Creep-fatigue crack growth behavior in GH4169 superalloy

Dianyin HU, Xiyuan WANG, Jianxing MAO, Rongqiao WANG

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Front. Mech. Eng. ›› 2019, Vol. 14 ›› Issue (3) : 369-376. DOI: 10.1007/s11465-018-0489-7
RESEARCH ARTICLE

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 d 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 d phase at the grain boundary, increased the amount of weakened interface at high temperature, in which intergranular cracks may form and propagate.

Keywords

crack growth rate / creep-fatigue / GH4169 superalloy / CT specimen / dwell time

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Dianyin HU, Xiyuan WANG, Jianxing MAO, Rongqiao WANG. Creep-fatigue crack growth behavior in GH4169 superalloy. Front. Mech. Eng., 2019, 14(3): 369‒376 https://doi.org/10.1007/s11465-018-0489-7

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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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2018 Higher Education Press and Springer-Verlag GmbH Germany, part of Springer Nature
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