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Corrosion Fatigue

Corrosion Fatigue - the process wherein a metal fractures prematurely under conditions of simultaneous corrosion and repeated cyclic loading at lower stress levels or fewer cycles than would be required to cause fatigue of that metal in the absence of the corrosive environment. [1]


During
Corrosion Fatigue - also termed Corrosion Fatigue Cracking (CFC) - the cyclic stress can be superimposed on a static stress. Cracks tend to be non-branched, and have a relatively blunt tip. A crack is more likely to contain corrosion products than in the case of Stress Corrosion Cracking (SCC).

Beach marks may be present, and are a result of discontinuous cracking which permits the accumulation of corrosion products during an interval when the crack is not advancing.

The frequency of the cyclic stress is important - with a low frequency cycle being more deleterious.
Corrosion Fatigue - the process wherein a metal fractures prematurely under conditions of simultaneous corrosion and repeated cyclic loading at lower stress levels or fewer cycles than would be required to cause fatigue of that metal in the absence of the corrosive environment. [1]

During
Corrosion Fatigue - also termed Corrosion Fatigue Cracking (CFC) - the cyclic stress can be superimposed on a static stress. Cracks tend to be non-branched, and have a relatively blunt tip. A crack is more likely to contain corrosion products than in the case of Stress Corrosion Cracking (SCC).

Beach marks may be present, and are a result of discontinuous cracking which permits the accumulation of corrosion products during an interval when the crack is not advancing.

The frequency of the cyclic stress is important - with a low frequency cycle being more deleterious.
[1] NACE/ASTM G193-10b Standard Terminology and Acronyms Relating to Corrosion, 2010. All rights reserved by NACE. (Reprinted with Permission)
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