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采用三维有限元技术,研究了连铸过程中高温区δ铁素体含量对钢水凝固的影响。通过对316不锈钢板坯浇铸过程的模拟,获得了凝固过程中δ铁素体含量对坯壳出口温度、角部温度及坯壳厚度变化的影响规律。研究发现铁素体含量能够极大增加坯壳纵向温度,但对横向温度的梯度的变化影响较小。通过分析横向温度的变化,确定在距角部40 mm左右处坯壳最薄。同时,也研究了出口坯壳厚度变化规律,随着δ铁素体含量的增加,出口处坯壳厚度逐渐减小,厚度差逐渐变大。
The effect of δ ferrite content on the solidification of molten steel during the continuous casting process was studied by using the three-dimensional finite element method. Through the simulation of 316 stainless steel slab casting process, the effect of δ ferrite content on the exit temperature, corner temperature and the change of shell thickness during solidification was obtained. The results show that the ferrite content can greatly increase the longitudinal temperature of the shell, but has little effect on the gradient of the lateral temperature. By analyzing the change of transverse temperature, it is determined that the shell is the thinnest at a distance of about 40 mm from the corner. At the same time, the variation law of the thickness of the exported blank shell was also studied. With the increase of δ-ferrite content, the thickness of the blank shell at the exit gradually decreased and the thickness difference became larger.