Numerical Simulation On Solidification Process In Continuous Casting Of Q345C Generous Slab

With the development of thick slab continuous casting technology, people pay more and moreattention to the control and research of continuous casting slab quality, the results showed that thehigh efficient continuous casting technology plays an important role in the continuous castingprocess of slab quality control. Slab crack are accounted for more than half of defects in continuouscasting billet, therefore it is important to control the crack and explore crack mechanism. Study onthe conditions of different solidification process in continuous casting process, such as castingtemperature and stress change, can be used for the parameter optimization of continuous castingprocess, cracks prevention and the quality control of casting billet, which provides the theory basisfor the development of continuous casting technology and the improvement of continuousproductivity.This paper takes a steel R9500thick slab continuous casting machine as the research object,uses finite element analysis software ANSYS and establishes the heavy slab continuous castingsolidification heat transfer model and the elastic-plastic stress model. The numerical simulation isfor the solidification process of mold, two district cooling and air cooling zone on the slabcontinuous casting. Simulating of the temperature field and the stress field distribution of heavybillet solidification process, we do analysis of continuous casting process parameters, such ascasting speed, superheat and quantity of on the solidification process, for the influence of thetemperature field and stress field distribution, to explore and prevent the causes of crack andimprove the quality of casting billet.The calculation results show that casting speed has a great influence on the billet temperatureand stress distribution. When casting speed increases, the slab surface temperature rise, the lengthof liquid core increases, shell thickness decreases, and the solidification shrinkage and theequivalent caused by contraction of the stress and strain values are decreased; Superheat andcooling water has little effect on the distribution on the billet temperature and stress, superheatincreased by10℃or water increased5%, the degree of the slab surface temperature is less than1%,and the amount of casting and solidification shrinkage stress and strain is small; the slab thicknessincreases, the slab mold temperature changes little, but in the air cooling zone due to the effect oflatent heat of solidification, it can give a great influence for the billet temperature distribution andshell growth. Simulation model fully consider the technological parameters of continuous castingproduction and actual production conditions, use two-dimensional slice method and take thecross section of the slab width and thickness for the analysis plane. The ANSYS numericalsimulation on the continuous casting process of the temperature field and stress field, can bedirectly clear showed the various points in the process of casting solidification temperaturedistribution, the growth of shell, the shell shrinkage and stress distribution of solidified shell.The calculation results are more accurate, it can be used to prevent the formation of defectssuch as cracks in the process of production, and adjust the continuous casting processparameters for certain reference value.