摘要
以温度扩散方程、多组元的溶质扩散方程以及枝晶尖端生长的ＬＧＫ模型为基础，建立了Ｎｉ基耐热合金凝固过程的元胞自动机模型， 利用这个模型模拟了凝固过程中不同冷却速率下晶粒微观结构的演化， 对模基表面与铸件内部的均匀形核、晶粒生长、扩散过程以及固／液界面的曲率等对凝固过程中晶粒微观结构演化的影响分别进行了讨论．
A cellular automatum model is developed to study the solidification process for a Ni-based superalloy, based on the temperature diffusion equation, multi-component solute diffusion equation and LGK model used in the growth ahead of dendritic tips. The model is used in simulating the evolution of grain structures in the solidification process under a selected undercooling rate. The heterogeneous nucleation on the mould surface and in the volume of melt, the grain growth, the diffusion procedure and the solid/liquid interface curvature which affect the evolution of the grains microstructure in solidification are discussed respectively.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2001年第8期882-888,共7页
Acta Metallurgica Sinica
基金
国家自然科学基金G2000067104资助项目
