Papers by Keyword: Continuous Casting

Abstract: Research group of Metallurgy at Aalto University has been developing simulation models and tools for continuous casting since from the early 80s. The main models developed are the heat transfer model, DYN3D, and the solidification and microstructure model IDS. The models have been further developed and integrated to a continuous casting simulator and to a slab simulator. The continuous casting simulator calculates the important phenomena taking place in the strand during casting and the slab simulator calculates the phenomena taking place in the slabs when they are transferred from caster to reheating furnace. The numerical solution algorithms in the simulators are so fast that they can be used in on-line applications. The simulators have today many new options as hydrogen removal and quality prediction modules. In this paper, the simulators and their modules are presented.

Abstract: A porous aluminum alloy was fabricated by joining pure aluminum pipes and Al-13mass% Si melt through continuous casting. Compressive tests were carried out with test specimens of the porous aluminum alloy fabricated by this method, non-porous aluminum alloy fabricated by continuous casting using Al-Si melt, and porous aluminum alloy consisting of only Al-Si fabricated by drilling non-porous Al-Si bar. From the compressive tests, it was confirmed that specific proof strength of the porous aluminum alloy fabricated by joining pipes and melt can be described by rule of mixture of Al-Si base metal, pure aluminium pipes and pores.

Abstract: This paper focus on the water distribution of secondary cooling for beam blank continuous casting process. Analysis of the influencing factors and initial determination method for important parameters of secondary cooling water, including specific water, water ratio in each secondary cooling zoon and the amount of water in outer arc, inner arc and sider at one secondary cooling zoon. After that, according to the simulation heat transfer process of the secondary cooling, to improve the secondary cooling system is given. This work provides a reference to the development of secondary cooling system.

Abstract: Hot compression deformation test were conducted on 20CrMo alloy steel on a Gleeble-1500D thermal simulator when the deformation amount was 30%, temperature ranged from 1273 to 1373K and strain rate from 0.0015 to 0.015s^-1. Flow stress curves were obtained under different deformation conditions; DRX activation energy was calculated using mathematical method. The starting time of DRX was analyzed and the kinetic equation of DRX was established. This model fits well with test data and can meet the requirement of engineering calculation.

Abstract: In this paper is compared residence times of tundish equipped with Turbostop and tundish equipped with experimental swirl chamber. Set of measurements in this paper was performed in the Laboratory simulated flow processes (LSSP). Water model is assembled at scale 1:3 to original. Measurements were evaluated by graphical measuring of water conductivity variation at tundish inlet and outlet by adding potassium chloride into tundish inlet and visually where KMnO4 was used as an indicator.

Abstract: In order to predict and control the temperature of continuous casting slab, a mathematical heat transfer model simulating the solidification process of continuous casting slab has been developed based on the realistic roller-layout and spray nozzle distribution. And the accuracy has been verified by comparing with the pin-shooting experiment results. An advanced control strategies are adopted to achieve the optimization of water quantity under different production conditions by the integration of energy saving water distribution module and slab temperature optimization module in the dynamic secondary cooling model. The total water consumption has a trend of dropping off after the utilization of the optimization technique. And the slab surface temperature increases which fits for the down stream direct hot rolling.

Abstract: This work is focused to evaluate heat removal simulation on the continuous casting process of stell, which is the most used method to produce big mounts of steel.The understanding of steel thermal behavior is very important in order to control the industrial processing and guarantee steel quality, here different mechanism are involved such as radiation,forced convection and conduction.A finite difference method easy to program is used to solve the simulation.This calculation is also coupled a with virtual kinematics model in order to create a more realistic simulation.Finally computer tools were programmed to save and display graphically the steel thermal behavior.

Abstract: The present work illustrates the procedure to simulate computationally the continuous casting process of metals.This is the most popular method to produce metals ingot without interruption. This procedure is useful to cast metals and alloys such as steel and aluminum.The algorithms have been developed to provide appropriated and efficient tools for reading data and display the simulation on the screen using a graphical user interphase(GUI).Analysis of the industrial processing allows to test and correct probable situations avoiding problems and risks;moreover computer simulation allows to identify critical aspect of the kinematics procedure and evaluate productivity.

Abstract: In order to improve design efficiency and reduce design cost, a new method combining numerical simulation with experimental verification was proposed in this study. Firstly, controllable process parameters such as continuous casting speed and cooling water flow rate, are robustly designed according to the numerical simulation results of flow field, process experiments were subsequently done on a newly developed continuous casting machine of lead slice, then the robust optimal design for the continuous casting process were gained. The results show that the cooling water flow significantly affects axial thickness of the lead slice, while the casting speed determines mainly its circumferential thickness. When the casting speed is between 280L/min and 320L/min, and the cooling water flow rate is between 950r/min and 1100r/min at the same time, the axial thickness and circumferential thickness can been kept respectively in1.0±0.03mm and 1.0±0.1mm, which meet the robust design requirements.

Abstract: In this study, the variation of workability of semi-continuously casted and extruded ZK60A magnesium alloy was investigated. To determine the deformation capability of two different billets, uniaxial compression tests were conducted at elevated temperatures and two different strain rates. In addition, the microstructural evolution was investigated using electron backscatter diffraction (EBSD) to compare the microstructure before and after the extrusion. The formability of ZK60A depending on the microstructure is discussed based on the experimental results obtained in this study, and is compared with earlier research in the literature.