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Long-Term Predictions Relating to Environment Sensitive Cracking.

Published online by Cambridge University Press:  01 January 1992

R. N. Parkins
R. N. Parkins*
Affiliation:
University of Newcastle upon Tyne, Newcastle upon Tyne, NEI 7RU, England
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Abstract

Consideration is given to the environmental requirements of environment sensitive cracking (ESC) of ferritic steels, involving hydrogen-induced or dissolution-related mechanisms of cracking. Pitting, with associated local pH changes, may result in hydrogeninduced cracking of simple ferritic steels, as has been observed with high pressure gas pipelines in contact with ground waters, and may constitute a greater potential failure mechanism for waste containers than dissolution-related cracking with its requirement of relatively concentrated solutions. However, the stochastic nature of pit initiation, together with the distributions of crack nucleation and growth rates, suggest that a probabilistic, as opposed to a purely deterministic, approach will need to be applied to life prediction estimates for waste containers.

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References

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