宽厚板连铸坯鼓肚变形数值计算研究  

Investigation on the bulging deformation of continuously cast wide-thick slab with numerical calculation method

作　　者：马晓涛 吴晨辉 谢鑫 吴国荣 张敏 曾建华 祭程 Ma Xiaotao;Wu Chenhui;Xie Xin;Wu Guorong;Zhang Min;Zeng Jianhua;Ji Chen(Pangang Group Co.,Ltd.,Panzhihua 617022,Sichuan,China;Panzhihua Iron and Steel Research Institute Co.,Ltd.,Panzhihua 617000,Sichuan,China;School of Metallugy,Northeastern University,Shenyang 110819,Liaoning,China)

机构地区：[1]攀钢集团有限公司,四川攀枝花617022 [2]攀枝花钢铁研究院有限公司,四川攀枝花617000 [3]东北大学冶金学院,辽宁沈阳110819

出　　处：《钢铁钒钛》2021年第1期106-112,共7页Iron Steel Vanadium Titanium

摘　　要：连铸过程中铸坯已凝固,坯壳在钢水静压力作用下发生鼓肚变形,影响浇铸过程顺行与铸坯质量。以宽厚板连铸坯为对象,采用数值计算方法定量研究了其在连铸过程三个典型铸流位置L1 (弯曲位置)、L2 (弧形段中间位置)、L3 (矫直位置)的鼓肚变形规律。由L1至L3,坯壳鼓肚变形及其导致的凝固前沿拉伸应变均不断增加。凝固前沿厚度方向拉伸应变ε_(xx)、拉坯方向拉伸应变ε_(yy)与宽度方向拉伸应变ε_(zz)呈集中分布趋势,三者分别加剧三角区裂纹、中间裂纹及角部裂纹风险。随着拉速由0.7 m/min增大至0.9 m/min,宽面坯壳鼓肚变形与ε_(xx)、ε_(zz)先增加后减小,而窄面坯壳鼓肚变形与ε_(yy)持续增大。In continuous casting process, bulging deformation of the solidified shell occurs due to the ferrostatic pressure, which influences the smooth production and the internal quality of the continuously cast steel. In the present work, the continuously casting wide-thick slab was taken as the research object,and its bulging deformation at three typical strand positions L1(bending region), L2(middle of the bow region) and L3(straightening region) was quantitatively investigated with numerical calculation method.Bulging deformation of the solidified shell and the tensile strain distribution on the solidification front continuously increase from L1 to L3. The tensile strain along the slab thickness direction(ε_(xx)), along the casting direction(ε_(yy)) and along the slab width direction(ε_(zz)) present a characteristic of concentrated distribution and increase the risk of inducing triple-point cracks, midway cracks and internal corner cracks,respectively. With the casting speed increased from 0.7 m/min to 0.9 m/min, bulging deformation of the wide surface of the solidified shell and ε_(xx), ε_(zz) firstly increase and then decrease, but the bulging deformation of the narrow surface of the solidified shell and ε_(yy) continuously increase.

关 键 词：连铸 宽厚板坯 鼓肚 内裂纹 数值计算 

分 类 号：TF777[冶金工程—钢铁冶金]