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Oxidation Behavior of Fine-Grain MA 956 Superalloy

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Abstract

This investigation was undertaken in an attempt to gain a fundamentalunder-standing of the oxidation behavior of a fine-grain MA 956 in thetemperature range 800 to 1200°C, with emphasis placed on the scalemorphology and oxidation kinetics. Oxidation reaction led to the formationof a thin and dense alumina scale, irrespective of the oxidationtemperature. At intermediate temperatures plateletlike oxides of alumina,probably θ-Al2O3, covered the surface, whereas at othertemperatures small nodules of Fe-, Cr-, Ti or Y-rich oxides were observed inthe outer part of the alumina scale. The temperature dependence of theparabolic rate constant revealed a change in the oxidation mechanism with atransition at about 1000°C. The high-temperature mechanism is controlled bythe formation of α-alumina, whereas the low-temperature oxidationmechanism is controlled by formation of metastable alumina. Comparison withthe reported oxidation kinetics for coarse-grain MA 956 is inconclusive,since microstructure (grain size, texture) of the substrate changed duringoxidation in the high-temperature range.

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Authors and Affiliations

  1. Centro Nacional de Investigaciones Metalúrgicas, CENIM (CSIC), Avda. Gregorio del Amo 8, 28040, Madrid, Spain

    M. C. García-Alonso, J. L. González-Carrasco, M. L. Escudero & J. Chao

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  1. M. C. García-Alonso
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  2. J. L. González-Carrasco
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  3. M. L. Escudero
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  4. J. Chao
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García-Alonso, M.C., González-Carrasco, J.L., Escudero, M.L. et al. Oxidation Behavior of Fine-Grain MA 956 Superalloy. Oxidation of Metals 53, 77–98 (2000). https://doi.org/10.1023/A:1004582713929

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