Effect of Al content on oxidation behaviour of ternary Fe-Al-C alloys

被引：33
|
作者：
Rao, VS [1 ]
Baligidad, RG
Raja, VS
机构：
[1] Indian Inst Technol, Bombay 400076, Maharashtra, India
[2] Def Met Res Lab, Hyderabad 500058, Andhra Pradesh, India
来源：
INTERMETALLICS | 2002年 / 10卷 / 01期
关键词：
iron aluminides; based on Fe3Al; ternary alloy systems; oxidation; microstructure;
D O I：
10.1016/S0966-9795(01)00106-6
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Iron aluminides produced by the electroslag refining technique, having the compositions: (1) Fe-16Al-1C, (2) Fe-10Al-1C, and (3) Fe-8Al-1C were used to investigate the effect of Al on the oxidation behaviour of the Fe-1C-Al system at 700 to 1000 degreesC. Prior to oxidation studies, phase and microstructure of alloys were analysed. The carbide phase, Fe3AlC0.69, was found to be distributed in the Fe3Al matrix in alloy 1 and alpha (Fe-Al) matrix in alloys 2 and 3. The low Al content alloys displayed inversion in the oxidation kinetics below 800 degreesC, while, high Al content alloy displayed inversion phenomena at 1000 degreesC. The mechanism involving inversion in oxidation kinetics was found to be different in the two cases. In the former, it was attributed to the preferential oxidation of Al, while in the latter, to the phase transformation within the Al2O3. Carbides in the alloy having low Al content showed instability during oxidation. (C) 2002 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：73 / 84
页数：12
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