摘要
建立了一个元胞自动机与有限差分的耦合模型,并将其应用于镍基合金TIG焊熔池凝固过程的模拟.首先对焊接熔池内的各种凝固组织的生长进行了模拟,成功地模拟了平面晶、胞状晶、树枝晶、等轴晶的形态,并与试验结果进行了比照.进一步模拟熔池凝固时的凝固组织不同形态的演变过程,再现了胞状晶到树枝晶、树枝晶到等轴晶的转变过程.同时,采用溶质扩散模型模拟了扩散对溶质场分布的影响.结果表明,模拟结果与试验结果吻合良好.
A coupled model of cellular automaton and finite difference was established and applied to solidification process in molten pool of nickel base alloy. The growth of various solidification microstructures,including planar crystal,cellular crystal,columnar dendritic crystal and crystal equiaxed dendritic in molten pool was firstly carried out and contrasted with experiment results. Moreover,variation in solidification mode in molten pool was performed,which represented cellular-to-dendritic and columnar-to-equiaxed transitions. The effect of diffusion on the distribution of solute was also calculated by solute diffusion model. The simulation results were in good accordance with the experiment results.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2010年第7期43-46,共4页
Transactions of The China Welding Institution
基金
国家自然科学基金资助项目(50775112)
关键词
焊缝组织演变
元胞自动机法
溶质偏析
microstructure evolution
cellular automaton
solute segregation
