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| Cyclic and Static Oxidation Behavior of Fe-Cu-Ni-Al Alloy at 900 ℃ |
Bin XIAO1,Junhuai XIANG1,2( ),Honghua ZHANG1,2 |
1 School of Materials and Mechanical & Electrical Engineering, Jiangxi Science and Technology Normal University, Nanchang 330013, China;
2 Jiangxi Key Laboratory of Surface Engineering, Jiangxi Science and Technology Normal University, Nanchang 330013, China |
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Abstract The static and cyclic oxidation behavior of Fe-65Cu-15Ni-5Al and Fe-45Cu-15Ni-5Al alloyshas been investigated in air at 900 ℃ respectively. In the case of static oxidation, the oxidation rate of Fe-65Cu-15Ni-5Al is much lower than that of Fe-45Cu-15Ni-5Al. The oxidation kinetics of Fe-65Cu-15Ni-5Al obeys parabolic law during the first oxidation stage, followed by a linear law, while that of Fe-45Cu-15Ni-5Al obeys parabolic law in the whole oxidation period. However, In the case of cyclic oxidation, Fe-65Cu-15Ni-5Al shows a much faster oxidation rate than Fe-45Cu-15Ni-5Al. For the above two cases, the formed scales are both composed of an outermost thick CuO layer, a middle layer is mainly composed of mixture of oxides of Fe, Ni and Al, together with their compounds. Internal oxidation only occurs for the Fe-65Cu-15Ni-5Al alloy statically oxidized. While in other cases, discontinuous inner layer of Al2O3 is present, which is connected with the internal oxidation region of Al. In the case of cyclic oxidation, the scale of inner Al2O3 layer of Cu-rich Fe-65Cu-15Ni-5Al alloy has undergone rupture easily due to the presence of high stress, resulting in high corrosion rate. On the contrary, in the case of static oxidation at 900 ℃ the critical Al content needed to form a protective outer Al2O3 layer in the α phase has been reached, which can fairly well explain its better oxidation resistant than Fe-45Cu-15Ni-5Al.
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Received: 01 October 2016
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| Fund: Supported by Natural Science Foundation of Jiangxi Province (20132BAB206015 and 20122BAB216018) and Science and Technology Research Youth Fund Project of Jiangxi Provincial Education Department (GJJ150811) |
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