Abstract
Effects of loading frequency (0.1-10 Hz) and temperature (4-75 °C) on fatigue-crack growth behaviour in water environment were studied on low-alloy high-strength steel of grade 38MnSiCr2Ni2Mo. Fatigue-crack growth rates in distilled water increased significantly compared with these in air for loading frequency lower than or equal to 1 Hz. Besides the loading frequency the kinetics of fatigue-crack growth in the studied steel is strongly influenced by ΔK and water temperature.

Key words
fatigue-crack growth behaviour, high-strength steel, loading frequency, range of stress intensity factor, hydrogen embrittlement

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