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为了控制梅钢1 650板坯连铸包晶钢过程铸坯内裂纹发生,基于梅钢1 650板坯连铸机生产实际,建立了1 560mm×230mm断面包晶钢铸坯凝固过程三维热/力耦合有限元模型,揭示了铸坯凝固过程各冷却区内的温度场分布规律和铸坯压下过程应力与变形行为演变规律。结果表明,铸坯在结晶器及零段内冷却强度大,沿拉坯及其垂直方向的温度分布梯度大;在实施铸坯凝固末端压下过程中,铸坯宽面中心与宽向1/4处的表面变形及应力变化较为同步,且靠近铸坯内弧侧凝固前沿的塑性应变最大,铸坯应力最大值集中在角部区域;目前梅钢包晶钢连铸压下区间设置不当,易引发铸坯产生内部裂纹。
In order to control the crack occurrence in 1 650 slab continuous casting peritectic steel in Meishan Iron and Steel Co., Ltd., Based on the actual production of 1 650 slab caster in Meisteel, the three-dimensional hot / Force coupling finite element model to reveal the distribution law of the temperature field in each cooling zone during the slab solidification and the evolution law of stress and deformation behavior during slab pressing. The results show that the slab has large cooling strength in the mold and zero section and large temperature gradient along the slab and in the vertical direction. In the process of final reduction of slab solidification, 4 surface deformation and stress changes are more synchronized, and close to the inner edge of the slab in the solidification front of the arc at the maximum plastic strain, slab stress maximum concentrated in the corner region; at present, the plummet ingot casting continuous casting range setting is not easy, easy Initiate slab produce internal cracks.