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Effects of waveform and cycle period on corrosion-fatigue crack growth in cathodically protected high-strength steels

journal contribution
posted on 2023-12-12, 03:40 authored by M Knop, N Birbilis, S Lynch
The processes involved in corrosion fatigue in general are briefly outlined, followed by a brief review of recent studies on the effects of cycle frequency (rise times) and electrode potential on crack-growth rates at 'intermediate' ΔK levels for cathodically protected high-strength steels. New studies concerning the effects of fall times and hold times at maximum and minimum loads on crack-growth rates (for Kmax values below the sustained-load SCC threshold) are presented and discussed. Fractographic observations and the data indicate that corrosion-fatigue crack-growth rates in aqueous environments depend on the concentration of hydrogen adsorbed at crack tips and at tips of nanovoids ahead of cracks. Potential-dependent electrochemical reaction rates, crack-tip strain rates, and hydrogen transport to nanovoids are therefore critical parameters. The observations are best explained by an adsorption-induced dislocation-emission (AIDE) mechanism of hydrogen embrittlement. © (2014) Trans Tech Publications, Switzerland.

History

Journal

Advanced Materials Research

Volume

891-892

Pagination

211-216

Location

AUSTRALIA, Melbourne

ISSN

1022-6680

eISSN

1662-8985

Language

English

Editor/Contributor(s)

Clark G, Wang CH

Publisher

TRANS TECH PUBLICATIONS LTD