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In the present study, detailed microstructure of the crack-tip region of a failed tube was examined using SEM, TEM and EBSD to clarify the relaxation crack mechanism. Details of the microstructural findings and a proposed mechanism of stress relief cracking will be discussed.
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In Jan 2023, during reformer shutdown; one of the reformer inspections revealed cracks at hot collector and pigtail. Most of the cracks were on the surface and some of the cracks were through. Pigtail sample was removed, and it was taken for failure investigation to confirm the failure root cause.