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Low-cycle fatigue behavior of a directionally solidified Ni-based superalloy subjected to gas hot corrosion pre-exposure

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Abstract

The influence of gas high-temperature hot corrosion (HTHC) pre-exposure on low-cycle fatigue (LCF) behavior was characterized for the directionally solidified (DS) Ni-based superalloy DZ125. Fatigue tests were carried out at 850 °C in the pre-exposed and unexposed specimens for 2, 15 and 25 h. Experimental results show that the porous corrosion scale and γ′-depleted layer formed in gas hot corrosion condition alter the crack initiation mechanisms of the superalloy. Fatigue cracks of the pre-exposed specimens originate from multiple surface locations where spalling of the corrosion products occur, while nucleation of unexposed specimen begins in the defects close to the surface. There is a significant reduction in LCF behavior for pre-exposed specimens in comparison with unexposed specimens.

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Acknowledgements

This study was financially supported by the National Natural Science Foundation of China (No. 51571010) and the National Basic Research Program of China (No. 2015CB057400).

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Authors and Affiliations

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

    Hong-Yu Qi, Ji-Shen Yang, Xiao-Guang Yang & Shao-Lin Li

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

    Hong-Yu Qi & Xiao-Guang Yang

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  1. Hong-Yu Qi
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  2. Ji-Shen Yang
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  3. Xiao-Guang Yang
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Correspondence to Xiao-Guang Yang.

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Qi, HY., Yang, JS., Yang, XG. et al. Low-cycle fatigue behavior of a directionally solidified Ni-based superalloy subjected to gas hot corrosion pre-exposure. Rare Met. 38, 227–232 (2019). https://doi.org/10.1007/s12598-016-0862-9

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  • DOI: https://doi.org/10.1007/s12598-016-0862-9

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