Abstract
The characteristics of small fatigue crack growth for a high strength steel SNCM 439 were investigated. The tests were conducted under constant stress range or constant stress intensity range conditions at a cyclic frequency of 1 Hz in room air and a 1 % NaCl solution. Crack growth rates of small cracks were accelerated markedly in the 1 % NaCl solution, as compared to those of long cracks under the same conditions. The crack growth rates under constant stress intensity range in the 1 % NaCl solution decreased with increasing crack length. This result indicates that the chemical driving force decreases as the crack grows. Under static SCC, the small crack grew at a stress intensity below KI SCC of the long crack. It is suggested that the SCC behavior of the small crack is responsible for the chemically short crack.
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