Zhou, S; Lukaszewicz, M; Turnbull, A (2015) Small and short crack growth and the solution-conductivity dependent electrochemical crack size effect. Corros. Sci., 97. pp. 25-37.

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Abstract

Corrosion fatigue small crack growth rates have been determined for a 12Cr steam turbine steel in air and in a simulated condensate solution under conditions representing repetitive turbine start-up and shut-down (known as two-shifting operation). Cracks were grown from a single corrosion pit generated galvanostatically using the droplet technique and the crack extension monitored optically and by direct current potential drop. The remarkably enhanced crack growth rate observed previously for a short crack (relative to that for a long crack) was not evident for the small crack. In contrast, the stress corrosion small crack growth rate determined in aerated 35 ppm Cl-, representing a system excursion, was markedly increased with respect to the long crack growth and somewhat greater than that for the short crack. The concept of the solution-conductivity dependent electrochemical crack size effect is introduced to provide a fundamental framework to rationalise the disparate results. The engineering implications for two-shifting operation are discussed.

Item Type:	Article
Keywords:	stainless steel, steam turbine, pitting, corrosion fatigue, stress corrosion cracking
Subjects:	Advanced Materials Advanced Materials > Corrosion
Identification number/DOI:	10.1016/j.corsci.2015.03.008
Last Modified:	02 Feb 2018 13:13
URI:	http://eprintspublications.npl.co.uk/id/eprint/6741

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