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Alloy Composition Screening for Ni-Base Turbine Disc Superalloys Using the Creep Property of Single Crystal

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Abstract

This paper proposes a method for alloy composition screening using the creep property of a single crystal (SC) for designing new Ni-base powder metallurgy (P/M) turbine disc superalloys. A commercial Ni-base disc alloy, U720Li®, a Ni-Co-base disc alloy, TMW-4M3, and a Ni-base conventionally cast alloy, TM-47, were selected for investigation. Their SC and P/M samples were prepared such that their γ/γ′ structures were similar. Moreover, tensile creep tests were performed on SC samples, and compressive creep tests were performed on SC and P/M samples. The tensile creep test results of SC samples at 1073 K (800 °C) and 735 MPa indicate that 0.2 and 1 pct creep times, as well as rupture life, are long in the order of TM-47 SC, TMW-4M3 SC, and U720Li SC. These results simulate the intragranular creep resistances of the corresponding P/M alloys. Furthermore, there is no significant difference in 0.2 and 1 pct compressive creep times between the SC and P/M samples of each alloy. Additionally, the 0.2 and 1 pct creep times of tensile and compressive creep tests of every alloy had an identical order. Therefore, alloy composition screening using SC creep property enables the design of new disc alloys with excellent creep resistance.

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Acknowledgments

This study was financially supported by Acquisition, Technology, and Logistics Agency, Japan, under the “Innovative Science and Technology Initiative for Security” project. We appreciate Dr. Toshiharu Kobayashi for his advice on the casting process. We acknowledge Dr. Toru Hara, Ms. Yuka Hara, and Ms. Akiko Nakamura of NIMS for their technical assistance on SEM observation. We also appreciate Dr. Kazumi Minagawa, Mr. Masashi Hirosawa, and Mr. Takuma Kohata for their assistance on powder evaluation and density measurement.

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  1. National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki, 305-0047, Japan

    Yuhi Mori, Kyoko Kawagishi, Toshio Osada, Hiroshi Harada, Michinari Yuyama, Yuji Takata, Makoto Osawa & Ayako Ikeda

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  1. Yuhi Mori
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  2. Kyoko Kawagishi
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Correspondence to Yuhi Mori.

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Manuscript submitted October 11, 2019.

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Mori, Y., Kawagishi, K., Osada, T. et al. Alloy Composition Screening for Ni-Base Turbine Disc Superalloys Using the Creep Property of Single Crystal. Metall Mater Trans A 51, 2035–2043 (2020). https://doi.org/10.1007/s11661-020-05681-9

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  • DOI: https://doi.org/10.1007/s11661-020-05681-9

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