Corrosion-Fatigue Failure of Gas-Turbine Blades in an Oil and Gas Production Plant
Mojtaba Rajabinezhad (Isfahan University of Technology)
Abbas Bahrami (Isfahan University of Technology)
Mohammad Mousavinia (Pars Oil and Gas Company)
Seyed Jalil Seyedi (National Iranian South Oilfields Company)
P. Taheri (TU Delft - (OLD) MSE-6)
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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
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