Low-temperature cyclic crack resistance of steels of railroad wheels
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We have established that the steels of high-and medium-strength railroad wheels in the presence of fatigue-crack-type defects are susceptible to low-temperature (up to −60°C) embrittlement only for high amplitudes of cyclic loading, when the growth rate of a fatigue crack exceeds 10−7 m/cycle. Here, the temperature of cyclic ductile-brittle transition for these steels constitutes −20 and −40°C, respectively. We have shown that the permissible and temperature-independent (within the range from 20 to −60°C ) size of a fatigue crack on the rim surface of the wheels under study does not exceed 1.9–2.5 mm for a hoop stress range of 400 MPa and 0.6–0.8 mm for 700 MPa. These results enable us to conclude that, for high-strength railroad wheels working at low climatic temperatures, it is necessary to carry out their flaw inspection with sensitivity to surface cracks of millimeter size.
KeywordsFatigue Fatigue Crack Stress Intensity Factor Fatigue Threshold Wheel Steel
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