Study On Thermodynamic Simulation Of Sliding Plate For Ladle Based On ANSYS Program

The sliding plate plays a role in directly controlling the flow and velocity of the molten steel in the ladle during the pouring process,and is a key component of the sliding nozzle mechanism.In the process of steel pouring,the severe thermal impact of high temperature molten steel will cause high thermal stress in the sliding plate,which is one of the important factors affecting the service life of the sliding plate.However,the thermal stress on the sliding plate during casting can only be predicted by thermal shock experiments at 1100? without detection device.However,there are many influencing factors in the steel casting process,which reduces the accuracy of the prediction.This paper uses ANSYS software to simulate and analyze the four different material sliding plates(aluminum-zirconium-carbon,magnesium-carbon,aluminum-carbon,magnesium aluminate spinel)whose temperature field and thermal stress field,and provide a theoretical basis for the safe use of sliding plate.In this paper,the temperature field and thermal stress field distribution characteristics of the four kinds of sliding plates are discussed,and the mechanism of cracks under the action of thermal stress,and the microstructure analysis of the aluminum-zirconium-carbon sliding plate with the least thermal stress is carried out by SEM.Draw the following conclusions:(1)The temperature field distribution of the sliding plate is affected by the thermal conductivity.Among the four material sliding plates,the thermal conductivity of magnesium-carbon is the largest,the surface temperature is high,the thermal conductivity of spinel and aluminum-zirconium-carbon is small,the surface temperature is relatively low..(2)During the casting process of the four material sliding plates,the inner surface of the injection hole is subjected to a relatively large compressive stress.As the steel is poured,the inner surface compressive stress gradually decreases,and the range of action gradually increases;The remaining parts are subjected to tensile stress.The ring-shaped area 40-60mm from the center of the injection hole is the maximum tensile stress area.The tensile stress concentration area provides energy for the formation of "crack nuclei".The maximum tensile stress acts outside the maximum tensile stress area as the pouring time increases expansion.The active area gradually decreases,further aggravating the tensile stress concentration phenomenon,so that the micro cracks expand to form large cracks,causing damage to the slide plate.(3)Under the same casting conditions,the spinel slide plate receives the largest compressive stress and tensile stress,followed by aluminum-carbon and magnesium-carbon.Aluminum-zirconium-carbon slides receive the least compressive and tensile stress,and aluminum-zirconium-carbon slides resist thermal shock.(4)After casting steel,the aluminum-zirconium-carbon slide plate has obvious macro cracks,and the slide side is seriously damaged.The cracks diverge in the diameter direction with the injection hole as the center.The crack penetrates the entire thickness of the slide plate,indicating that the slide plate is injected on the greater stress during the steel casting process;The internal mesh cracks of the aluminum-zirconium-carbon slide plate cause aggregate fragmentation.There are both intercrystalline and transcrystalline cracks between the longitudinal(slide direction)aggregate and the matrix.There is no transverse mesh crack to form bones.The cracks between the material and the matrix are mainly along the crystal.There are no network cracks and large cracks on the sliding plate where the thermal stress is small,but there are micro-cracks between the small-grained aggregate and the matrix,which will form the source of the cracks.This is the serious crack of the sliding plate in the larger thermal stress area obtained by the simulation that consistent with the obvious damage location.The damage of the aluminum-zirconium-carbon slide plate is caused by high temperature and repeated thermal shocks,which cause cracks in the large thermal stress area of the material.The cracks continue to grow with the continuous cracking of the cast steel,which eventually leads to damage.(5)Therefore,aluminum-zirconium-carbon materials with low thermal conductivity and high tensile strength should be selected in the area where the thermal stress is large.