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Effect of Ti content on creep properties of Ni-base single crystal superalloys

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Abstract

The effect of Ti content on the creep properties and microstructures of experimental Ni-base single crystal superalloys has been investigated. The experimental alloys were designed to provide better high temperature properties than the commercial single crystal alloy CMSX-4. The creep properties of the experimental alloys, Alloy 2 and Alloy 3, were superior to those of CMSX-4. Alloy 3 showed a longer creep life than Alloy 2 at 900 °C and 950 °C, while it has similar creep life with Alloy 2 at 982 °C. Transmission electron microscopy micrographs of the experimental alloys after the creep test showed distinct deformation features as a function of temperature and Ti content. The dissociation of dislocations into partial dislocations with stacking faults in Alloy 3 was found to improve resistance to creep deformation at 950 °C. The effect of Ti on the creep deformation mechanism was not evident at 982 °C, which resulted in similar creep properties in both experimental alloys. The transition of the γ′ cutting mechanism from dislocations coupled with stacking faults to anti-phase boundary coupled pairs occurred both in Alloy 2 and Alloy 3. However, the transition temperature was higher in Alloy 3 than in Alloy 2 because of the difference in Ti contents.

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Authors and Affiliations

  1. High Temperature Materials Department, Korea Institute of Materials Science, Changwon, 51508, Republic of Korea

    Baig Gyu Choi, In Soo Kim, Jeonghyeon Do, Joong Eun Jung & Chang Yong Jo

  2. Department of Materials Science and Engineering, Changwon National University, Changwon, 51140, Republic of Korea

    Hyun Uk Hong

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  1. Baig Gyu Choi
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  2. In Soo Kim
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  3. Hyun Uk Hong
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  4. Jeonghyeon Do
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  5. Joong Eun Jung
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  6. Chang Yong Jo
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Correspondence to Baig Gyu Choi.

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Choi, B.G., Kim, I.S., Hong, H.U. et al. Effect of Ti content on creep properties of Ni-base single crystal superalloys. Met. Mater. Int. 23, 877–883 (2017). https://doi.org/10.1007/s12540-017-7089-7

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  • DOI: https://doi.org/10.1007/s12540-017-7089-7

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