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Microstructure and yield strength of UDIMET 720LI alloyed with Co-16.9 Wt Pct Ti

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Abstract

We proposed a new method for developing Ni-base turbine disc alloy for application at temperatures above 700 °C by mixing a Ni-base superalloy U720LI with a two-phase alloy Co-16.9 wt pct Ti in various contents. The microstructure and phase stability of the alloys were analyzed using an optical microscope, a scanning electron microscope, energy-dispersive spectroscopy, and an X-ray diffractometer. The yield strength was studied by compression tests at temperatures ranging from 25 °C to 1200 °C. The results show that all the alloys had a dendritic structure. Ni3Ti (η) phase was formed in the interdendritic region in the alloys with the addition of Co-16.9 wt pct Ti, and its volume fraction increased with the increase in the addition of Co-16.9 wt pct Ti. The results of exposure at 750 °C show that the addition of Co-16.9 wt pct Ti to U720LI had a great effect on suppressing the formation of σ phase due to the reduced Cr content in the γ matrix. Compared to U720LI, the alloys with the addition of Co-16.9 wt pct Ti possessed higher yield strength. The solid-solution strengthening of γ and γ′ and higher volume fraction of γ′ were assumed to cause this strength increase.

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Authors and Affiliations

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

    Chuanyong Gui (Research Fellow), Akihiro Sato (Research Fellow), Yuefeng Gu (Fenior Researcher) & Hiroshi Harada (Group Leader)

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  1. Chuanyong Gui
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  2. Akihiro Sato
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  3. Yuefeng Gu
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  4. Hiroshi Harada
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Gui, C., Sato, A., Gu, Y. et al. Microstructure and yield strength of UDIMET 720LI alloyed with Co-16.9 Wt Pct Ti. Metall Mater Trans A 36, 2921–2927 (2005). https://doi.org/10.1007/s11661-005-0065-8

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  • DOI: https://doi.org/10.1007/s11661-005-0065-8

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