Open AccessJournal Article
Failure Analysis on Fracture of 30CrMnSiNi2A Steel Bolt Used for Wing Cover Plate
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In this article, a 30CrMnSiNi2A steel bolt used for a wing cover plate which fractured huring storage after assembly was carried out by macro and micro observation of the fracture surface, microstructure inspection and hydrogen content test.Abstract:
Failure analysis on a 30CrMnSiNi2A steel bolt used for a wing cover plate which fractured huring storage after assembly was carried out by macro and micro observation of the fracture surface,microstructure inspection and hydrogen content test.The improvement measure was introduced.The results show that the failure mode of the bolt was hydrogen brittle fracture.The reason of hydrogen brittle fracture was the over-high material strength and hydrogen content.Decreasing the strength of the bolt to a proper level was a valid measure to prevent and control hydrogen brittle fracture of the high strength bolts based on the standard dehydrogenation process.read more
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Journal ArticleDOI
Manifestations in corrosion prophase of ultra-high strength steel 30CrMnSiNi2A in sodium chloride solutions
TL;DR: In this paper, the corrosion behavior of ultra-high strength steel 30CrMnSiNi2A in sodium chloride solution was studied by weight loss and electrochemical methods, and the morphology of corrosion products was observed using scanning electron microscopy (SEM) and the composition was analyzed using an energy dispersive spectroscopy (EDS) and X-Ray diffraction (XRD).
Proceedings ArticleDOI
Failure Analysis of Stainless Steel Bolt
Abstract: Two stainless steel bolts of the motor components assembly fractured after serving for eight hours. The fracture feature and cause of the bolt were analyzed by appearance observation, micro and macro observation on fracture surfaces, metallographic examination, hardness testing. The results show that the fracture mode of the bolts is hydrogen brittleness fracture. The high intensity and biggish assembly stress led to the hydrogen brittleness fracture of the bolt. Meanwhile, there is a lack of dehydrogenation disposal after inactivating technology in the entire technological process. It is proposed that the intensity should be in the range of criterion requirements, and the dehydrogenation disposal should be disposed after passivation technology according to standard. What's more, the assembly stress should be controlled strictly to avoid early stage damage of bolt.