通过在商业软件MSC.Marc基础上二次开发,建立了黏弹塑性三维热-力耦合有限元模型,模拟铸坯在二冷区的展宽状况.结果显示:铸坯的展宽主要产生于二冷区的前段,在前6个扇形段,铸坯的目标展宽率有逐渐增加的趋势;铸坯的展宽与厚度方向上的鼓肚密切相关;数值模拟使用的黏弹塑模型揭示铸坯展宽规律与铸坯实际变形相符,铸坯展宽是坯壳在钢液芯静压力作用下发生黏弹塑变形的结果.
The 3D viscoelastic-plastic thermal-mechanically coupled finite element model was established by a commercial software MSC.Marc on the basis of secondary development, and used to simulate the situation of slab's broadening in the secondary cooling zone. The results showed that the slab's broadening mainly emerged in the former segments of the secondary cooling zone, and the broadening rate has a gradually increasing trend from the first segment to the sixth segment. The broadening of slab has a close relationship with bulging along the thickness direction. The results simulated by using viscoelastic-plastic model revealed that the law of the slab's broadening is excellent agreement with the actual deformation. The broadening of slab is the result of viscoelastic-plastic deformation of the slab shell under the pressure of core of molten steel.
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