基于计算机仿真的Pb-Sn合金侧向凝固过程A偏析行为分析  

A Segregation Behavior Analysis in Side Solidification Process of Pb-Sn Alloy Based on Computer Simulation

作　　者：邢培振 廉东方 

机构地区：[1]河南水利与环境职业学院,河南郑州450011

出　　处：《铸造技术》2015年第6期1522-1524,共3页Foundry Technology

基　　金：河南省教育厅教学改革项目资助(豫教【2010】07999);河南省教育厅专业人才培养方案与课程体系改革实践课题阶段性成果资助项目(豫教【2012】00819)

摘　　要：根据热溶质在凝固过程中传输原理,通过计算机建立A偏析成形过程的数值模型,得到温度场和浓度场与固相分值的耦合关系;再利用计算机进行数值模拟计算A偏析在合金溶液凝固成形的演化过程,并且分析研究了A偏析的成形位置及其变形程度受浮力数值的影响。结果表明,侧向凝固过程中,溶质浓度与温度的变化均对流体密度产生影响,且该影响因素互相抑制。当膨胀系数α或浮力比F较小时,在凝固侧较近区形成A偏析;随着膨胀系数α或浮力比F的增大,A偏析向凝固中心处移动,偏析程度较小,可提高铸件的力学性能与使用性能。According to the transfer principle of thermal solute in the solidification process, the numerical model of A segregation forming process was established through computer simulation, the coupling relationship of temperature field and concentration field with solid phase fraction was obtained. The alloy solution solidification evolution process of A segregation was simulated, and the effects of buoyancy numerical on forming position and deformation degree were analyzed. The results show that the changing both solute concentration and temperature have effect on fluid density in lateral solidification process, and the influence factors to restrain each other. When the expansion coefficient α or buoyancy ratio F is lesser, A segregation was formed close to the solidification side area. With the increase of expansion coefficient αor buoyancy ratio F, A segregation move to the center of solidification area, and the segregation degree is small. This improves the mechanical properties and the using performances of castings.

关 键 词：计算机仿真 A偏析 凝固 浮力数值 

分 类 号：TG291[金属学及工艺—铸造] TP391.9[自动化与计算机技术—计算机应用技术]