带液芯连铸坯凝固过程凝固前沿动态施压模型的开发

摘要

运用固定网格法开发带液芯连铸坯凝固前沿动态施压模型,实现连铸过程钢水静压力的动态施加,并以此为基础对连铸坯凝固过程热-力耦合进行数值仿真.计算结果显示,热应力在铸坯出结晶器进入足辊区后达到最大值,且铸坯角部的热应力值要远高于其他位置.分析可知,铸坯各部位的开裂危险区段不同,当局部热应力值超过抗拉强度时易产生裂纹.角部热应力最高产生裂纹倾向最大,这与钢厂实际生产时铸坯角部易产生裂纹缺陷的现状相符.%The model of solidification front dynamic pressure in the solidification process of continuous cast slab with liquid core was developed by the fixed mesh method.The dynamic simulation on thermo-machnical coupling in solidification process of the continuous casting slab was carried out based on the dynamic application of ferrostatic pressure.The calculated results showed that the thermal stress reached the maximum after the slab get out the mold and enter the foot roller zone,and the thermal stress value at the corner of the slab was much higher than that of the other locations of the slab.Analysis on the results showed that different parts of the slab have the different trends to cracking.When the local thermal stress exceeded the tensile strength,the slab surface was easy to crack.Thermal stress at the corner of slab has the highest tendency to crack,which was consistent with the status that the corner of slab in the factory production has the most defects.