A phenomenological model is developed for environmentally assisted cracking of pipeline steels in the near-neutral pH soil environments, based on the hypothesis that the cracking is dominated by the corrosion fatigue mechanism promoted by hydrogen embrittlement. The comparison with the data of laboratory indicates that the new model can provide reasonable predictions for the dependence of the crack growth rates on the stress intensity factor, stress ratio, loading frequency, solution pH and electrochemical potential.

Subject
Hydrogen induced cracking, Crack growth, Steel surfaces, Materials, Hydrogen concentration, Pipelines, Corrosion cracking, Stress cracking, Groundwater, Stress, Experimental data, Steel, Hydrogen
Keywords:
stress corrosion cracking, pipeline steel, chemistry, pH
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2012
Association for Materials Protection and Performance (AMPP)
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