PSI - Issue 13

M. Newishy et al. / Procedia Structural Integrity 13 (2018) 353–360 M. Newishy / Structural Integrity Procedia 00 (2018) 000–000

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Fig. 6. SEM of the corroded black sheet showing coarse austenitic grains with shear bands and inter granular cracks.

Fig. 7. SEM-EDS spot analysis of the black corroded packing.

According to the results obtained, failure of these sheets could be mainly attributed to intergranular chloride stress corrosion cracking (CLSCC). Most studies indicated that cold deformation produces a harmful effect on the corrosion resistance of the material. [8,9,15,17] The accepted mechanism explains the deterioration effect of shear bands or cold deformation on corrosion is related to additional energy. It leads in consequences to decreasing the thermodynamic durability of the material. The occurrence of (CLSCC) depends mainly on three factors: susceptibility of the material, environment and considerable residual stresses.