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۱Stress – Corrosion Crack Initiation of High–strength Pipeline Steel in Near–neutral pH Environments
اطلاعات انتشار: International Journal of iron and steel society of Iran، سوم،شماره۱(پياپي ۴)،۲۰۰۶، سال
تعداد صفحات: ۶
Stress–co rrosion cracking (SCC) tests were conducted in the near–neutral pH standard solution, NS4, and in an actual soil solutio n, using four–point bending at a high stress ratio and low frequency conditions very similar to those o f op erational pipelines. Pitting incubation appeared first and then pitting initiated and grew in both solutions although there were many more pits on the specimen tested in soil purged with 5% CO2 +95 %N2 than in the specimen tested in NS4 solution purged with the same gas. These observations sho w that samples in soil solution are more susceptible to pitting than those in NS4 solution. When the pit reached a critical size, the increased stress concentration around the pits, resulted in transition to a crack.
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