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A New Oxide Morphology Map: Initial Oxidation Behavior of Ni-Base Single-Crystal Superalloys

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Abstract

Predictions for oxidation behavior of Ni-base superalloys become more difficult than before because of the complex alloy composition. In this study, we focus on the initial oxidation behavior of Ni-base superalloys, and we suggest a new diagram to predict the initial oxide morphology of Ni-base superalloys with 63 binary, ternary, and multicomponent Ni-base single-crystal superalloys at 1373 K (1100 °C). As a comparison of observed and calculated weight changes after one cycle at 1373 K (1100 °C) obtained by a regression analysis, 63 alloys demonstrated two distinct behaviors, which are divided heretofore into group A and group B. Microstructural observation revealed that an oxide layer in the group A alloys consists of Al2O3 and/or spinel or complex oxide, whereas an oxide layer in the group B alloys consists of a thick NiO layer with an Al2O3 internal subscale. Thermodynamic properties can reflect more effects of alloy elements in Ni-base superalloys, and Al and Cr activities, calculated by Thermo-Calc, were used as factors to predict initial oxidation morphology. Groups A and B alloys can clearly be divided according to Al and Cr activities. This was suggested as a new diagram to predict the initial oxide morphology of Ni-base superalloys, and possibly it can apply for any generation of Ni-base superalloys.

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Authors and Affiliations

  1. High Temperature Materials Center, National Institute for Materials Science, Ibaragi, 305-0047, Japan

    Aya S. Suzuki (Post Doctoral Researcher), Kyko Kawagishi (Lead Researcher), Tadaharu Yokokawa (Principal Researcher), Hiroshi Harada (Managing Director) & Toshiharu Kobayashi (Principal Researcher)

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  1. Aya S. Suzuki
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  2. Kyko Kawagishi
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  3. Tadaharu Yokokawa
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  4. Hiroshi Harada
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  5. Toshiharu Kobayashi
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Correspondence to Kyko Kawagishi.

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Manuscript submitted February 23, 2011.

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Suzuki, A.S., Kawagishi, K., Yokokawa, T. et al. A New Oxide Morphology Map: Initial Oxidation Behavior of Ni-Base Single-Crystal Superalloys. Metall Mater Trans A 43, 155–162 (2012). https://doi.org/10.1007/s11661-011-0838-1

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  • DOI: https://doi.org/10.1007/s11661-011-0838-1

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