Corrosion-Fatigue Failure of Gas-Turbine Blades in an Oil and Gas Production Plant

Mojtaba Rajabinezhad, Abbas Bahrami, Mohammad Mousavinia, Seyed Jalil Seyedi, Peyman Taheri

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)
139 Downloads (Pure)

Abstract

This paper investigates the root cause of a failure in gas-turbine blades, made of Nimonic-105 nickel-based superalloy. The failure was reported in two blades in the second stage of a turbine-compressor of a gas turbine in the hot section. Two failed blades were broken from the root and from the airfoil. The failure took place after 20 k h of service exposure in the temperature range 700–850 °C, with the rotating speed being in the range 15,000–16,000 rpm. The microstructures of the failed blades were studied using optical/electron microscopes. Energy dispersive X-ray spectroscopy (EDS) was employed for phase identification. Results showed that failure first initiated from the root. The dominant failure mechanism in the root was concluded to be corrosion-fatigue. The failure scenario was suggested based on the results obtained
Original languageEnglish
Article number900
Number of pages8
JournalMaterials
Volume13
Issue number4
DOIs
Publication statusPublished - 2020

Keywords

  • gas turbine
  • corrosion-fatigue
  • blades
  • failure

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