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Failure Analysis on 12.9 Grade Hex Head Bolt of Mine Car Brake
Pages: 55-57
Year: Issue:  4
Journal: Heat Treatment

Keyword:  SCM435 steelhydrogen contenthydrogen-assisted delayed cracking;
Abstract: The 12.9 grade hex head bolts,made of SCM435 steel,fractured after being installed and laid up for 42 h.The chemical composition analysis,macro-and micro-analysises of the fractured bolt were performed by using photoelectric direct-reading spectrograph,OM,SEM and hydrogen tester to reveal cause of the bolt fracture.The results show that the bolt fracture is a hydrogen-assisted delayed cracking.
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