过热度与拉速对连铸特厚板微观组织的影响  

Effect of superheat and velocity on microstructure in the process of continuous casting

作　　者：徐学华[1] 刘赵卫[1] 何博[1] 高琦[1] 陈平虎[2] 黄诚[2] 李晓谦[2] 

机构地区：[1]中国重型机械研究院股份公司,陕西西安710032 [2]中南大学机电工程学院,湖南长沙410083

出　　处：《重型机械》2016年第3期50-54,共5页Heavy Machinery

摘　　要：连铸过程衡量温度场是否合理的两个重要参数为出结晶器时的坯壳厚度与整体液穴长度。本文基于有限元方法,采用移动边界法对2400 mm×400 mm特厚板坯的温度场进行模拟,探讨拉速与过热度对坯壳厚度、液穴深度及宏观组织的影响,并通过其模拟结果综合考虑选择合理地拉速与过热度参数。仿真结果表明:过热度为20℃、拉速为0.54 m/min的条件时,连铸坯内部质量及生产效率达到较好的状态,为今后连铸钢特厚大型板坯的生产提供理论基础。There are two important parameters that measuring whether the temperature filed is reasonable or not, which are the shell thickness and the liquid core length. This article is based on the finite element method, using the method of moving boundary to simulate the temperature field of the slab 2400 mm x 400 mm, effect of the casting speed and superheat degree on the shell thickness , the core depth and the macro-microstructure. The simulation results show that a better state to achieve internal quality and production efficiency of continuous casting billet with 20 ℃ superheat degree is and 0. 54 m/min casting speed, to provide a theoretical basis for cast steel thick and large slab production in the future.

关 键 词：凝固组织 过热度 铸造速度 数值模拟 

分 类 号：TF777.1[冶金工程—钢铁冶金]