超高速薄板坯连铸结晶器内的坯壳形变行为  

Slab shell deformation behavior in ultra-high speed thin slab continuous casting mold

作　　者：刘增勋 杨垚森 肖鹏程 朱立光 朱荣[3] LIU Zengxun;YANG Yaosen;XIAO Pengcheng;ZHU Liguang;ZHU Rong(College of Metallurgy and Energy,North China University of Science and Technology,Tangshan 063210,China;School of Materials Science and Engineering,Hebei University of Science and Technology,Shijiazhuang 050018,China;School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]华北理工大学冶金与能源学院,河北唐山063210 [2]河北科技大学材料科学与工程学院,河北石家庄050018 [3]北京科技大学冶金与生态学院,北京100083

出　　处：《炼钢》2023年第3期58-65,共8页Steelmaking

基　　金：国家自然科学基金资助项目(51904107);河北省自然科学基金资助项目(E2020209005,E2021209094);河北省高等学校科学技术研究项目(BJ2019041);河北省“三三三人才工程”资助项目(A202102002);唐山市人才资助重点项目(A202010004)。

摘　　要：针对薄板坯漏斗型结晶器内,漏斗区坯壳受到挤压形状变化,铸坯表面裂纹发生机率极大增加的问题。基于节点温度继承和接触算法,建立了一种新的薄板坯漏斗型结晶器内的三维应力分析模型,解析了FTSC结晶器内铸坯的传热和形变行为。结果表明:高拉速条件下,漏斗过渡区的坯壳在结晶器上部呈现向平行区偏移趋势,并随着坯壳向下行至结晶器中部开始反向移动。在拉速为4.0~6.0 m/min的条件下,随着拉速的增加,坯壳向漏斗区方向位移量减小,位移方向偏转的转折点由结晶器液面下300 mm下降至600 mm处;在结晶器出口处,坯壳宽面中心、窄面中心及角部的温度上升明显;坯壳厚度减薄;角部气隙的厚度减薄,坯壳第一主应力增加。针对位移形变,通过补偿角部延展的形变空间设计新的窄面铜板应用于生产,铸坯角部裂纹的比例由21.3%下降到0.5%。For the thin slab funnel-shaped mold,the slab shell in the funnel area is squeezed and deformed,and the probability of the occurrence of surface cracks on the cast slab is greatly increased.A new three-dimensional stress analysis model based on nodal temperature inheritance and contact algorithm was developed to analyze the heat transfer and deformation behavior of the slab in the FTSC mold.The results show that the slab shells in the transition zone of the funnel show a tendency to shift toward the parallel zone in the upper part of the mold under the high casting speed condition,and start to move in the opposite direction as the slab shells travel down to the middle of the mold.At the casting speed of 4.0-6.0 m/min,with the increase of casting speed,the displacement of the shell towards the funnel zone decreases,and the turning point of the deflection of the displacement direction decreases from 300 mm to 600 mm below the liquid level of the mold.At the exit of the mold,the temperature of the wide surface center,the narrow surface center and the corner of the shell increases significantly.The thickness of the shell thins,the thickness of the air gap of the corner thins,and the first main stress of the shell increases.In response to the displacement deformation,a new narrow face copper plate was designed and applied to the production by compensating the deformation space of the corner extension,and the percentage of corner cracks in the slab was reduced from 21.3%to 0.5%.

关 键 词：高速薄板坯 三维应力场 坯壳挤压 气隙分布 横向位移 

分 类 号：TF777.2[冶金工程—钢铁冶金]