Page 352 - Failure Analysis Case Studies II
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Fig. 6. Crack tip morphology.
in Fig. 6. Thus, it ca b argued that the main cause for the form tion of cracks in the tube is
oxidation.
2.4. Chemical analysis
To investigate the cause of the severe oxidation, a chemical analysis was performed on tube
metal and oxide scale. Composition analysis was carried out both on the sound part of the tube
