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

Intergranular Corrosion

This is a localized form of corrosion found in some stainless steels. Welding, casting and heat treating are processes that put enough heat into the stainless steels that carbon will migrate to grain boundaries and form chromium carbides. The grain boundary areas will be attacked because the chromium is not available to form the needed corrosion resistant chromium oxide film.

Controlling the heat input, keeping carbon low, alloying with large amounts of chromium and other alloys and solutionizing the component after processing will all prevent intergranular corrosion.

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