摘要
基于元胞自动机CA的形核和长大模型与宏观传热模型相耦合对双辊连续铸轧纯铝薄带凝固微观组织进行了模拟,模拟计算中采用连续性异质形核模型和修正的枝晶尖端生长动力学模型(KGT)。另外,模拟研究了铸轧工艺参数和金属凝固参数对双辊连续铸轧纯铝薄带凝固微观组织的影响规律。模拟结果可很好地解释和预测啮合点前柱状晶和等轴晶之间的转化和晶粒尺寸大小,柱状晶主要分布在靠近铸轧辊面附近,等轴晶则是远离铸轧辊面而靠近薄带的中心区域。
Nucleation and growth model based on Cellular Automation （CA） incorporated with macro heat transfer calculation was pres- ented to simulate the solidification microstructure of aluminum twin-roll continuous casting, and the nucleation model based on the normal distribution was used in the calculation and the dynamics model of dendrite tip （ KGT model） was amended in view of characteristics of aluminum twin-roll continuous casting. Moreover, the effect of different casting process parameters and solidification parameters on the formation of the microstructures was simulated. The results are helpful to explain the dendrite segregation and size segregation, columnar grains mainly distribute near the casting roller while equiaxed grains distributed far away from the casting roller in front of nip point.
出处
《航空材料学报》
EI
CAS
CSCD
北大核心
2012年第4期1-7,共7页
Journal of Aeronautical Materials
基金
国家自然科学联合基金(u0837601)
国家自然科学基金(50874054)
云南省创新团队(2009CI003)
云南省自然科学基金(2008CD087)
关键词
双辊连续铸轧
铝凝固微观组织
元胞自动机
数值模拟
twin-roll continuous casting
aluminum solidification microstructure
cellular automation
numerical simulation
