Pit to crack transition and corrosion fatigue lifetime reduction estimations by means of a short crack microstructural model. (March 2021)

• Record Type: Journal Article
• Authors: Balbín, J.A.; Chaves, V.; Larrosa, N.O.
• Is Part Of: Corrosion science. Volume 180(2021)
• Publication Date: 2021-03
• Subjects: Fatigue strength -- Pitting corrosion -- Pit-to-crack transition -- Short cracks -- Micromechanical model; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2020.109171
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: The propagation of short cracks from corrosion pits has been studied through a micromechanical model. Pit-to-crack transition and fatigue endurance are assessed taking into account the effects of pit local topology and the environment. Model validation is carried out using available pitting corrosion fatigue data in open literature. Abstract: A microstructural model is presented to assess pit-to-crack transition and corrosion fatigue strength in pitted components in different environments. The model is first validated using available experimental data in the literature for pitting corrosion fatigue strength and S-N curves for both carbon and stainless steels. The value of the method proposed and its applicability is then shown by the development of fatigue knock down factor maps to the in-air S-N curve. Finally, the influence of pit local topology on pit-to-crack transition damage tolerance and the links to the NDE methods quantitative resolution necessary to account for defect shape or acuity in structural integrity assessments are discussed.