Abstract
An experimental study of short stress corrosion crack initiation, growth and coalescence has been carried out on two Alloy 600 heats with different susceptibilities to PWSCC.
The key result is that maximum crack length and depth were much lower on the heat that exhibited the higher crack initiation rate. In addition, surface crack growth rates were observed to be much lower than expected from measurements on CT specimens and many cracks tended to become dormant after an initial short crack propagation stage. The coalescence criterion proposed by Parkins was found to be appropriate for the description of PWSC crack coalescence.
These results indicate that predicting the minimum lifetime of a component based on the minimum time for crack initiation and on crack growth rates measured on pre-cracked specimens may lead both to very over-conservative predictions and to a misleading ranking of lifetimes.
The development of a predictive model similar to the Parkins’ model for pipeline steels is not yet possible because it requires:
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More experimental work to obtain data and understanding of the behavior of short cracks. The experimental methodology developed for this study can be used for this purpose;
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A 3-D modeling of the local stresses in presence of an array of short cracks. Such work has been undertaken by Kamaya et al., mainly for stainless steels in high-temperature water.
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Calonne, O., Fournier, L., Combrade, P., Scott, P., Chou, P. (2011). Experimental Study of Short Crack Coalescence in Nickel-Base Alloys in PWR Primary Water. In: Busby, J.T., Ilevbare, G., Andresen, P.L. (eds) Proceedings of the 15th International Conference on Environmental Degradation of Materials in Nuclear Power Systems — Water Reactors. Springer, Cham. https://doi.org/10.1007/978-3-319-48760-1_97
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DOI: https://doi.org/10.1007/978-3-319-48760-1_97
Publisher Name: Springer, Cham
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