Ultra-High Cycle Fatigue Behavior of DZ125 Superalloy Used in Turbine Blades

Abstract:

The high temperature ultra-high cycle fatigue (UHCF) behaviors of DZ125 superalloy used in aero-engine turbine blades were systematically studied. The results show that the fatigue fracture still occurs above 10⁸ at the frequency of 20kHz, R=-1 and 700°C. There is a negligible frequency effect for the DZ125 superalloy, therefore, it is proposed that the ultrasonic fatigue testing could be expected as an accelerated fatigue testing method. Fatigue cracks originate from the subsurface of the specimens, where have no metallurgy defects or “fish eye” character. The crystal orientation change of the alloy is very little after fatigue.The maximum value changed for the elastic modulus of the alloy is about 30GPa after fatigue compared with that before fatigue.

• Periodical: Key Engineering Materials (Volume 664)
• Pages: 96-103
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.664.96
• Online since: September 2015
• Authors: Yu Li Gu, Chun Hu Tao
• Keywords: Crystal Orientation, Directionally Solidified Superalloy, Elastic Modulus, Frequency, Ultra-High Cycle Fatigue

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