Abstract
Fatigue strength in high humidity environment has been studied for ordinary structural steels such as SS400 and HT800. Cracks are easily initiated in the early stage beyond the critical humidity (between 70 pct RH and 80 pct RH), because steels are subject to localized corrosion. Fatigue strength is reduced markedly and is almost the same as that in ion-exchanged water. Thus, a transition of environmental fatigue strength was found with increasing humidity for ordinary structural steels. At high room temperature (40°C), the transition moves to a lower relative humidity, because corrosion and cracks initiate more easily.
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More From: TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A
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