亚共晶Al-7Si-0.6Mg合金凝固过程变形规律研究

发布时间：2018-06-23 16:34

本文选题：Al-Si-.Mg合金 + 凝固变形　；参考：《铸造》2017年11期

【摘要】：本研究以一维长杆铸件为对象,采用K型热电偶与数据分析软件研究了亚共晶Al-7Si-0.6Mg合金的凝固变形规律。结果表明:固定体积下,随着铸件模数与长宽比的增加,初晶析出温度与二元共晶反应温度随之上升,第一冷却速度、第二冷却速度与整体凝固冷却速度连续下降;受铸件/铸型界面换热影响,起始凝固部位体积收缩产生气隙并沿边线逐渐向心部区域扩展,凝固温差诱发产生的热应力受铸型刚性约束作用,铸件产生挠曲变形,宽度方向凝固尺寸变形量符合Lorentz数学函数分布,且随铸件长宽比降低逐渐下降,高度方向符合Extreme数学函数分布,随铸件长度增加连续上升;凝固总尺寸变形量随着铸件模数、凝固枝晶搭接温度与时间的增加而连续上升,随着凝固冷却速度与二元共晶反应温度的增加而不断降低。
[Abstract]:The solidification deformation of hypereutectic Al-7Si-0.6mg alloy was studied by using K-type thermocouple and data analysis software. The results show that with the increase of casting modulus and aspect ratio, the initial crystallization temperature and the binary eutectic reaction temperature increase, the first cooling rate, the second cooling rate and the overall solidification cooling rate decrease continuously. Under the influence of the heat transfer between casting and mold interface, the volume shrinkage of the initial solidification site produces air gap and extends gradually to the center area along the side line. The thermal stress induced by the solidification temperature difference is constrained by the rigidity of the casting mold, and the casting produces flexural deformation. The deformation of solidification dimension in width direction accords with Lorentz mathematical function distribution, and decreases gradually with the decrease of aspect ratio of castings, and the height direction accords with extreme mathematical function distribution, and increases continuously with the increase of casting length, and the total solidification dimension deformation quantity increases with casting modulus. With the increase of solidification dendrite lap temperature and time, the increase of solidification cooling rate and binary eutectic reaction temperature decreased.
【作者单位】：中国航空工业集团公司北京航空材料研究院;北京市先进铝合金材料及应用工程技术研究中心;
【分类号】：TG146.21

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