The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform
Siamak Serajzadeh - One of the best experts on this subject based on the ideXlab platform.
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A Study on Non-Isothermal Static Recrystallization During Hot Rolling of Carbon Steels
Materials and Manufacturing Processes, 2013Co-Authors: M. Meshkat, Siamak SerajzadehAbstract:In this article, the effects of Hot Rolling parameters on static recrystallization, mechanical properties, and final microstructures of a low carbon steel have been investigated. A numerical analysis was first employed to determine distributions of temperature, strain, and strain rate during Hot Rolling and then the predicted results were combined with the additivity rule together with Avrami equation to evaluate the progress of non-isothermal static recrystallization after Hot Rolling. In the next stage, Hot Rolling experiments have been performed under different Rolling conditions to assess the effects of Rolling layout on microstructures and mechanical properties of the rolled steel. The results indicate that temperature distribution and the kinetics of subsequent static recrystallization are significantly affected by the employed deformation rate during Hot Rolling. Furthermore, increasing Rolling speed alters flow stress and behavior of Hot rolled strip while yield stress increases and even the Luder...
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Modelling recrystallization kinetics during Hot Rolling of AA5083
Journal of Materials Processing Technology, 2007Co-Authors: M. Toloui, Siamak SerajzadehAbstract:Abstract In this work, a mathematical model has been developed to predict distributions of temperature, strain and strain rate during Hot Rolling as well as the subsequent microstructural changes after Hot deformation. For doing so, a 2-D finite element analysis together with a stream function method have been coupled to calculate temperature distribution and velocity field within the Rolling metal while the roll force has been estimated, through using an upper bound solution. Also the additivity rule and Avrami-type equation have been employed to predict the kinetics of static recrystallization after Hot Rolling. The model has been examined on AA5083. Hot Rolling experiments have been conducted under various Hot deformation conditions. Comparison between the theoretical results and the experimental data shows the validity of the model.
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A study on kinetics of static and metadynamic recrystallization during Hot Rolling
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2007Co-Authors: Siamak SerajzadehAbstract:A model has been developed for evaluation of recrystallization kinetics during Hot Rolling of a low carbon steel. For doing so, the finite difference and the finite element methods have been coupled to consider the interconnections among temperature, strain rate, strain and the kinetics of recrystallization within the steel under non-isothermal Hot Rolling conditions. To verify the model predictions, Hot Rolling experiments are carried out and the roll forces and microstructure of the rolled metal are compared with the predicted results. The comparison between the two sets of data shows a good agreement.
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Three-dimensional model for Hot Rolling of aluminum alloys
Materials & Design, 2007Co-Authors: Reza Riahifar, Siamak SerajzadehAbstract:This paper describes the application of three-dimensional finite element analysis in Hot slab Rolling of aluminum alloys. To assess the Rolling behavior of materials, finite element program Abaqus/Explicit has been employed and the Hot Rolling process was modeled in three dimensions. The temperature distribution, variation of flow stress, and flow pattern were determined during Hot Rolling of 6063 and 3003 aluminum alloys. Also, with the aid of the predicted results the geometrical changes and the Rolling forces were determined. To check the validity of the employed model and equations, Hot Rolling experiments were conducted and roll force and temperature of the samples have been measured and then compared with predicted results.
Suk-gyu Lee - One of the best experts on this subject based on the ideXlab platform.
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Tension Estimation of Interstand Strip in Looperless Hot Rolling Process Using SVR
Journal of Institute of Control Robotics and Systems, 2007Co-Authors: Dong-chang Han, Jun-hong Shim, Cheol-jae Park, Hae-doo Park, Suk-gyu LeeAbstract:This paper proposes a novel tension estimation of interstand strip in looperless Hot Rolling process using SVR(Support Vector Regression). The quality of Hot coil which is final product of Hot Rolling process is substantially decided by tension control of finishing Rolling in Hot Rolling process. The fluctuation of the strip tension in conventional Hot Rolling process is controlled by the strip tension measured by an inter-stand looper. However, the looper can cause a motor trip and tension hunting in Hot Rolling process, therefore, alternative method is essential to replace it. In this paper, the mathematical modeling of tension mechanism is implemented to estimate the tension using the proposed SVR algorithm without looper in Hot Rolling process. The simulation results show a reliable estimation performance and a possibility of tension control using SVR technique.
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A study of tension control in looperless Hot Rolling process using SVR
ICMIT 2005: Control Systems and Robotics, 2005Co-Authors: Joung Don Kim, Dong-chang Han, Jun-hong Shim, Cheol-jae Park, Hae-doo Park, Suk-gyu LeeAbstract:Final products of Hot Rolling process are produced to the form of Hot coil. The quality of Hot coil to be produced is decided by tension control of finishing Rolling in Hot Rolling process. The fluctuation of the strip tension in conventional Hot Rolling process is controlled through a looper located in between stands. But, the looper can cause a motor trip and tension hunting in Hot Rolling process, therefore, alternative method is essential. Hence, in this paper, the mathematical modeling of tension mechanism is implemented to estimate tension and to control tension using the proposed SVR algorithm without looper in Hot Rolling process. Also, results of the simulation show a performance of estimation and a possibility of tension control using SVR technique.
