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为了更加有效控制和减少连铸坯的角部横裂纹质量缺陷,根据其形成的机制,针对两种新型铸坯模型,即圆角和倒角模型进行研究。通过建立特厚连铸矩形坯在凝固过程的传热模型并进行数值模拟,得到铸坯在凝固过程沿拉速方向上温度场和坯壳厚度的分布规律,并在此基础上建立热力耦合模型,分析铸坯的应力变化,讨论了产生裂纹的可能性。研究结果表明,通过对比传统直角模型,得出圆角和倒角模型对铸坯角部温度场和应力场两个方面的分布状况都有改善,即新铸坯模型角部温度在连铸矫直段有效避开了钢的高温脆性区,同时降低了铸坯角部的应力值,减小了角部裂纹产生的可能性。
In order to more effectively control and reduce the quality defects of the corner crack of the slab, two new cast slab models, namely fillet and chamfer model, were studied according to the forming mechanism. Through the establishment of the heat transfer model and the numerical simulation of the continuous casting rectangular billet in the solidification process, the distribution law of the temperature field and the thickness of the billet in the direction of pulling speed of the billet during the solidification process is obtained. Based on this, the thermal coupling model , Analysis of the stress changes in slab, discussed the possibility of cracks. The results show that, compared with the traditional rectangular model, it can be concluded that the fillet and chamfer model have improved the distribution of temperature and stress field in the corner of the slab, that is, The straight section effectively avoids the high temperature brittle zone of the steel, meanwhile, reduces the stress value at the corner of the slab and reduces the possibility of corner crack.