摘要
基于KKS模型,采用相场和溶质场两场耦合的方法,对Fe-0.5%C-0.02%P(摩尔分数)合金凝固过程枝晶生长进行了数值模拟。研究了不同过冷度和各向异性系数对枝晶生长的影响。结果表明,在过冷度较大的时候,枝晶生长的各向异性表现的并不明显;当过冷度较小时,各项异性体现的很明显;在没有加扰动的情况下,当过冷度足够小时,会出现二次枝晶,并伴随着重熔脱落等现象;当各向异性系数足够大时,也会出现二次枝晶和二次枝晶的脱落现象。
The phase-field model coupled with the concentration field was used to simulate microstructural dendrite growth of the alloy Fe-0.5%C-0.02%P （mole fraction）. The influence of different temperature and anisotropy coefficients on dendrite growth was studied.The results show the anisotropy of dendrite growth is unconspicuous when the supercooling degree is big; when the supercooling degree is small, the anisotropy is conspicuous. When the supercooling degree is small enough, the side-branches are of upgrowth and the side-branch will broken off. This phenomenon will appear too, when the anisotropy coefficient is big enough.
出处
《热加工工艺》
CSCD
北大核心
2007年第5期78-81,共4页
Hot Working Technology
基金
甘肃省重大科技成果转化基金资助项目(2GS044A52-001-25)
关键词
相场法
模拟
等温凝固
KKS
phase-field method
simulation
isothermal solidification
KKS
