相场法模拟对流对枝晶生长的影响  

Phase-field Method Simulation of Convection on Dendritic Growth

作　　者：王怀志[1] 张殿喜 王智平[1] 冯力[1] 朱昌盛[1] 肖荣振[1] 

机构地区：[1]兰州理工大学甘肃省有色金属新材料重点实验室,甘肃兰州730050 [2]都匀贵航东方机床厂有限公司,贵州都匀558004

出　　处：《铸造技术》2010年第6期748-752,共5页Foundry Technology

基　　金：国家自然基金(50804019);教育部博士点基金(20070731001)

摘　　要：基于Tong相场模型发展得到的单相场控制多晶粒相场模型,采用相场、流场及温度场三场耦合的方法,对纯镍凝固过程中的枝晶生长进行了数值模拟。对比研究了有无对流情况下,单个枝晶不同择优取向的枝晶形貌和枝晶尖端生长速度;模拟了多个晶粒的竞争生长,再现了凝固过程中的枝晶生长过程。Based on the phase-field model coupling of flow and temperature and phase field proposed by Tong, the model which consists of a single-phase control of polycrystalline of dendrite growth was developed. The studies on dendrite growth in solidification process by the numerical simulation using pure nickel metal were preformed. Comparative studies of single dendrite morphology at the preferred growth orientation with or without convection cases and the tip growth speeds were carried out. The simulation result showed the competitive growth of polycrystalline dendrite, and reviewed the process of dendrite growth in practical solidification.

关 键 词：相场法 对流 枝晶生长 择优取向 

分 类 号：TG111.4[金属学及工艺—物理冶金]