Numerical Simulation On The Temperature And Stress Field In Solidification Process Of Slab Continuous Casting

Continuous casting is one of the most active technologies in steel industry. Duringthe continuous casting process, temperature and the change of solidified shell thicknesshave a signification impact to improve production process, and the stress of solidifiedshell also has a direct impact on the quality of the casting.With the R9300 vertical-bending slab caster as the research object, who produce theslab of steel grade Q235, which thickness is 230mm and width is 1000mm at the1.5m/min casting speed. The two-dimension heat transfer model in the slab continuouscasting is built based on the mind of setting slices on the slab along the casting directionby ANSYS Finite-Element software, and through the analysis of the solidification-heattransfer problem of the slab and using Finite-Element software to solve and calculate toget the cross-section temperature field of casting slab from the meniscus of mould to theend of horizontal section.Based on two-dimensional temperature field, consideration of the impact ofmechanical behavior of slab at the high temperature, the contact state between slab androller, the static pressure of liquid steel, two-dimensional horizontal thermalelastic-plastic stress model of slab were established. The static pressure of liquid steelwas received by means of the pressure on the internal surface of the solidified shell, andthe internal surface get by birth and death technology killed Liquid core elements. Andthrough finite element numerical simulation and calculation of two-dimensionalhorizontal thermal elastic-plastic stress model of slab, getting the stress fields under thecross section of mold and particular roll position.In order to further improve precision of the continuous casting slab’s stress fields inthe finite element simulation, consideration of the impact of heat transfer and stress of theslab along the casting direction, changing two-dimensional temperature field intothree-dimensional temperature field through ANSYS Parametric Design Language. Basedon same material properties, same boundary conditions and same conversion method ofloads, three-dimensional thermal elastic-plastic stress models of slab were established. And using three-dimensional thermal elastic-plastic stress models to solve the detailedstresses of the slabs who lie to bending transition zone at the earlier stage of solidificationand straightening zone at the later stage of solidification.In the paper, consideration of the impact of various process parameters, puttingforward effective numerical simulation method for getting the three-dimensional stressfields of the slab, obtaining the simulation results of intuitive hot and force, these notonly acquire reliable basis for judging the fatigue of the slab, but also provide importanttheoretical guidance for the engineering design of the slab caster.