摘要
在有限体积软件FLUENT的基础上建立了包晶合金定向凝固的多场耦合模型,并计算了Sn-Cd包晶合金定向凝固时的温度场、流场、溶质场以及固液界面形态等特征。研究表明,试样直径是决定自然对流强度的主要因素,随着试样直径的增大,固液界面前沿熔体流速增大,径向溶质偏析程度先增强后减弱;抽拉速率增大时,自然对流强度变化较小,固液界面前沿的环流区域减小,溶质径向偏析程度减弱;试样直径越小,抽拉速率越大,试样初始过渡区长度越短。
A multi-field coupling simulating model used for analyz ing the directional solidification process of Sn-Cd peritectic alloy was designed, and the temperature field, flow field, solute field and the shape of Solid/Liquid interface during solidification were calculated then. Research results show that the diameter is the main factor determining the intensity of natural convection, with the increase of the diameter, the velocity in front of S/L interface increases, and the degree of radial segregation will first increase then decrease. When the withdrawal rate increases, the intensity of natural convection changes little and the circulation area in front of the S/L interface becomes bigger, the degree of macro-segregation weakens. The smaller the diameter and the greater the withdrawal rate, the shorter the length of initial transition region is.
出处
《铸造技术》
CAS
北大核心
2014年第10期2171-2175,共5页
Foundry Technology
基金
国家自然科学基金资助项目(50774061)
凝固技术国家重点实验室自主研究课题资助项目(28-TP-2009)
关键词
包晶合金
定向凝固
流场
溶质场
peritectic alloy
directional solidification
flow field
solute field
