Abstract
The influence of prior cyclic loading on Stage-1b stress corrosion cracking (SCC) growth of X52 pipeline steels was investigated. Results showed that Stage-1b SCC growth was observed for pre-cyclically-loaded specimens under subsequent cyclic loading at the maximum stress intensity factor of 16 MPa m0.5 rather than those without pre-cyclic-loading. Large magnitude of prior stress cycles favored the SCC crack growth and its transition. Intergranular attack by static corrosion contributed marginally to the Stage-1b crack growth. Prior cyclic loading plus heat treatment facilitated strain-aging-assisted SCC crack growth. Removal of the plastically deformed regions before re-coating could reduce the cracking susceptibility.
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