In view of the fracture of the external threaded joint of the by-pass valve shell of the Ф172 mm screw drilling tool produced by a company,macro analysis,physical and chemical inspection and micro-fracture analysis were conducted.It was found that the main reason for the fracture of the external threaded joint was due to hydrogen infiltrating into the metal during the electroplating process to form hydrogen induced cracking,followed by brittle cleavage fracture.
threaded jointmicroscopic analysis of fractureelectroplatehydrogen induced crackingbrittle cleavage fracture
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