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ANEXPERIENCEWITHDETECTIONANDASSESSMENT.PDF

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ANEXPERIENCEWITHDETECTIONANDASSESSMENT.PDF

AN EXPERIENCE WITH DETECTION AND ASSESSMENT OF SAC IN A RECOVERY BOILER S. J. Pawel, A. W. Willoughby, H. F. Longmire Oak Ridge National Laboratory 1 Bethel Valley Road Oak Ridge, TN 37831-6156 P. M. Singh Georgia Institute of Technology School of Materials Science and Engineering 500 10th Street NW Atlanta, GA 30318-5794 ABSTRACT Stress-assisted corrosion (SAC) was observed on the waterside of mild steel recovery boiler tubes only at locations exhibiting the combination of a substantial external attachment weld and a significant internal oxide accumulation compared to the nominal Fe O film. Penetrations of up to 30% of the tube wall thickness were 3 4 observed metallographically, and the penetrations were invariably transgranular with bulbous features, rounded tips, and filled with a relatively dense oxide comprised of alternating layers of Fe O and Fe O . Microprobe 2 3 3 4 analysis also revealed the presence of trace quantities (0.1 – 1 at.%) of Cu, Cl, P, and S in the oxide, indicating at least one source of contamination in the boiler feed water. Nondestructive testing, which included two ultrasonic t