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Failure Assessment of the First Stage Blade of a Gas Turbine Engine

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Abstract

The gas turbine engine under investigation in this paper was in service after major overhaul for about 2 h at 9:47 A.M. on 18 October, 2014. The 60 MW gas turbine engine experienced a forced break down because of extremely high vibrations and subsequent output power reduction. The blade was made of Inconel 738LC nickel-based super-alloy. Evaluation of the microstructures of the root and tip of the damaged blade, showed no significant change in the microstructure. In closer observation of the fractured blade, some points affected by impact of the remaining airfoil were observed. Metallurgical investigations of the damaged zones of the fractured blade showed many iron rich zones near the fractured surface. The morphology of the fractured surface showed a semi-brittle fracture due to the impact. Finally, it was concluded that the main reason for the gas turbine failure was domestic object damage due to the impact of the liberated components of the turbine engine on the blades.

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Acknowledgements

The authors would like to acknowledge Mr. G.H. Radaei for his contributions to the assimilation of the metallurgical data. Also the help of Mr. M.R. Mohammadi Arhari for his technical data of this study and Mrs. A. Naghibi for the article editorial helps are gratefully acknowledged.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Dezful Branch, IAU, Dezfoul, 64616-45169, Iran

    B. Salehnasab

  2. Department of Materials Science and Engineering, Faculty of Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran

    E. Hajjari

  3. Department of Mechanical Engineering, Ahvaz Branch, IAU, Ahvaz, Iran

    S. A. Mortazavi

Authors
  1. B. Salehnasab
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  2. E. Hajjari
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  3. S. A. Mortazavi
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Correspondence to B. Salehnasab.

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Salehnasab, B., Hajjari, E. & Mortazavi, S.A. Failure Assessment of the First Stage Blade of a Gas Turbine Engine. Trans Indian Inst Met 70, 2103–2110 (2017). https://doi.org/10.1007/s12666-016-1031-4

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  • DOI: https://doi.org/10.1007/s12666-016-1031-4

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