr18Ni9Ti material is rolled by a pass and no other treatment. | R.B. Song, Y.L. Kang, J.L. Sun, A.M. Zhao and W.M. Mao School of Materials Science & Engineering, University of Science & Technology Beijing, Beijing 100083,China | 2001 | Acta Metallurgica Sinica(English Letters)2001，14，5： | 17 |
| 2 | Three-Dimensional Thermo-mechanical Coupled FEM Simulation for Hot Continuous Rolling of Large-Diameter Mandrel Bar显示文摘Based on the important boundary conditions of rolling simulation including friction, heat conduction and interactionsof the workpiece and rolls, the hot continuous rolling processes of large-diameter mandrel round bar (200 mm indiameter) in 6VH-stand hot tandem mill are successfully simulated by three-dimensional coupled thermomechanicalelastoplastic finite element method (FEM). The distributions of stress, strain, temperature and the rolling force andtorque for the two-pass and four-pass continuous rolling are calculated respectively. Thus, the two and four-passroll schedules are verified, respectively. The simulation results show that it is safe to produce 200 mm round barby the two-pass (oval pass and round pass) continuous rolling on the existing equipment compared to the four-passcontinuous rolling. There are concave surfaces and increased widths occurring at the end of rolled billet due touneven deformations between the outside and inside of the workpiece as well as the free spreading close to the rollgap of the final pass. | Huiping HONG Yonglin KANG Changtao FENG Xiqiang CHEN | 2003 | Journal of Materials Science & Technology2003，19，z1： | 13 |
| 3 | INFLUENCE OF COLD ROLLING TECHNOLOGY ON TEXTURE EVOLUTION OF IF STEEL显示文摘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. | 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 | 2002 | Acta Metallurgica Sinica(English Letters)2002，15，3： | 3 |
| 4 | A Semi-Analytical Method for the PDFs of A Ship Rolling in Random Oblique Waves显示文摘The PDFs(probability density functions) and probability of a ship rolling under the random parametric and forced excitations were studied by a semi-analytical method. The rolling motion equation of the ship in random oblique waves was established. The righting arm obtained by the numerical simulation was approximately fitted by an analytical function. The irregular waves were decomposed into two Gauss stationary random processes, and the CARMA(2, 1) model was used to fit the spectral density function of parametric and forced excitations. The stochastic energy envelope averaging method was used to solve the PDFs and the probability. The validity of the semi-analytical method was verified by the Monte Carlo method. The C11 ship was taken as an example, and the influences of the system parameters on the PDFs and probability were analyzed. The results show that the probability of ship rolling is affected by the characteristic wave height, wave length, and the heading angle. In order to provide proper advice for the ship's manoeuvring, the parametric excitations should be considered appropriately when the ship navigates in the oblique seas. | LIU Li-qin LIU Ya-liu XU Wan-hai LI Yan TANG You-gang | 2018 | China Ocean Engineering2018，32，1： | 2 |
| 5 | 3D Rigid-Plastic Finite Element Analysis for Skew Rolling Process of the Stepped Part显示文摘Based on rigid-plastic finite element method, a skew rolling process of stepped part is simulated. Considering nodesaving and effective remeshing, the tetrahedron solid elements are used to discrete workpiece. The workpiece material adopts rigid-plastic model, where the flow stress is function of effective strain, effective strain rate and temperature.The thermomechanical coupling is considered in the simulation. To model the spinning workpiece undergoing plastic deformation, a novel solution is presented and applied in this paper. The stress state in the workpiece and forming characteristic of skew rolling are analyzed. The forming load, including roller torque and forces in three directions are predicted. The above analyses are helpful to understanding of forming mechanisms and improving of process and die design. | Gang FANG Pan ZENG | 2003 | Journal of Materials Science & Technology2003，19，z1： | 2 |
| 6 | Generalized Mathematical Model for Hot Rolling Process of Plate显示文摘A generalized mathematical model is developed to predict the changes of temperature, rolling pressure, strain,strain rate, and austenite grain size for plate hot rolling and cooling processes. The model is established mainly by incorporating analytical and numerical method for differential equations under complicated boundary conditions. An industrial rolling and cooling process of plate is simulated by the model, in which the thickness of steel Q235B plate is rolled from initial 200 mm to final 12 mm by 13-passes in a two-high mill. The calculated results are in good agreement with measured data. Different from FEM simulation, the model takes very short time in calculation and makes the influence of rolling passes on precision to be very slight. | Zhenshan CUI Bingye XU | 2003 | Journal of Materials Science & Technology2003，19，z1： | 0 |
| 7 | Influence of Slope and Slenderness Ratio on the Non-Column Volume in Skew Rolling显示文摘A definition of non-column volume ratio (NCVR) is brought forward by the authors. It is influenced greatly by the slendernessratio of the cylindrical billet and the slope of the wedge on the tool of skew rolling. Using the numerical simulation, the lawof variation in NCVR during the forming process is found out. At the same time experiments have been carried out underdifferent conditions, the result of which are found to be in good agreement with the theoretical predictions. | Yongqiang KANG Zhenghuan HU Jinping LIU Cuiping YANG Huiping DU | 2003 | Journal of Materials Science & Technology2003，19，z1： | 0 |
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