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The Role of Electrochemical Factors in the Initial Stage of Fatigue-Corrosion Destruction of Stainle |
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09.09.2008 г. |
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The Role of Electrochemical Factors in the Initial Stage of Fatigue-Corrosion Destruction of Stainless Steels V. I. Pokhmursky and M. S. Khoma Karpenko Physicomechanical Institute, National Academy of Sciences of Ukraine, ul. Naukova 5, Lvov, 79601 Ukraine E-mail:
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Received April 13, 2006 Abstract — The corrosion-fatigue destruction of stainless steels of different classes is studied. It is shown that a decrease in their endurance limit in chloride media is determined by their structure, rather than chemical composition and strength. Based on the electrochemical studies of cyclic-deformed steel samples, their additional deformation dissolution during the period of cracks initiation was calculated. An electrochemical criterion of the susceptibility of corrosion-resistant steels to a corrosion fatigue is suggested and its characteristic analytical formula is derived. The criterion is based on the mutual correlation between the metals’ relative deformationdissolution at the strain equal to the fatigue limit on one hand and the degree of decrease in their endurance under the effect of environment on the other. The occurrence of physical limit of the corrosion fatigue for passive metals is demonstrated. A nondestructive method of determining the corrosion fatigue limit of corrosionresistant steels, based on the change in the sign of polarizing current is developed, and accelerates the tests by a factor of 10–15 PACS numbers: 81.65.Kn, 82.20.Wt DOI: 10.1134/S0033173207030071
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