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Creep-fatigue crack growth behavior in GH4169 superalloy

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Abstract

This study aims to examine the crack growth behavior of turbine disc GH4169 superalloy under creep-fatigue loading. Crack growth experiments were performed on compact tension specimens using trapezoidal waveform with dwell time at the maximum load at 650 °C. The crack growth rate of GH4169 superalloy significantly increased with dwell time. The grain boundaries oxidize during the dwell process, thereby inducing an intergranular creep-fatigue fracture mode. In addition, testing data under the same dwell time showed scattering at the crack growth rate. Consequently, a modified model based on the Saxena equation was proposed by introducing a distribution factor for the crack growth rate. Microstructural observation confirmed that the small grain size and high volume fraction of the δ phase led to a fast creep-fatigue crack growth rate at 650 °C, thus indicating that two factors, namely, fine grain and presence of the δ phase at the grain boundary, increased the amount of weakened interface at high temperature, in which intergranular cracks may form and propagate.

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Acknowledgements

We are grateful for the financial support from the National Natural Science Foundation of China (Grant Nos. 51675024, 51305012, and 51375031).

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Authors and Affiliations

  1. School of Energy and Power Engineering, Beihang University, Beijing, 100191, China

    Dianyin Hu, Xiyuan Wang, Jianxing Mao & Rongqiao Wang

  2. Collaborative Innovation Center of Advanced Aero-Engine, Beijing, 100191, China

    Dianyin Hu & Rongqiao Wang

  3. Beijing Key Laboratory of Aero-Engine Structure and Strength, Beijing, 100191, China

    Dianyin Hu & Rongqiao Wang

Authors
  1. Dianyin Hu
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  2. Xiyuan Wang
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  3. Jianxing Mao
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  4. Rongqiao Wang
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Correspondence to Dianyin Hu or Rongqiao Wang.

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Hu, D., Wang, X., Mao, J. et al. Creep-fatigue crack growth behavior in GH4169 superalloy. Front. Mech. Eng. 14, 369–376 (2019). https://doi.org/10.1007/s11465-018-0489-7

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  • DOI: https://doi.org/10.1007/s11465-018-0489-7

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