摘要
铸钢凝固过程的溶质再分配是产生宏观偏析的根本原因。利用数值模拟技术,对一个采用垂直定向凝固工艺的钢锭进行了铸造过程模拟分析,考虑了材料参数和边界条件的非线性特征,以及凝固过程中液态金属的自然对流和溶质扩散,预测了钢锭各部位的凝固时间和硫元素宏观通道偏析的位置和偏析程度,模拟结果与相关文献的实验结果基本一致。模拟结果表明,为保证钢锭质量,应从优化钢锭结构和铸造工艺两方面入手,达到减轻宏观偏析、提高钢锭利用率的目的。
The redistribution of solutes during steel solidification induces macrosegregation ultimately. The numerical simulation technology was utilized to predict the position and degree of macrogregation quantitatively. The vertical directional solidification process of steel ingot was simulated considering the ingot structure and casting material properties, the initial condition and boundary conditions and natural convection of liquid metal and solute diffusion during solidification. The simulation results were very close to the experiments＇. The simulation indicates adopting some measurements on ingot structure and casting process can avoid macrosegregation defects and improve the utilization rate of steel ingot.
出处
《热加工工艺》
CSCD
北大核心
2008年第1期70-72,78,共4页
Hot Working Technology
关键词
钢锭
宏观偏析
数值模拟
定向凝固
steel ingot
macrosegregation
numerical simulation
directional solidification
