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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    Special 1    November 2007

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Effect of temperature on oxidation behavior of
ternary Fe-15Cu-5Al alloy in pure oxygen
XIANG Jun-huai(向军淮)1, 2, ZHAO Qiong(赵  琼)2, ZHANG Wen-hua(张文华)2

1. Jiangxi Key Laboratory of Surface Engineering, Jiangxi Science and Technology Normal University,
Nanchang 330013, China;
2. School of Materials Science and Engineering, Jiangxi Science and Technology Normal University,
Nanchang 330013, China;

Abstract:The effect of temperature on oxidation behavior of ternary Fe-15Cu-5Al (mole fraction, %) alloy in pure oxygen was studied.  Fe-15Cu-5Al alloy presents an irregular high-temperature oxidation behavior between 700−1 000 ℃, though the kinetic curve at each temperature can be approximately considered as being composed of two quasi-parabolic stages. At 700 ℃ the alloy forms bulky stratified scales. On the contrary, at 800 ℃ the alloy forms an external protective Al2O3 layer. The trend of decrease of oxidation rate does not continue at elevated temperatures. Due to the high stress-growth effect at 900 ℃, the thin Al2O3 layer cannot completely prevent further oxidation of the alloy underneath. When the temperature rises to 1 000 ℃, the high stress-growth effect is more obvious and the alloy forms overgrown large nodules. Compared with the Fe-10Al binary alloy, the presence of 15 % Cu tends to greatly increase the flaw of the formed Al2O3 layer at elevated temperatures, resulting in a peculiar oxidation pattern of Fe-15Cu-5Al alloy.

 

Key words: Fe-15Cu-5Al; oxidation behavior; stress-growth

ISSN 1672-7029
CN 43-1423/U

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