Methodology for a mechano-electrochemical evaluation of the coupling at the crack tip. Application of halide-induced Stress Corrosion Cracking of Zircaloy-4

E. Durif (1) , Marion Fregonese (2) , Julien Réthoré (1) , A. Combescure (1) , C. Alemany-Dumont (2)

1 LaMCoS - Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne]
2 MATEIS - Matériaux, ingénierie et science [Villeurbanne]

In order to evaluate the relative contribution of both mechanical and electrochemical processes at the crack tip during Stress Corrosion Cracking propagation, an original combination of controlled pre-cracking followed by thermal pre-oxidation of SCC specimens was developed. It allowed localizing dissolution at the crack tip for Zircaloy-4 tested in halide solutions under potentiostatic polarization. Digital Image Correlation and electrochemical methods were then carried out to study correlations between the stress intensity factor, the crack length and the measurements of dissolution current.

Mots clés: Stress corrosion cracking; Potentiostatic polarization; Zirconium alloys; Digital image correlations; Strain measurement; Residual stresses; Image analysis; Crack propagation; Corrosion

Domaines: Mécanique des matériaux [physics.class-ph]; Matériaux

E. Durif, Marion Fregonese, Julien Réthoré, A. Combescure, C. Alemany-Dumont. Methodology for a mechano-electrochemical evaluation of the coupling at the crack tip. Application of halide-induced Stress Corrosion Cracking of Zircaloy-4. Corrosion Science, 2015, 93, pp.39-47. ⟨10.1016/j.corsci.2015.01.010⟩. ⟨hal-01804705⟩