摘要
优化了元胞自动机-有限元法(CAFE)模拟球墨铸铁晶粒组织的参数系统。基于前期大量试验结果,对共晶晶粒的面形核参数和体形核参数进行了优化,并利用优化后的参数对不同碳、硅质量分数的球墨铸铁螺旋试样的流长和流股尖端的凝固组织进行了模拟。在验证试验中,针对难以观测到的球铁共晶晶粒,采用构网算法实现了晶界建模,分别将得到的螺旋试样流长、Voronoi晶粒分布图与模拟结果进行对比。结果表明:在对亚共晶球铁试样进行增碳或增硅处理后,螺旋试样流股末端的晶粒得到了细化,试样流动性得到了提高。此外,模拟结果与试验验证结果的吻合度较高,证明可通过数值模拟评价试样的流动性。
The parameter system of the Cellular Automata Finite Element method(CAFE)for simulating ductile iron grain structure was optimized.Based on a large number of preliminary experiments,the surface nucleation parameters and the nucleus parameters of the eutectic grains were optimized.The flow length of the spheroidal graphite spiral samples with various carbon and silicon contents and the solidification structure at the tip of the stream were simulated.In the verification test,the grain boundary model was realized by the constitutive algorithm for the inconspicuous ductile iron eutectic grains.The flow length of the obtained spiral sample and Voronoi grain distribution map were compared with the simulation results.It was shown that after the carbonization or silicon enhancement treatment,the crystal grains at the end of the spiral sample stream were refined in the hypoeutectic ductile iron sample,and the fluidity of the sample was improved.Moreover,the simulation results are in good agreement with the experimental verification results,and the method for evaluating the fluidity by numerical simulation is established.
作者
王金国
黄恺
闫瑞芳
任帅
王志强
郭劲
WANG Jin-guo;HUANG Kai;YAN Rui-fang;REN Shuai;WANG Zhi-qiang;GUO Jin(Key Laboratory of Automotive Materials Ministry of Education,Jilin University,Changchun 130022,China;College of Materials Science and Engineering,Jilin University,Changchun 130022,China)
出处
《吉林大学学报（工学版）》
EI
CAS
CSCD
北大核心
2021年第3期855-865,共11页
Journal of Jilin University:Engineering and Technology Edition
基金
国家自然科学基金项目(51571101)。
关键词
金属材料
亚共晶球墨铸铁
元胞自动机-有限元法
碳当量元素
合金流动性
构网算法
晶粒细化
metal material
hypoeutectic ductile iron
cellular automata finite element method(CAFE)method
carbon equivalent element
alloy fluidity
network algorithm
grain refinement
