期刊论文

Study on Effect of Supercooling Degree and Nucleation Number on Microstructure of H13 Steel Based on CAFE Model

中文

铸造技术

1000-8365

2016

37

9

1807-1811

10.16410/j.issn1000-8365.2016.09.002

湖南省科技重大专项资助项目(2012FJ1007) 湖南省自然科学省市联合基金资助项目(S2015J512J)

本校为第一机构

基于CA-FE方法对工业H13钢进行凝固过程数值模拟,建立了宏观温度场、浓度场和微观生长过程耦合的凝固组织模拟模型。以元胞自动机模型为基础,耦合有限元模型,在晶粒尺度上模拟了其凝固过程。应用建立的微观组织模型,研究了过冷度、形核数对凝固组织的影响。结果表明,过冷度处于0.1~5℃,晶区主要是中间等轴晶区为主,柱状晶区占有比极小,且生长趋势受到等轴晶的抑制;当过冷度处于5~7℃,柱状晶生长速度增大,占有比增加,但是中间等轴晶内部组织粗化,形状因子增大,晶粒尺寸和晶粒度偏差表现为先增大,后减小;然而,过冷度达到7~15℃,柱状晶生长受到内部等轴晶的抑制,柱状晶占有优势,且随过冷度增加,晶粒...

The solidification process of H13 steel was simulated based on CAFE model. The solidification microstructure simulation model coupled with macro-temperature field, concentration field and micro growth process was established based on cellular automaton model. The effect of supercooling degree and nucleation number on solidification microstructure was investigated using established microstructure model. The results show that when the supercooling degree is 0.1~5 ℃, the grain area is mainly middle zone equiaxed grain, the columnar grain zone occ...