Comprehensive and Detailed Explanation From Exact Extract:
According to API RP 571, corrosion fatigue results from the combined action of a cyclic stress and a corrosive environment. One of the most important distinguishing features between corrosion fatigue and SCC is crack morphology.
Corrosion fatigue cracks are typically transgranular and show little or no branching
Stress corrosion cracking is characterized by extensive crack branching
Therefore, the absence of significant branching is a key diagnostic feature of corrosion fatigue.
Referenced Documents (Study Basis):
API RP 571 – Section on Corrosion Fatigue
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