Akio Segawa - One of the best experts on this subject based on the ideXlab platform.
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Evaluation of Deformation Behavior of Oxide Scale in Hot Rolling Process by Vacuum Hot Rolling Mill
Procedia Engineering, 2014Co-Authors: Takuya Kurotsu, Akio SegawaAbstract:Abstract A method for reproduce the oxide scale in Hot Rolling is proposed using the vacuum Hot Rolling mill. This method is possible to control of scale thickness and chemical composition in actual Hot Rolling process.From results, it is possible to clear the deformation behavior of state generated the oxide scale, oxide scale thickness is thick enough amount of Fe2O3 billets. The oxide scale thickness is proportional to the amount of Fe2O3. Some cracks appeared before the roll bite during Rolling the oxide scale. Then, peeling or destruction occurred in roll bite for roll exit.
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Reproduction and Deformation Characteristics of Oxide Scale in Hot Rolling Using Vacuum Rolling Mill
Materials Science Forum, 2011Co-Authors: Akio SegawaAbstract:There is fear that the oxide scale formed in Hot Rolling causes adverse effects for surface properties of final product. In Hot Rolling, the sheet surface is occurred reoxidation after descaling. Therefore, the oxide scale is rolled together, and causes the surface defect. In this study, the method for reproducing the oxide scale in Hot Rolling is proposed by a vacuum Hot Rolling mill, named the scale transfer method, and focused on the deformation of the oxide scale itself. As the results, it’s possible to reproduce the oxide scale in the actual Hot Rolling process. It showed that causes the new surface defect for invading the oxide scale in the sheet surface during roll bite.
Tu Nai-wei - One of the best experts on this subject based on the ideXlab platform.
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Model and hybrid algorithm for Hot Rolling lot planning
Journal of systems engineering, 2011Co-Authors: Tu Nai-weiAbstract:Hot Rolling lot planning is analyzed and a prize collecting vehicle routing problem(PCVRP) model with uncertain Rolling planning numbers for Hot Rolling lot planning is proposed.The model considers a lot of production process constraints and production targets.A hybrid algorithm based on simulated annealing(SA) and ant colony optimization(ACO) is proposed for solving the model.In the hybrid algorithm,simulated annealing is used to search the initial solution of Hot Rolling lot planning to form the initial information pheromone,ant colony optimization is used to search the global optimal solution.Simulated annealing employs certain probability to avoid becoming trapped in a local optimum in ant colony optimization.The experimental results show that the model and the hybrid algorithm are effective for Hot Rolling lot planning.
Dong-chang Han - One of the best experts on this subject based on the ideXlab platform.
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Tension Estimation of Interstand Strip in Looperless Hot Rolling Process Using SVR
Journal of Institute of Control Robotics and Systems, 2007Co-Authors: Dong-chang Han, Jun-hong Shim, Cheol-jae Park, Hae-doo Park, Suk-gyu LeeAbstract:This paper proposes a novel tension estimation of interstand strip in looperless Hot Rolling process using SVR(Support Vector Regression). The quality of Hot coil which is final product of Hot Rolling process is substantially decided by tension control of finishing Rolling in Hot Rolling process. The fluctuation of the strip tension in conventional Hot Rolling process is controlled by the strip tension measured by an inter-stand looper. However, the looper can cause a motor trip and tension hunting in Hot Rolling process, therefore, alternative method is essential to replace it. In this paper, the mathematical modeling of tension mechanism is implemented to estimate the tension using the proposed SVR algorithm without looper in Hot Rolling process. The simulation results show a reliable estimation performance and a possibility of tension control using SVR technique.
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A study of tension control in looperless Hot Rolling process using SVR
ICMIT 2005: Control Systems and Robotics, 2005Co-Authors: Joung Don Kim, Dong-chang Han, Jun-hong Shim, Cheol-jae Park, Hae-doo Park, Suk-gyu LeeAbstract:Final products of Hot Rolling process are produced to the form of Hot coil. The quality of Hot coil to be produced is decided by tension control of finishing Rolling in Hot Rolling process. The fluctuation of the strip tension in conventional Hot Rolling process is controlled through a looper located in between stands. But, the looper can cause a motor trip and tension hunting in Hot Rolling process, therefore, alternative method is essential. Hence, in this paper, the mathematical modeling of tension mechanism is implemented to estimate tension and to control tension using the proposed SVR algorithm without looper in Hot Rolling process. Also, results of the simulation show a performance of estimation and a possibility of tension control using SVR technique.
