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• W2345018090 abstract "In the interaction of a medium with the surface of a cyclically deformed sample, failure occurs as the result of the adsorption effect, local anodic dissolution of microdefects or the crack tip, and also cathodic hydrogen embrittlement. Anodic dissolution accelerates failure only if its rate is somewhat lower than the rate of fatigue crack advance. In the opposite case, surface microdefects and the crack tip are blunted and failure is retarded. In a number of cases, cooling of the sample promotes retarding of failure [i]. The effectiveness of the medium action on fatigue depends upon the amplitude and frequency of the load cycle. With low loads an increase in frequency chemically activates the metal and strengthens the action of the medium. At high loads the process of mechanical failure is accelerated to such a degree that the medium is not able to penetrate into the prefailure zone in front of the crack and to act on it electrochemically. With a constant loading frequency an increase in the cycle amplitude either weakens or strengthens the role of the medium. In the general case the interaction of these factors determines the process of low-cycle corrosion fatigue [5]. Earlier [6-8] the influence of cycle frequency and form on the low-cycle fatigue resistance of steel in sea water was investigated on notched samples in which the mechanical factor is the main one and the role of the medium is reduced as the result of the shortness of the tests. In tests of unnotched samples the fatigue resistance was determined as the number of cycles until complete failure of samples [9, I0]. The purpose of this article is an investigation of the low-cycle fatigue of structural steel in sea water in the stage of origin and propagation of cracks all the way to final failure of the sample. Unnotched, flat, polished 2.5-mm-thick samples of 15KhNbDMF steel were tested by subjecting them to starting-from-zero pure bending on a IPPU machine [6] with frequencies of 167, 16.7, and 1.67 mHz with a trapezoidal loading cycle (Fig. i). In the latter case the length of loading and unloading is 3 or 30 see (T t = 600 sec). The amplitude of cycle deformation (e = 0.95%) corresponded to the yield strength in bending. A portion of the tests was made with amplitudes of e = 1.25 and 1.75%. The change in sample surface microrelief was recorded with the use of an MIM-7 microscope. The low-cycle fatigue resistance in the various stages was determined from the average value of the number of cycles N for three to five" @default.
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• W2345018090 date "2005-01-01" @default.
• W2345018090 modified "2023-09-27" @default.
• W2345018090 title "IN 15KhN5DMF STEEL IN SEA WATER" @default.
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