Effect of pre-strain on the electrochemical and stress corrosion cracking behavior of E690 steel in simulated marine atmosphere

摘要

Slow strain rate tests and constant strain corrosion tests were employed to study the effect of pre-strain on stress corrosion cracking behavior and initiation mechanism of E690 steel in simulated marine atmosphere. Results revealed that pre-strain can result in enhancement of both anodic and cathodic reactions of E690 steel in simulated marine atmosphere. Intergranular corrosion and microcracks formed after 4 days of exposure in sulfite-containing marine atmosphere at constant pre-strain, which consequently caused detrimental effects on the mechanical properties and subsequent SCC behavior of E690 steel. The presence of sulfite and high-angle grain boundaries of prior austenite grain boundaries (PAGBs) accounted for the intergranular corrosion and SCC initiation along PAGBs.