Abstract
This paper deals with the basic characteristics of surface micro-cracks on unnotched smooth specimens of Type 304 stainless steel under creep and creep-fatigue condition with holding time of 1 and 10 minutes respectively at 538°C in air. The behaviors of the microcracks have been analysed via surface replica method and photomicrographs techniques. Quantitative information, such as initiation period, growth and coalescence behavior, statistical distributions of crack length, density of cracks, distribution patterns and crack growth properties, was obtained. Knowledge of these parameters is critical for the application of fracture mechanics to the life assessment and the damage evaluation of structures at elevated temperature.
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