The Experts below are selected from a list of 7581 Experts worldwide ranked by ideXlab platform
Qingxiang Yang - One of the best experts on this subject based on the ideXlab platform.
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Casting Speed optimal design of 304 stainless steel during twin roll strip Casting process by 3D modelling
Materials Science and Technology, 2014Co-Authors: Yuan-yuan Liu, Lingyu Liu, Jing Guo, Lianlian Liu, Yong Zhang, Y. Fang, Qingxiang YangAbstract:AbstractThe exit temperature distribution of 304 stainless steel during twin roll strip Casting process was measured. The crack morphology of the actual steel strip was observed by scanning electron microscope. Then, by establishing a three-dimensional model including Casting rollers, the flow and temperature fields of 304 stainless steel during the twin roll strip Casting process were modelled. The modelled temperature result is in accordance with the measured one, so the flow and temperature fields of 304 stainless steel during the twin roll Casting process with different Casting Speeds can be modelled. The results of the flow field show that a large area of vortex forms in the pool. Those of the temperature field show that the temperature in the vortex zone is lower 30–50°C than that in the refluxing zone, and a thin shell forms on the interface between the molten pool and the Casting roller. The whole temperature of the molten pool is increased with the increase in the Casting Speed, and an optimal ca...
Yuan-yuan Liu - One of the best experts on this subject based on the ideXlab platform.
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Casting Speed optimal design of 304 stainless steel during twin roll strip Casting process by 3D modelling
Materials Science and Technology, 2014Co-Authors: Yuan-yuan Liu, Lingyu Liu, Jing Guo, Lianlian Liu, Yong Zhang, Y. Fang, Qingxiang YangAbstract:AbstractThe exit temperature distribution of 304 stainless steel during twin roll strip Casting process was measured. The crack morphology of the actual steel strip was observed by scanning electron microscope. Then, by establishing a three-dimensional model including Casting rollers, the flow and temperature fields of 304 stainless steel during the twin roll strip Casting process were modelled. The modelled temperature result is in accordance with the measured one, so the flow and temperature fields of 304 stainless steel during the twin roll Casting process with different Casting Speeds can be modelled. The results of the flow field show that a large area of vortex forms in the pool. Those of the temperature field show that the temperature in the vortex zone is lower 30–50°C than that in the refluxing zone, and a thin shell forms on the interface between the molten pool and the Casting roller. The whole temperature of the molten pool is increased with the increase in the Casting Speed, and an optimal ca...
L Katgerman - One of the best experts on this subject based on the ideXlab platform.
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the effect of ramping Casting Speed and Casting temperature on temperature distribution and melt flow patterns in the sump of a dc cast billet
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2005Co-Authors: D G Eskin, L KatgermanAbstract:Abstract The interpretation of experimental results obtained upon direct-chill (DC) Casting frequently requires knowledge of the shape and position of liquidus and solidus isotherms and of the flow patterns in the billet sump. Computer simulations for the steady-state Casting conditions are usually used to obtain such information, although experiments are frequently performed under transient Casting conditions, e.g. at a ramping Casting Speed in order to promote hot tearing, which obviously results in a deviation from the steady-state condition. The first goal of this work is to examine by modelling the differences in temperature distribution and flow patterns in the billet sump occurring in the steady-state and under transient Casting conditions (caused by Casting Speed ramping) and to assess the implications of such differences for the structure and defect formation. The second goal is to evaluate the effect of the other important Casting parameter, Casting temperature, on the temperature and flow patterns during DC Casting. To achieve these two goals, the concept of a hybrid model proposed in [C.M. Oldenburg, F.J. Spera, Numer. Heat Transfer, Part B 21 (1992) 217–229] is employed, in which the so-called coherent solid fraction contour divides the two-phase region into the slurry region and the mushy zone. Good spatial resolution of the two-phase region in the calculations is achieved by unstructured meshing, which improve the accuracy of the calculation. The calculation results are discussed and compared with the results of previously reported experiments.
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structure formation and macrosegregation under different process conditions during dc Casting
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2004Co-Authors: D G Eskin, V.i. Savran, J Zuidema, L KatgermanAbstract:Abstract Billets of an Al–4.5 wt.% Cu alloy direct-chill cast under different process conditions were systematically examined. Effects of Casting Speed and water-flow rate on structure and macrosegregation profiles are studied and correlated to computer simulated solidification patterns. The results show that grain size, dendritic arm spacing, amount and size of pores tend to coarsen towards the center of a billet and with decreasing Casting Speed and water-flow rate. Both decreasing Casting Speed and water-flow rate produce less macrosegregation, although the effect of Casting Speed is much larger. Computer simulation was used to determine the geometry of the billet sump, temperature and melt flow patterns. Main parameters that influence the structure formation and macrosegregation during direct-chill Casting are shown to be the depths of the liquid pool and the sump, and the flow pattern in the slurry region. The appearance of coarse grains in the central part of the billet is explained from the transport of solid phase within the slurry region.
Jing Guo - One of the best experts on this subject based on the ideXlab platform.
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Casting Speed optimal design of 304 stainless steel during twin roll strip Casting process by 3D modelling
Materials Science and Technology, 2014Co-Authors: Yuan-yuan Liu, Lingyu Liu, Jing Guo, Lianlian Liu, Yong Zhang, Y. Fang, Qingxiang YangAbstract:AbstractThe exit temperature distribution of 304 stainless steel during twin roll strip Casting process was measured. The crack morphology of the actual steel strip was observed by scanning electron microscope. Then, by establishing a three-dimensional model including Casting rollers, the flow and temperature fields of 304 stainless steel during the twin roll strip Casting process were modelled. The modelled temperature result is in accordance with the measured one, so the flow and temperature fields of 304 stainless steel during the twin roll Casting process with different Casting Speeds can be modelled. The results of the flow field show that a large area of vortex forms in the pool. Those of the temperature field show that the temperature in the vortex zone is lower 30–50°C than that in the refluxing zone, and a thin shell forms on the interface between the molten pool and the Casting roller. The whole temperature of the molten pool is increased with the increase in the Casting Speed, and an optimal ca...
Lianlian Liu - One of the best experts on this subject based on the ideXlab platform.
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Casting Speed optimal design of 304 stainless steel during twin roll strip Casting process by 3D modelling
Materials Science and Technology, 2014Co-Authors: Yuan-yuan Liu, Lingyu Liu, Jing Guo, Lianlian Liu, Yong Zhang, Y. Fang, Qingxiang YangAbstract:AbstractThe exit temperature distribution of 304 stainless steel during twin roll strip Casting process was measured. The crack morphology of the actual steel strip was observed by scanning electron microscope. Then, by establishing a three-dimensional model including Casting rollers, the flow and temperature fields of 304 stainless steel during the twin roll strip Casting process were modelled. The modelled temperature result is in accordance with the measured one, so the flow and temperature fields of 304 stainless steel during the twin roll Casting process with different Casting Speeds can be modelled. The results of the flow field show that a large area of vortex forms in the pool. Those of the temperature field show that the temperature in the vortex zone is lower 30–50°C than that in the refluxing zone, and a thin shell forms on the interface between the molten pool and the Casting roller. The whole temperature of the molten pool is increased with the increase in the Casting Speed, and an optimal ca...