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.
关键词
螺纹接头/断口微观分析/电镀/氢致开裂/脆性解理断裂
Key words
threaded joint/microscopic analysis of fracture/electroplate/hydrogen induced cracking/brittle cleavage fracture
维普
万方数据