Plastic Strain Fatigue of High Tensile Steel in Corrosive Media

概要

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Plastic strain fatigue tests have been carried out on high tensile steel specimens in saline to observe the plastic fatigue characteristics in corrosive media. Electrode potential was measured to explain the corrosion behaviours under cyclic strains. Corrosive media decrease the fatigue strength in terms of plastic strain range or total strain range, whilst the relation between the total amount of plastic work and cycles to failure is not affected by corrosive media. Plastic strain range is greater in corrosive media than in air under the same total strain range, and this is the cause for the decreased fatigue lives in corrosive media. Cycle frequency lower than 2.7 c/min has no effects on the corrosion fatigue strength, because the corrosion potential of specimens follows perfectly the strain varying at such a low cycle frequency, neither is observed the effects of cycle frequency on the potential variation with the progress of cycles.
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