Abstract
In order to develop a new method for detecting degradation nondestructively in Udimet520 (U520), which is used for blades of aircraft jet-engine components and land-based gas turbines, fractured and interrupted samples in low-cycle fatigue (LCF) and creep tests were studied using scanning SQUID microscopy (SSM). High temperature LCF and creep experiments on U520 were conducted to obtain various samples with different damage level. Simultaneously, we also examined the artificially degraded samples by optical microscopy, electron backscattering diffraction, and hardness measurements to ensure the damage level. On the basis of the magnetic permeability data, the virgin sample is nonmagnetic. However, for the artificially damaged samples, the observation of magnetic signals on the field maps indicates the potential of SSM to evaluate the degradation in U520 superalloy nondestructively.
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