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Open AccessArticle

Notch Corrosion Fatigue Behavior of Ti-6Al-4V

GITT - Centre on Innovation Management and Technology Transfer, University of Bergamo, Via Salvecchio 19, Bergamo 24129, Italy
Department of Engineering, University of Bergamo, Viale Marconi 5, Dalmine 24044, Italy 
Materials 2014, 7(6), 4349-4366;
Received: 8 February 2014 / Revised: 9 May 2014 / Accepted: 30 May 2014 / Published: 11 June 2014
(This article belongs to the Special Issue Corrosion of Materials)
The aim of this paper is to map the corrosion fatigue characteristics of Ti-6Al-4V alloy through the evaluation of the corrosion fatigue initiation and failure mechanisms. The study included the effect of the stress concentration factor at very high Kt values and the role of different inert or corrosive environments. This alloy is widely used in naval-structures and aero-engine communities and the outcomes of the work will have direct relevance to industrial service operations. Axial fatigue tests (R = 0.1; 2 × 105 cycles; f = 10 Hz) were carried out on smooth and high notched (Ktmax = 18.65) flat specimens in laboratory air, paraffin oil, laboratory air + beeswax coating, recirculated 3.5% NaCl solution. The step loading procedure was used to perform the fatigue tests and the surface replica method and crack propagation gages were used to check crack nucleation and propagation until failure. Log-Log plots of σmax vs. Kt showed a bilinear behavior and enabled the demonstration of the presence of a threshold stress intensity factor (Kt = 8–9), after which the environment has no effect on the fatigue damage for all the tested environments. View Full-Text
Keywords: Ti-6Al-4V; corrosion fatigue; high notch; Kt effect Ti-6Al-4V; corrosion fatigue; high notch; Kt effect
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Baragetti, S. Notch Corrosion Fatigue Behavior of Ti-6Al-4V. Materials 2014, 7, 4349-4366.

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