Abstract
Susceptibility of SA-543 steel, its welds (with and without stress relief treatment), and the heat-affected zone (HAZ) to stress corrosion cracking (SCC) was investigated in de-aerated and aerated boiler feed water subjected to the all-volatile treatment (AVT-BFW), and distilled water at 275 °C using the slow strain rate testing (SSRT) technique. The SSRT specimens were tested at three extension rates (3.50 × 10−6, 9.00 × 10−6, and 7.50 × 10−5 mm/s) using a novel SCC testing rig capable of testing at high temperatures and pressures. There are no significant differences in the time-to-failure among the four tested specimens. The elongation of the specimens at the time of failure is in the range of 10-23%. The reduction of the cross-sectional area of the failed specimens is large (45-77%) and the absence of any signs of intergranular propagation in fractured specimens, determined by scanning electron microscopy, indicates that the failure is due to mechanical load and not due to SCC. Dissolved oxygen does not affect the susceptibility of the specimens to SCC, which could be due to the inhibition effect of the test solution. SA-543 steel as the base metal, its welds (with and without stress relief treatment), and the HAZ are suitable for use in hot AVT-BFW and distilled water.
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The authors would like to acknowledge the Center for Engineering Research/Research Institute at King Fahd University of Petroleum & Minerals for conducting the research and Saudi Basic Industries Corporation (SABIC) for supporting this research.
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Rihan, R., Basha, M., Al-Meshari, A. et al. Stress Corrosion Cracking of SA-543 High-Strength Steel in All-Volatile Treatment Boiler Feed Water. J. of Materi Eng and Perform 24, 3773–3782 (2015). https://doi.org/10.1007/s11665-015-1681-0
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DOI: https://doi.org/10.1007/s11665-015-1681-0