Journal
CORROSION SCIENCE
Volume 179, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2020.109136
Keywords
Pressure vessel low alloy steel; Stress corrosion cracking; Chloride; Boiling water reactor; Crack growth; Crack-tip strain rate
Funding
- Electric Power Research Institute
- Auburn University
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This study found that chloride levels as low as 3 ppb can increase the stress corrosion cracking susceptibility of low-alloy pressure vessel steel in oxygenated high-temperature water, and sulfur is not the only contributing factor to SCC. The synergy of material, environmental, and mechanical parameters controls the SCC response.
This paper studies the effects of very low-level chloride (< 5 ppb) on the stress corrosion cracking (SCC) growth of low-alloy pressure vessel steel in oxygenated high-temperature water. Chloride levels as low as 3 ppb increase SCC susceptibility. Besides the chemical reason, this paper provides perspectives on the underlying mechanical and metallurgical contributions. A substantial variation was observed from three high-sulphur steels. Sulphur is not the only contributor to SCC. The synergy of material, environmental, and mechanical parameters controlled the crack-tip strain rate and crevice chemistry that govern the SCC response in the high-purity high-temperature water environments at intermediate K.
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