Severe localized serious cracks of 0Cr17Ni4Cu4Nb alloy turbine blades after years of service are analyzed by means of the macro-morphology, micro-morphology (SEM) and energy dispersion spectrum (EDS). The centrifugal stress and vibration characteristics of the blades are calculated and analyzed under the prestressed condition by finite element simulation. The results show that the failure of the blades is due to the stress corrosion mainly. The impeller blade system cannot avoid the region of “triple points” resonance during the actual operation, and torsional deformation occurs under this vibration stress. Stress concentration leads to the crack initiation and propagation, and fatigue cracks appear and then propagate. Corrosive elements of O, Na and S found on the surface of fracture will accelerate the corrosion.
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This work was financially supported by the Education Department Foundation in Shaanxi, China (No. 18JK0348), Xi’an Polytechnic University Foundation in Shaanxi, China (No. 107020023).
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