Metallurgical Failure Analysis, Mark Douglas Bell, PE, Consulting Metallurgical Engineer, San Diego, California, USA Bell Metallurgy
Metallurgical Failure Analysis
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Mark Douglas Bell, PE
Consulting Metallurgical Engineer

Corrosion Fatigue

When a component is in a corrosive environment and also subject to fatigue loading the combination of both corrosion and fatigue will accelerate the failure. One characteristic of corrosion-fatigue is multiple initiation cracks. These grow by the crack propagating by fatigue and also from corrosion. Eventually one crack will predominate and it will grow to a greater extent that the remaining cracks. This predominate crack will lead to the failure. Springs, shafts and fasteners are subject to corrosion-fatigue.

Material selection, control of service environment, design and inspection are methods to control corrosion-fatigue.

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