Abstract
The growth characteristics data of a chemically short crack were generated for a high strength steel SNCM 439. The tests were conducted with axial loading under constant stress range at cyclic frequencies of 0.1, 1.0 and 10 Hz in room air and a 1% NaCl solution. The effect of cyclic frequency on short crack growth in a corrosive environment was evaluated and the results compared to long crack growth data generated with CCT specimens. The growth rates of short cracks were accelerated markedly in the 1% NaCl solution, as compared to those of long cracks under the same frequency. Furthermore, the short crack growth rates in the 1 % NaCl solution increased with decreasing cyclic frequency. These results indicate that the cyclic frequency is concerned with the chemical driving force of a short crack in a corrosive environment.
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