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Effects of scale composition on oxidation kinetics of Fe-based superalloy

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Abstract

By oxidation weight gain method, four groups of Fe-based superalloys with different content of chromium, aluminium and silicon were tested at 1 200 °C for 500 hours. According to the oxidation weight gains, the oxidation kinetic curves were plotted, and the equations were regressed by least square method and non-linear curve fitting. The effects of different scale compositions on the morphology and oxidation kinetic law were studied further by analysis of X-ray diffraction (XRD) and scanning electron microscope (SEM). It is found that the compounded scale is composed of Cr2O3, Al2O3, SiO2 and FeCr2O4, with compact structure and fine grains, possessing complete oxidation resistance at 1 200 °C, and the oxidation kinetic curve follows the power function of y=ax b (a>0, 0<b<1). When the compounded scale lacks Al2O3 or SiO2, it becomes weak in oxidation resistance, but the oxidation kinetic curve still follows the power function with bigger parameter b. When Cr2O3 is absent, the kinetic curve shows two parts: the slow adding of oxidation weight gains at the beginning and the ascending line in the end. Such scale loses oxidation resistance completely.

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Authors and Affiliations

  1. Key Laboratory for Liquid Structure and Heredity of Materials of Education Ministry, School of Materials Science and Engineering, Shandong University, Ji’nan, 250061, China

    Haitao Wang  (王海涛), Huashun Yu  (于化顺), Jing Zhang, Hongmei Chen & Guanghui Min

  2. School of Electrical Engineering, Shandong University, Ji’nan, 250061, China

    Zhichen Wang

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  1. Haitao Wang  (王海涛)
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  2. Huashun Yu  (于化顺)
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  3. Zhichen Wang
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  4. Jing Zhang
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  5. Hongmei Chen
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  6. Guanghui Min
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Correspondence to Huashun Yu  (于化顺).

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Funded by Komatsu Ltd. of Japan (No. 31370011370804, Shandong University), the Friendly Joint Item between Shandong University & Komatsu Ltd.

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Wang, H., Yu, H., Wang, Z. et al. Effects of scale composition on oxidation kinetics of Fe-based superalloy. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 25, 99–103 (2010). https://doi.org/10.1007/s11595-010-1099-3

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  • DOI: https://doi.org/10.1007/s11595-010-1099-3

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