Abstract
Fatigue crack growth (FCG) behavior of ferritic steel P91 and austenitic stainless steel 316LN (SS 316LN) has been studied at ambient temperature. Acoustic emission (AE) signals generated during FCG tests were captured using 375 kHz resonant transducer. The FCG and AE results were compared for both steels in Paris and threshold regimes. The AE results indicated five and four substages of FCG for P91 steel and SS 316LN, respectively. Several parameters of AE signals such as rise time, peak amplitude and event duration were used to differentiate between various substages of the FCG. AE cumulative count was correlated with stress intensity factor range (ΔK) in Paris regime for both the steels. For SS 316LN, the exponent of the correlation of AE cumulative count with ΔK is in good agreement with Paris exponent. For P91 steel, higher value of the exponent of the AE cumulative count—stress intensity factor range correlation compared to Paris exponent is observed. Monitoring of AE continuously during fatigue crack growth of these two steels enables understanding the mechanisms of crack growth operative at different regions of the FCG curve.
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