Corrosion Fatigue 2

This pump shaft in nickel-copper alloy K-500 failed by corrosion fatigue. The fatigue started at a pit caused by crevice corrosion in seawater, something that this alloy can be susceptible to. The pit then acted as a stress raiser, which increased local stresses sufficiently to initiate fatigue. This was an expensive failure as significant damage was done to the pump internals when the failure occurred.

Posted on: 21st June 2016

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Image (top left) by Agnieszka