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Creep behavior of INCOLOY alloy 617

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Abstract

The microstructural features of INCOLOY alloy 617 in the solution annealed condition and after long-term creep tests at 700 and 800 °C were characterized and correlated with hardness and creep strength. Major precipitates included (Cr,Mo,Fe)23C6 carbides and the δ-Ni3Mo phase. M6C and MC carbides were also detected within the austenitic grains. However, minor precipitates particularly γ′-Ni3(Al,Ti) was found to play an important role. At different exposure temperatures, the microstructural features of the Ni–22Cr–12Co–9Mo alloy changed compared with the as-received condition. The presence of discontinuously precipitated (Cr,Mo,Fe)23C6 carbides and their coarsening until the formation of an intergranular film morphology could be responsible both for a reduction in rupture strength and for enhanced intergranular embrittlement. The fraction and morphology of the γ′-phase, precipitated during exposure to high temperature, also changed after 700 or 800 °C exposure. At the latter test temperature, a lower volume fraction of coarsened and more cubic γ′ precipitates were observed. These microstructural modifications, together with the presence of the δ-phase, detected only in specimens exposed to 700 °C, were clearly responsible for the substantially good creep response observed at 700 °C, compared with that found at 800 °C.

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Acknowledgements

The authors are grateful to the other Italian creep laboratories, which contributed to the experimental creep test program (CESI (Piacenza, Milan), ISB (Milan) and CSM (Rome)). Thanks are also due to all the members of the WG3C of ECCC for their support and stimulating discussion.

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Authors and Affiliations

  1. Dipartimento di Meccanica, Università Politecnica delle Marche, Via Brecce Bianche, Ancona, 60131, Italy

    Marcello Cabibbo & Stefano Spigarelli

  2. Dipartimento di Meccanica, Politecnico di Milano, Via La Masa 34, Milano, Italy

    Elisabetta Gariboldi & Dario Ripamonti

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  1. Marcello Cabibbo
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  2. Elisabetta Gariboldi
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  3. Stefano Spigarelli
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  4. Dario Ripamonti
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Correspondence to Marcello Cabibbo.

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Cabibbo, M., Gariboldi, E., Spigarelli, S. et al. Creep behavior of INCOLOY alloy 617. J Mater Sci 43, 2912–2921 (2008). https://doi.org/10.1007/s10853-007-1803-7

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  • DOI: https://doi.org/10.1007/s10853-007-1803-7

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