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Correlation of microstructure and creep stages in the 〈100〉 oriented superalloy SRR 99 at 1253 K

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Abstract

The microstructure of creep specimens tested at 1253 K is analyzed in the three stages of the creep curve by TEM investigations. Stage I is characterized by the glide of screw dislocations in the matrix, while the transition to stage II is the beginning of γ′ rafting. Throughout stage II, the γ′ phase is not cut by dislocations. From these and other metallographic results, the mechanism of creep in the single-crystal alloy can be deduced. The misfit stress at the γ/γ′ interfaces proved to be of special importance for this type of alloy containing a high volume fraction of γ′.

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Authors and Affiliations

  1. Institut für Metallforschung, Technische Universität Berlin, BH 18, Strasse des 17. Juni 135, D 1, Berlin 12, Germany

    Monika Feller-Kniepmeier (Professor) & Thomas Link (Research Assistant)

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  1. Monika Feller-Kniepmeier
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Feller-Kniepmeier, M., Link, T. Correlation of microstructure and creep stages in the 〈100〉 oriented superalloy SRR 99 at 1253 K. Metall Trans A 20, 1233–1238 (1989). https://doi.org/10.1007/BF02647405

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  • DOI: https://doi.org/10.1007/BF02647405

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