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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of the sheets was (185Hv) which is higher than the value of solution annealing (160 HV). This may be attributed to the presence of few remaining shear bands related to the plate deformation. [8-9]. Table. 2. Chemical composition of the unused packing material. Sample C Si Mn P S Cr Mo Ni Cu Co 0.025 0.67 1.03 0.004 0.003 16.6 2.34 12.8 0.19 0.23

Fig. 1. As-received packing sheets having different colors as results of corrosion damages

Fig. 2. Close up views of the brown color sheet . (left) and black color sheet (right) showing the perforated attack the at stressed zones

Fig. 3. Optical microstructure at different points of the unused sheet showing austenitic grains with remaining of the shear bands (white wavy lines) resulted from deformation.

Fig. 4. Optical microstructure of black sheet showing severe intergranular corrosion started from the outer surface and detachment of grains