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Published in:
2023 | OriginalPaper | Chapter
11. Delayed Fracture After Long Exposure in Atmospheric Environments
Author : Michihiko Nagumo
Published in: Fundamentals of Hydrogen Embrittlement
Publisher: Springer Nature Singapore
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Abstract
The first exhibited details of the cracking process in delayed fracture of a high-strength steel bolt after long atmospheric exposure is presented as the conclusive chapter. The formation of frail zone beneath the thread root with multiple crack nucleation and the crack propagation associated with alterations of fractographic features from there are shown. Energetically peculiar situations as fracture event are noticed. The findings are in accord with the experimental and theoretical results of the hydrogen-enhanced strain-induced generation of vacancies. A method is proposed to assess the intrinsic susceptibility to delayed fracture of steel.