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Oxidation behavior of an Fe-38Ni-13Co-4.7Nb-1.5Ti-0.4Si superalloy at high temperature in Ar-H2O atmospheres

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Abstract

The oxidation of an Fe-38Ni-13Co-4.7Nb-1.5Ti-0.4Si superalloy (Incoloy 909 type alloy), was investigated at temperatures between 1000 K and 1400 K in Ar-(1, 10%)H20 atmosphere using metallographic, electron probe microanalysis, and X-ray diffraction techniques. The oxide scales consist of an external scale and an internal scale which has an intergranular scale (above 1200 K) and an intergranular scale. The oxide phases in each scale are identified asα-Fe2,O3 (below 1200 K) or FeO (above 1300 K) and CoO · Fe2O3 and FeO · Nb2O5, respectively. The morphologies, the oxide phases and the oxidation rates do not depend on the partial pressure of H2O in the range between one and ten percent in Ar gas. The rate constants for the intergranular-scale formation in this alloy are about one-tenth as large as those in Fe-36%Ni alloy reported previously. At all the temperatures the scales grow according to a parabolic rate law and the apparent activation energies for the processes are estimated.

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Authors and Affiliations

  1. Toyama University, 930, Gofuku, Toyama, Japan

    K. Kusabiraki, T. Nishimoto & T. Ooka

  2. Toyama Fujitsu Ltd., 939-23, Honai, Yatsuomachi, Japan

    J. Ikegami

Authors
  1. K. Kusabiraki
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  2. J. Ikegami
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  3. T. Nishimoto
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  4. T. Ooka
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Kusabiraki, K., Ikegami, J., Nishimoto, T. et al. Oxidation behavior of an Fe-38Ni-13Co-4.7Nb-1.5Ti-0.4Si superalloy at high temperature in Ar-H2O atmospheres. Oxid Met 47, 411–426 (1997). https://doi.org/10.1007/BF02134784

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  • DOI: https://doi.org/10.1007/BF02134784

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