【作者】 杨湘杰； 胡传林； 桂云鹏； 张晓开；

【Author】 YANG Xiang-jie;HU Chuan-lin;GUI Yun-peng;ZHANG Xiao-kai;School of Mechatronics Engineering,Nanchang University;Jiangxi Provincial key laboratory of high performance precision molding;School of Materials Science and Engineering,Nanchang University;

【机构】 南昌大学机电工程学院； 江西省高性能精确成型重点实验室； 南昌大学材料科学与工程学院；

【摘要】 本文建立了一种LB模型,用数值模拟的方法研究了Al-Zn合金预制体在固液混合流变铸造中的熔化和凝固过程。该模型主要模拟Al-15%Zn合金搅拌期间预制体的熔化过程以及熔体内的流场和温度场的演变过程,并分析了该过程中固液混合流变工艺的熔化特点。模拟结果表明:熔体内速度场呈现明显的中心对称分布,随着预制体的搅拌速度场的分布区域逐渐扩大并趋于稳定;在固液界面处会出现因相变潜热而产生的温度波动,在搅拌的过程中,熔体内各个区域温度都将发生变化,最终熔体温度趋于稳定并降至液相线以下,且模拟过程中各区域温度数据都与实验情况相吻合。更多还原

【Abstract】 In this paper, a LB model is created,which is studied the melting and solidification process of the Al-Zn alloy preform in the solid-liquid mixing rheocasting through numerical simulation method. The model mainly simulats the melting process of preform and the flow and temperature field evolution within the melt during the Al-15% Zn alloy stirring process,and then the melt rheological characteristics of the solid-liquid mixing process is analyzed. The simulation results show that the velocity field of the melt is obviously centrosymmetric distribution. As preform stirring, velocity field distribution area expands and stabilizes gradually. Due to latent heat of phase change, the temperature fluctuates in solid-liquid interface. During stirring, the melt temperature of each region will change.Eventually melt temperature tend to stabilization and dropped below the liquid line, and the temperature data in simulation areas is consistent with the experimental situation.更多还原