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

Stress Corrosion Cracking

Given the right corrosive environment all alloys will fail by stress corrosion cracking, (SCC). Common alloys that are known to have failed by SCC are steel, stainless steels, brasses, aluminum alloys and titanium alloys. The combination of a stress, temperature and environment will cause SCC. The stress could be residual from welding and processing or it could be from service applied loading. The temperatures vary on alloy but 304 grade stainless steels will fail by SCC in the presence of chlorides at temperature about 140F.

SCC can be controlled by alloy selection, keeping stresses below a certain level, and the most difficult being avoiding the corrosive environment.

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