Tracking inclusions in aluminium alloy castings using positron emission particle tracking (PEPT)
Tracking inclusions in aluminium alloy castings using positron emission particle tracking (PEPT)
复制标题
使用正电子发射粒子追踪 (PEPT) 追踪铝合金铸件中的夹杂物
DOI：
10.1179/174328409x405643
复制
发表时间：
2010
影响因子：
1.8
通讯作者：
M. Hausard
中科院分区：
文献类型：
--
作者：
William D. Griffiths;David Parker;Xiangfeng Fan;M. Hausard
铸件中的夹杂物会导致疲劳裂纹的产生，并损害其机械性能。铸造过程的计算机模拟包括夹杂物运动模型，但目前还没有通过实验验证这些模型的方法。这里描述的技术使用正电子发射粒子跟踪（PEPT）来跟踪填充模具时液态铝合金中夹带的放射性氧化铝粒子的运动，从而显示铸件中夹杂物的行为。使用两种不同的氧化铝颗粒尺寸进行了五次实验，将其插入树脂砂模制成的简单铸造板中。除了证明实验技术的价值外，这些实验还表明铸件中的夹杂物运动如何受到充模过程中流体流动的随机性质的极大影响。
Inclusions in castings lead to the initiation of fatigue cracks and are detrimental to their mechanical properties. Computer simulations of the casting process include models of inclusion movement but there is currently no method of experimentally verifying these models. The technique described here used positron emission particle tracking (PEPT) to follow the movement of radioactive alumina particles entrained in a liquid aluminium alloy as the mould was filled, thus showing the behaviour of inclusions in castings. Five experiments were carried out with two different alumina particle sizes, inserted into a simple cast plate made in resin bonded sand moulds. Besides demonstrating the value of the experimental technique, these experiments showed how inclusion movement in castings was greatly affected by the random nature of the fluid flow during mould filling.