Fatigue experiments have been performed upon keyhole compact tension specimens of A710 Class 2, X70 and a microalloyed quenched and tempered (designated QT108) steel. A natural sea water environment was employed for the first two with potential ranging from free corrosion to -1.10v., SCE. For A710, experiments were also performed in laboratory air (relative humidity 45-60%) and dry air, as was the case for QT108. The sea water/constant cathodic potential data for both steels investigated conformed to a trend where endurance increased with decreasing potential in the range free corrosion to -0.90., SCE, and decreased with increased polarization for -1.10 < φ < -1.00. This was in spite of the fact that different crack initiation mechanisms were apparently important for the two steels. The observation that endurance in laboratory air and sea water at -1.10v. was approximately the same was related to pitting in the atmospheric case with an associated hydrogen production rate comparable to that at -1.10v.

Subject
Cathodic polarization, Corrosion fatigue, Water, Cathodic potential, Crack initiation, Stress, Negative potentials, Experimental data, Steel, Risk reduction, Fatigue, Endurance limit, Hydrogen
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1989
Association for Materials Protection and Performance (AMPP)
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