The influence of microstructure on the fatigue crack growth rate in marine steels in the Paris Region

Victor Igwemezie, Ali Mehmanparast, Feargal Brennan

Research output: Contribution to journalArticle

Abstract

This paper presents a study on the effect of microstructure on the fatigue crack growth (FCG) rate in advanced S355 marine steels in the Paris Region of the da/dN versus ΔK log–log plot. The environments of study were air and seawater (SW), under constant amplitude sinewave fatigue loading. Fundamentally, three phenomena (crack tip diversion, crack front bifurcation and metal crumb formation) were observed to influence the rate of FCG. These phenomena appear to be a function of the material microstructure, environment and crack tip loading conditions. The three factors retarded the crack growth by reducing or redistributing the effective driving force at the main active crack tip. A crack path containing extensively the three phenomena was observed to offer strong resistance to FCG. In SW, the degree of the electrochemical dissolution of the microplastic zone appears to be an additional primary factor influencing FCG in the steels.

Original languageEnglish
Pages (from-to)2416-2440
Number of pages25
JournalFatigue and Fracture of Engineering Materials and Structures
Volume43
Issue number10
Early online date28 Jul 2020
DOIs
Publication statusPublished - 1 Oct 2020

Keywords

  • corrosion fatigue
  • crack path
  • crack tip blunting
  • microstructure
  • Paris Region
  • S355 steel

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  • Projects

    REMS

    Brennan, F.

    EPSRC (Engineering and Physical Sciences Research Council)

    1/06/1831/10/22

    Project: Research - Studentship

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