Wickstrom, L; Mingard, K P; Hinds, G; Turnbull, A (2016) Microcrack clustering in stress corrosion cracking of 22Cr and 25Cr duplex stainless steels. Corros. Sci., 109. pp. 86-93.

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Abstract

A metallographic study of Stress Corrosion Cracking (SCC) present on Duplex Stainless Steel (DSS) and Super Duplex Stainless Steel (SDSS) after drop evaporation testing has been undertaken. Preferential cracking in the ferrite phase, in the form of microcrack clusters, was observed for both steels and examined in more detail by Electron Back Scatter Diffraction (EBSD) and Focused Ion Beam (FIB)-Scanning Electron Microscopy (SEM). There was no evidence to support pitting corrosion acting as a precursor to cracking. Microplastic deformation induced film disruption would appear a more viable mechanism of crack initiation but no specific evidence slip lines could be identified within the constraints of resolution of the SEM. FIB milling revealed subsurface crack branching parallel to the applied stress direction as well as crack coalescence and propagation perpendicular to the surface. Observation of the latter suggests that simple crack coalescence models based on proximity of surface cracks may need to be re-considered.

Item Type:	Article
Subjects:	Advanced Materials Advanced Materials > Corrosion
Identification number/DOI:	10.1016/j.corsci.2016.03.024
Last Modified:	02 Feb 2018 13:13
URI:	http://eprintspublications.npl.co.uk/id/eprint/7132

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