PSI - Issue 60

Sarath Chandran Nair S. et al. / Procedia Structural Integrity 60 (2024) 564–574 Sarath Chandran Nair S. / Structural Integrity Procedia 00 (2023) 000 – 000

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Fig. 8. Cracks seen on Nickel coating during DP test

100 120 140 160 180

Stress, N/mm 2

0 20 40 60 80

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

Strain, %

Fig. 9. Stress-strain curve obtained for Nickel coated specimen for 1.2% strain testing

Observation of Nickel and Chromium coated specimen subjected to tensile and compressive strain are shown in fig. 10. Cracks observed at different locations on the coating especially in the gauge length portion in visual inspection with magnifying glass. Cracks seen in dye penetrant test also. In the subsequent tests, new cracks seen in different locations in visual inspection and dye penetrant test. But no coating peeling observed. (a) Tensile strain testing (b) Compressive strain testing

After strain cycling test at Room Temperature

After strain cycling test at Room Temperature

After heating and cooling without loading

After heating and cooling without loading

After 3 cycles of strain cycling test at 790K

After 3 cycles of strain cycling test at 820K