氩气雾化Rene'95合金粉末颗粒二次枝晶间距的研究

The Study of Second Dendrite Arm Spacings of Argon-atomised Rene' 95 Alloy Powder

摘要: 本文利用光学显微镜定量金相法测量了氩气雾化Rene’95粉末高温合金粉末颗粒的平均二次枝晶间距,应用牛顿冷却定律得出粉末颗粒的冷却速度,并计算了粉末颗粒完全凝固所需要的时间。在此基础上推导出了Rene’95合金粉末颗粒的二次枝晶间距、颗粒直径以及冷却速度和凝固速度、凝固时间之间的关系。d=0.242D^0.489,d=10.9V^0.488,d=2.47（de/dt）^-0.492,d=39.28tk^0.245。研究结果表明:氩气雾化Rene'95合金粉末颗粒凝固时,满足一般铸造合金时的关系式,即d=av^-n,d=btⁿ,n基本上在1/3～1/2之间。

Abstract: The second dendrite arm spacings were measured by the method of stereolog-ical metallography method. The cooling rate is determined by the Newton's Cooling Law, and the time required for entirely solidification of powder particles is calculated as well. The second dendrite arm space of Rene'95 alloy powder is related with the particle size, cooling rate、solidifying rate and the time needed for solidification. The relationships are represented as d=0.242D0.489, d=102.9v^-0.488, d=2.47 (dε/dt)^-0.492, and d=39.28tk^0.245.
The results of the study made it clear that the commom equations of casting, i, e, d=av^-n, d=btⁿ, where n is between l/3-l/2, can be applied to the olidification process of argon-atomised Rene'95 alloy powder particles.