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Microstructural Evolution and Mechanical Properties of a Ni-Based Superalloy, TMW-4

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Abstract

The microstructural evolution and mechanical properties were examined in a Ni-based superalloy, TMW-4, with high Co and Ti contents at temperatures ranging from 700 °C to 1200 °C for various times up to 1000 hours. The results showed that solution treatments (temperatures: from 1100 °C to 1200 °C; time: 4 hours) essentially affected the fraction and size of primary and secondary γ′ precipitations and grain size. No η-Ni3Ti phase was observed in all solution heat-treatment samples. On the other hand, small amounts of η phase were observed in the samples after homogenization at 1220 °C and aging at temperatures ranging from 1000 °C to 1175 °C. Based on the investigations, a time-temperature-transition (TTT) curve for the η-phase formation was constructed. These microstructural effects were successfully combined to obtain an increase of tensile properties in terms of both strength and ductility.

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Notes

  1. Inconel and Ninomic are trademarks of Inco. alloys International, Inc., Huntington, WV.

  2. CMSX is a trademark of Cannon-Muskegon Co., Muskegon, MI

  3. PHILIPS is a trademark of Philips Electronic Instruments Corp., Mahwah, NJ.

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Authors and Affiliations

  1. High Temperature Materials Center, National Institute for Materials Science, Tsukuba, 305-0047, Japan

    C.Y. Cui (Research Fellow), Y.F. Gu (Senior Researcher), D.H. Ping (Senior Researcher) & H. Harada (Senior Researcher)

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  1. C.Y. Cui
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  2. Y.F. Gu
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  3. D.H. Ping
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  4. H. Harada
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Correspondence to C.Y. Cui.

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Manuscript submitted April 1, 2008.

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Cui, C., Gu, Y., Ping, D. et al. Microstructural Evolution and Mechanical Properties of a Ni-Based Superalloy, TMW-4. Metall Mater Trans A 40, 282–291 (2009). https://doi.org/10.1007/s11661-008-9746-4

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