Guo, L; Zhou, S; Crocker, L; Turnbull, A (2016) Characterisation of initiation sites for cracks developed from pits in a shot-peened 12Cr blade steel. NPL Report. MAT 83

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Abstract

A serial sectioning procedure was carried out on a shot-peened 12Cr martensitic stainless steel to determine the location of fatigue crack initiation sites from pits of varying depth. Multiple cracks, including fully-developed cracks (surface-breaking cracks extending beyond the pit base) and non-fully-developed cracks, were observed for pits of depth greater than 70 µm. If the longest crack at each side of the pit was assumed to be the "dominant" crack, most "dominant" cracks did not initiate near the pit base despite a propensity for macro-stress and strain localisation to the pit base.

Item Type:	Report/Guide (NPL Report)
NPL Report No.:	MAT 83
Subjects:	Advanced Materials Advanced Materials > Corrosion
Last Modified:	02 Feb 2018 13:13
URI:	http://eprintspublications.npl.co.uk/id/eprint/7274

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