Abstract
The crack growth behaviours of E690 steel and HAZ microstructures under cathodic potential in artificial seawater were investigated and compared. The crack growth behaviours of three HAZ microstructures and basic metal are determined by mechano-electrochemical interaction at crack tip, and growth paths are different due to the change of microstructures. As cathodic potential negatively decreases, the crack growth rates (CGRs) of four microstructures first decrease and then increase with the minimum CGR at − 750 mV, which depends on the variation of hydrogen concentration. Applying cathodic potential is impossible to restrain crack growth, but can slow the CGR at an optimized potential.
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