Abstract
While plant experience so far has shown excellent resistance of Alloy 690 to stress corrosion cracking in PWR primary water environments, laboratory tests have reported that susceptibility may be enhanced substantially by non-uniform cold working, particularly when the plane of crack growth is in the plane of rolling or forging. The Alloy 690 program aims to further the understanding of the mechanisms behind this susceptibility and the heat-to-heat variability reported for different materials.
This paper contains results from crack growth tests and related metallography for different heats of Alloy 690.
The four heats of Alloy 690 tested in this program possess a range of microstructural properties from heavily banded to highly homogeneous. All of the heats were susceptible to IGSCC propagation to some degree after being subjected to non-uniform cold working, with crack growth rates varying between approximately 1x10−11 to 5x–10−10 ms−1 after correcting for incomplete intergranular engagement of the crack front in some specimens. The results show that the level of inhomogeneity in the microstructure (i.e. banding) is not necessarily an indication of the level of susceptibility. The cause of higher susceptibility to IGSCC and the plant relevance of a highly cold worked material are subjects of much interest and debate.
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© 2011 TMS (The Minerals, Metals & Materials Society)
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Tice, D.R., Medway, S.L., Platts, N., Stairmand, J.W. (2011). Crack growth testing on Cold Worked Alloy 690 in Primary Water Environment. 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_6
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DOI: https://doi.org/10.1007/978-3-319-48760-1_6
Publisher Name: Springer, Cham
Online ISBN: 978-3-319-48760-1
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