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Phase Equilibria, Microstructure, and High-Temperature Strength of TiC-Added Mo-Si-B Alloys

  • Symposium: Beyond Nickel Base Superalloys II
  • Published:
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Abstract

TiC was added to Mo-Si-B alloys using a conventional Ar arc-melting technique, and the phase equilibria, microstructure evolution, and high-temperature strength at 1673 K (1400 °C) were investigated. The primary phase changed to Mo solid solution (Moss), Mo5SiB2 (T2), or TiC depending on the composition. Following the primary phase solidification, a Moss + TiC, Moss + T2, or Moss + T2 + TiC + Mo2C eutectic reaction took place as the secondary solidification step. In some alloys, Moss + T2 + TiC and Moss + T2 + Mo2C eutectic reactions were present as higher-order solidification steps. After annealing at 2073 K (1800 °C) for 24 hours, Moss, T2, TiC, and Mo2C coexisted stably with microstructural coarsening. The coarsening rate was much faster in an alloy with no TiC dispersion, suggesting that TiC has a strong pinning effect on the grain boundary and interface migration. Compression tests conducted at 1673 K (1400 °C) revealed strength properties of almost all the alloys that were better than those of the Mo-Hf-C alloy (MHC). Alloy densities were 9 g/cm3 or less, which is lighter than pure Mo and MHC (≥10 g/cm3) and competitive with Ni-base superalloys. TiC-added Mo-Si-B alloys are promising candidates for ultrahigh-temperature materials beyond Ni-base superalloys.

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Acknowledgments

This work was supported by the funding program for Next Generation World-Leading Researchers (NEXT Program) (No. GR017) and a Grant-in-Aid for Scientific Research (No. 23-4805) from the Japan Society for the Promotion of Science (JSPS).

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Authors and Affiliations

  1. Graduate School of Environmental Studies, Tohoku University, 6-6-02 Aramaki Aza Aoba, Aobaku, Sendai, Miyagi, 980-8579, Japan

    Shimpei Miyamoto (Graduate Student), Takahiro Kaneko (Graduate Student), Junya Nakamura (Assistant Professor) & Tetsuya Sato (Graduate Student)

  2. IHI Corporation, 5292 Aioi, Aioi, Hyogo, 678-0041, Japan

    Shimpei Miyamoto (Graduate Student)

  3. Graduate School of Engineering, Tohoku University, 6-6-02 Aramaki Aza Aoba, Aoba-ku, Sendai, Miyagi, 980-8579, Japan

    Kyosuke Yoshimi (Professor), Seong-Ho Ha (Post Doctoral Fellow) & Kouichi Maruyama (Professor)

  4. Korea Institute of Industrial Technology, 7-47 Songdo-dong, Yeonsu-ku, Inchon, South Korea

    Seong-Ho Ha (Post Doctoral Fellow)

  5. Central Japan Railway Company, 2-1-85 Konan, Minato-ku, Tokyo, 108-8204, Japan

    Tetsuya Sato (Graduate Student)

  6. Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi, 980-8579, Japan

    Rong Tu (Associate Professor) & Takashi Goto (Professor)

  7. Wuhan University of Technology, 122 Luoshi Road, Wuhan, Hubei, 430070, P.R. China

    Rong Tu (Associate Professor)

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  1. Shimpei Miyamoto
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  2. Kyosuke Yoshimi
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  3. Seong-Ho Ha
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  4. Takahiro Kaneko
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  5. Junya Nakamura
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  6. Tetsuya Sato
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  7. Kouichi Maruyama
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  8. Rong Tu
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  9. Takashi Goto
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Corresponding author

Correspondence to Kyosuke Yoshimi.

Additional information

Manuscript submitted December 21, 2012.

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Miyamoto, S., Yoshimi, K., Ha, SH. et al. Phase Equilibria, Microstructure, and High-Temperature Strength of TiC-Added Mo-Si-B Alloys. Metall Mater Trans A 45, 1112–1123 (2014). https://doi.org/10.1007/s11661-013-1779-7

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  • DOI: https://doi.org/10.1007/s11661-013-1779-7

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