Novel images of the evolution of stress corrosion cracks from corrosion pits |
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Authors: | DA Horner BJ Connolly S Zhou L Crocker A Turnbull |
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Affiliation: | aUniversity of Birmingham, Metallurgy and Materials, Edgbaston, Birmingham, West Midlands B15 2TT, UK;bNational Physical Laboratory, Teddington, Middlesex TW11 0LW, UK |
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Abstract: | SCC in turbine disc steels exposed to simulated steam-condensate tends to nucleate preferentially from corrosion pit precursors. The evolution of these cracks is not straightforward and not well understood. In this work, unique three-dimensional X-ray microtomographic images have confirmed that cracks develop predominantly at the shoulder of the pit, near the pit/surface interface, for specimens stressed to 50–90% σ0.2. In support of this observation, FEA of model pits indicate that strain is a maximum on the pit wall just below the pit mouth. Implications of these observations for the pit-to-crack transition and predictive-modelling of crack nucleation and growth are discussed. |
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Keywords: | A Low alloy steel C Pitting corrosion C Stress Corrosion |
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