The effect of water vapor on the oxidation of alloys that develop alumina scales for protection
The effect of water vapor on the oxidation of alloys that develop alumina scales for protection
复制标题
水蒸气对合金氧化的影响，合金会形成氧化铝鳞片以进行保护
DOI：
10.1007/s11661-999-0128-3
复制
发表时间：
1999
期刊：
影响因子：
--
通讯作者：
F. Pettit
中科院分区：
文献类型：
--
作者：
R. Janakiraman;G. H. Meier;F. Pettit
在1100°C的湿空气和干空气中对一些合金和涂层进行了循环氧化试验，这些合金和涂层暴露在氧化条件下会形成α-Al_2O_3垢。所研究的合金包括PWA1480、PWA1484、CMSX4、PWA1480和PWA1484以及Co-24Cr-10.5Al-0.3Y。在干燥空气中氧化铝氧化膜出现一些开裂和剥落的情况下，水蒸气的存在使降解速率增加了2倍。当氧化铝在干燥空气中没有发生开裂或剥落时，就像低硫合金一样，水蒸气对氧化行为没有影响。认为在循环氧化过程中，水蒸气会引起Al_2O_3-合金界面的应力腐蚀开裂。
Cyclic oxidation tests have been performed at 1100 °C in wet and dry air on a number of alloys and coatings that formα-Al2O3scales upon exposure to oxidizing conditions. The alloys that were investigated included PWA 1480, PWA 1484, CMSX 4, diffusion aluminide coatings on PWA 1480 and PWA 1484, and Co-24Cr-10.5Al-0.3Y. In cases where some cracking and spalling of the alumina scales occurred in dry air, the presence of water vapor caused the degradation rate to be increased by a factor of 2. When no cracking or spalling of the alumina occurred in dry air, as was the case for low sulfur alloys, water vapor had no effect on the oxidation behavior. It is proposed that water vapor causes stress corrosion cracking at the Al2O3-alloy interface during cyclic oxidation.