Alice DINU, Vasile RADU<br>Chloride Stress Corrosion Cracking of Incoloy - 800

Alice DINU, Vasile RADU
Chloride Stress Corrosion Cracking of Incoloy - 800

Abstract:

To evaluate the susceptibility at chloride stress corrosion cracking of Incoloy-800 used to manufacture the steam generator tubes for CANDU nuclear power plant few electrochemical corrosion tests were conducted in NaCl solution (0.033g/L and 0.33g/L NaCl). The solution concentration ranges were selected starting from the maximum Cl- concentration accepted in the cooling water in the case of CANDU reactors and allowing the concentrated factors that may appear in areas with restricted flow, by boiling. The C-ring method was used to stress the samples. In order to create the spots of mechanical stress, the mechanical pre-cracks with a depth of 100mm or 250mm were inserted in the samples. The increase of the concentration of chlorine together with the local deformation will lead to a higher susceptibility to stress corrosion cracking. In the solution of 0.33g/L NaCl the cracks are always associated with pits. On the other hand, for the samples tested in 0.033g/L NaCl solution it was often observed that cracks did not start from a pit. In both situations, the cracks propagation is transgranular, while the initiation mode differs: when the crack starts from a pit the initiation is transgranular; in the absence of a pit, the initiation of cracks is intergranular. The threshold value of stress intensity factor that has been evaluated in the paper is KImax=4.58 MPa·m-1/2. Keywords: Stress corrosion cracking; Incoloy-800 alloy; CANDU steam generator

Issue: 2014, Volume 65, Issue 7

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