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首页> 外文会议>International Conference on Microalloying for New Steel Processes and Applications; 20050907-09; Basque Country(ES) >Modeling of the Microstructural Evolution and Mean Flow Stress during Thin Slab Casting/Direct Rolling of Niobium Microalloyed Steels
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Modeling of the Microstructural Evolution and Mean Flow Stress during Thin Slab Casting/Direct Rolling of Niobium Microalloyed Steels

机译：铌微合金钢薄板坯连铸/直接轧制过程中的组织演变和平均流变应力建模

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摘要

Mill logs obtained from the Hylsa CSP™ (thin slab casting/direct rolling - TSC/DR) mill were examined so that the mean flow stresses at each pass were calculated using the Sims equation modified to take into account the forward slip ratio, the redundant strain and the work roll flattening. The mean flow stresses were then compared to predicted values obtained from a model. The microstructures during the CSP process were predicted by a mathematical model which was initially derived for conventional slab/roughing mill/hot strip mill (HSM) processing route. The adapted model takes into account the deformation of the as-cast structure in the finishing CSP mill, by using particular microstructural equations to calculate the softening kinetics and grain sizes. The main metallurgical features such as the occurrence of Nb(C,N) precipitation, the softening mechanism which takes place (static or metadynamic recrystallization) as well as the strain accumulation between passes were calculated. The mean-flow-stress results obtained from the calculations are in good agreement with the mill data. The present analysis indicates that it is possible to produce fine-grained microalloyed steels with homogeneous microstructure in thin slab casting/direct rolling processing.
机译：检查了从Hylsa CSP™（薄板坯连铸/直接轧制-TSC / DR）轧机获得的轧机原木，以便使用经过改进的Sims方程计算每道次的平均流动应力，该方程考虑了前向滑移率，冗余应变和工作辊变平。然后将平均流应力与从模型获得的预测值进行比较。 CSP过程中的微观结构是通过数学模型预测的，该数学模型最初是针对常规板坯/粗轧机/热轧机（HSM）加工路线而得出的。改编后的模型通过使用特定的微结构方程来计算软化动力学和晶粒尺寸，从而考虑了CSP精轧机中铸态组织的变形。计算了主要的冶金特征，例如Nb（C，N）析出的发生，发生的软化机理（静态或亚动力学重结晶）以及道次之间的应变累积。计算得出的平均流应力结果与轧机数据非常吻合。目前的分析表明，可以在薄板坯连铸/直接轧制过程中生产出具有均匀组织的细晶粒微合金钢。

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