Mathematical Modeling on Deformation Behavior of Solidified Shell in Continuous Slab Casting with Soft Reduction
Mathematical Modeling on Deformation Behavior of Solidified Shell in Continuous Slab Casting with Soft Reduction
复制标题
板坯连铸轻压下凝固壳变形行为的数学模型
DOI：
10.1515/htmp-2016-0140
复制
发表时间：
2017
影响因子：
1.5
通讯作者：
Jin Yan
中科院分区：
文献类型：
--
作者：
Cheng Changgui;Zhang Feng;Li Yang;Chen Ying;Jin Yan
本文在板坯连铸轻压下二维非稳态传热模型计算结果的基础上，建立了热弹塑性耦合数学模型，研究了压下量和铸坯中心固相分数对凝固坯壳变形行为的影响。计算结果表明，压下量不变时，板坯宽度中心区域沿厚度方向的位移沿着变化不大，然后逐渐增大，在距板坯窄面较远的0.075 m处出现位移峰值，最后在板坯窄面附近位移急剧减小。 当固相分数相同时，随着压下量的增加，凝固壳向铸坯宽度和厚度方向的位移量增大。当固相分数为0.3时，还原区的还原量分别为0.15 mm和0.25 mm，有效还原效率从0.463降低到0.436。 当总压下量为5mm时，固相分数从0.3变化到0.7，凝固前沿累积位移从0.238mm增加到0.805mm，压下效率从0.46降低到0.32。
Abstract Based on the calculation results of the two-dimensional unsteady heat transfer model for continuous slab casting with soft reduction process, a coupled thermo-elastic-plastic mathematical model has been developed to study the effects of the reduction amount and solid phase fraction in slab centerline on the deformation behavior of solidification shell in this paper. The calculated results show that the displacement along thickness direction of slab changes little in width center region of slab when the reduction amount keeps constant, then it increases and a peak of displacement appears in 0.075 m whose distance is far from the slab narrow face, finally, it decreases severely near the narrow face of slab. When the solid phase fraction is the same, the displacement of solidification shell toward to the width and thickness direction of slab increases with the increasing of reduction amount. When the solid phase fraction is 0.3, the reduction amount in reduction subzone is 0.15 mm and 0.25 mm, respectively, the effective reduction efficiency decreases from 0.463 to 0.436. When the total reduction amount is 5 mm, the solid phase fraction varies from 0.3 to 0.7, the accumulated displacement of solidification front increases from 0.238 mm to 0.805 mm, the reduction efficiency decreases from 0.46 to 0.32.