Design of next generation Ni-base single crystal superalloys containing Ir

Towards 1150 °c temperature capability

T. Yokokawa, H. Harada, Y. Mori, K. Kawagishi, Y. Koizumi, T. Kobayashi, M. Yuyama, Shinsuke Suzuki

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    4 Citations (Scopus)

    Abstract

    Ni-base single crystal (SC) superalloys with superior mechanical properties are being developed to improve thermal efficiency of jet engines and land-based gas turbines. The benefit of Ir addition to Ni-base SC superalloys and possibilities to design next generation Ni-base SC superalloys containing Ir were investigated in this study. Five equations that predict the tensile creep rupture life at test conditions of 800°C and 735 MPa, 900 °C and 392 MPa, 1000°C and 245 MPa, 1100°C and 137 MPa and 1150°C and 137 MPa were obtained for Ni-base SC alloys, including Ir containing compositions, with excellent multi-correlation coefficients that range from 0.95 to 0.98. From the regression coefficients of these prediction equations, we successfully clarified the predominating creep strengthening factors in middle - higher temperature and middle - lower stress creep test regions. Additions of Ir were not found to improve the creep strength of alloys, but were effective in suppressing the formation of topologically close packed (TCP) phases. The development of next-generation SC superalloys containing Ir with excellent creep strength was possible by using an updated alloy design program at the National Institute for Materials Science (NIMS). The developed alloy shows an improvement in temperature capability of 20°C in terms of creep rupture life over that of sixth-generation Ni-base SC superalloy TMS-238.

    Original languageEnglish
    Title of host publicationSUPERALLOYS 2016 - Proceedings of the 13th International Symposium on Superalloys
    PublisherMinerals, Metals and Materials Society
    Pages123-130
    Number of pages8
    Volume2016-January
    ISBN (Electronic)9781118996669
    Publication statusPublished - 2016
    Event13th International Symposium on Superalloys, SUPERALLOYS 2016 - Seven Springs, United States
    Duration: 2016 Sep 112016 Sep 15

    Other

    Other13th International Symposium on Superalloys, SUPERALLOYS 2016
    CountryUnited States
    CitySeven Springs
    Period16/9/1116/9/15

    Fingerprint

    heat resistant alloys
    Superalloys
    Creep
    Single crystals
    single crystals
    creep strength
    Temperature
    temperature
    tensile creep
    regression coefficients
    jet engines
    creep tests
    thermodynamic efficiency
    Jet engines
    gas turbines
    Materials science
    materials science
    correlation coefficients
    Gas turbines
    mechanical properties

    Keywords

    • Alloy design
    • Creep
    • Ir addition
    • Single crystal

    ASJC Scopus subject areas

    • Materials Science(all)
    • Condensed Matter Physics

    Cite this

    Yokokawa, T., Harada, H., Mori, Y., Kawagishi, K., Koizumi, Y., Kobayashi, T., ... Suzuki, S. (2016). Design of next generation Ni-base single crystal superalloys containing Ir: Towards 1150 °c temperature capability. In SUPERALLOYS 2016 - Proceedings of the 13th International Symposium on Superalloys (Vol. 2016-January, pp. 123-130). Minerals, Metals and Materials Society.

    Design of next generation Ni-base single crystal superalloys containing Ir : Towards 1150 °c temperature capability. / Yokokawa, T.; Harada, H.; Mori, Y.; Kawagishi, K.; Koizumi, Y.; Kobayashi, T.; Yuyama, M.; Suzuki, Shinsuke.

    SUPERALLOYS 2016 - Proceedings of the 13th International Symposium on Superalloys. Vol. 2016-January Minerals, Metals and Materials Society, 2016. p. 123-130.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Yokokawa, T, Harada, H, Mori, Y, Kawagishi, K, Koizumi, Y, Kobayashi, T, Yuyama, M & Suzuki, S 2016, Design of next generation Ni-base single crystal superalloys containing Ir: Towards 1150 °c temperature capability. in SUPERALLOYS 2016 - Proceedings of the 13th International Symposium on Superalloys. vol. 2016-January, Minerals, Metals and Materials Society, pp. 123-130, 13th International Symposium on Superalloys, SUPERALLOYS 2016, Seven Springs, United States, 16/9/11.
    Yokokawa T, Harada H, Mori Y, Kawagishi K, Koizumi Y, Kobayashi T et al. Design of next generation Ni-base single crystal superalloys containing Ir: Towards 1150 °c temperature capability. In SUPERALLOYS 2016 - Proceedings of the 13th International Symposium on Superalloys. Vol. 2016-January. Minerals, Metals and Materials Society. 2016. p. 123-130
    Yokokawa, T. ; Harada, H. ; Mori, Y. ; Kawagishi, K. ; Koizumi, Y. ; Kobayashi, T. ; Yuyama, M. ; Suzuki, Shinsuke. / Design of next generation Ni-base single crystal superalloys containing Ir : Towards 1150 °c temperature capability. SUPERALLOYS 2016 - Proceedings of the 13th International Symposium on Superalloys. Vol. 2016-January Minerals, Metals and Materials Society, 2016. pp. 123-130
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    AU - Kobayashi, T.

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