板坯连铸凝固过程微观组织参数的模拟研究

来源期刊：钢铁2010年第4期

论文作者：郭薇 张立峰 朱苗勇

文章页码：34 - 40

关键词：连铸； 凝固； 微观组织； 枝晶生长

Key words：steel continuous casting； solidification； microstructure； dendrite growth

摘    要：通过数学模型研究了在不同的凝固条件下中碳钢和300系列奥氏体不锈钢在凝固过程中的微观组织参数的变化关系,对枝晶生长速率、枝晶半径、二次枝晶臂间距、枝晶尖端温度、温度梯度等参数随坯壳生长的变化以及不同参数的改变对上述微观参数的影响进行了研究,并对两种钢种的微观组织参数进行了比较。结果表明由于不锈钢所具有的特殊组分和凝固特性使得其微观参数均比碳钢小,符合枝晶生长规律。

Abstract: A simplified numerical method for the dendrite growth was used to analyze and calculate some micro-structural parameters for both medium carbon steel and AISI304 type stainless steels under different casting conditions.The dendrite tip radius,dendrite growth velocity,dendrite arm spacing,temperature gradient and the dendrite tip temperature in the front of solid and liquid interface were investigated and comparisons of these parameters for the two steel grades were carried out.Parametric studies for these two steel grades were also discussed.The comparisons showed that the micro-structural parameter values of stainless steel were all smaller than that of the carbon steel due to its special compositions and solidification mode characteristics.