Investigation of HP Turbine Blade Failure in a Military Turbofan Engine
| Autor: | K. Srinivasan, R. K. Mishra, Vaishakhi Nandi, R. Raghavendra Bhatt, Johny Thomas |
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| Rok vydání: | 2017 |
| Předmět: |
Engineering
animal structures Blade (geometry) Turbine blade business.industry 020209 energy food and beverages Aerospace Engineering Fractography 02 engineering and technology Energy engineering Turbine Turbofan Curling law.invention 020303 mechanical engineering & transports stomatognathic system 0203 mechanical engineering law 0202 electrical engineering electronic engineering information engineering Aerospace engineering business |
| Zdroj: | International Journal of Turbo & Jet-Engines. 34 |
| ISSN: | 2191-0332 0334-0082 |
| DOI: | 10.1515/tjj-2015-0049 |
| Popis: | Failure of a high pressure (HP) turbine blade in a military turbofan engine is investigated to determine the root cause of failure. Forensic and metallurgical investigations are carried out on the affected blades. The loss of coating and the presence of heavily oxidized intergranular fracture features including substrate material aging and airfoil curling in the trailing edge of a representative blade indicate that the coating is not providing adequate oxidation protection and the blade material substrate is not suitable for the application at hand. Coating spallation followed by substrate oxidation and aging leading to intergranular cracking and localized trailing edge curling is the root cause of the blade failure. The remaining portion of the blade fracture surface showed ductile overload features in the final failure. The damage observed in downstream components is due to secondary effects. |
| Databáze: | OpenAIRE |
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