Hydrogen embrittlement through the formation of low-energy dislocation nanostructures in nanoprecipitation-strengthened steels

Gong, P. and Nutter, J. and Rivera-Diaz-Del-Castillo, P. E.J. and Rainforth, W. M. (2020) Hydrogen embrittlement through the formation of low-energy dislocation nanostructures in nanoprecipitation-strengthened steels. Science Advances, 6 (46). ISSN 2375-2548

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Abstract

Hydrogen embrittlement is shown to proceed through a previously unidentified mechanism. Upon ingress to the microstructure, hydrogen promotes the formation of low-energy dislocation nanostructures. These are characterized by cell patterns whose misorientation increases with strain, which concomitantly attracts further hydrogen up to a critical amount inducing failure. The appearance of the failure zone resembles the "fish eye"associated to inclusions as stress concentrators, a commonly accepted cause for failure. It is shown that the actual crack initiation is the dislocation nanostructure and its associated strain partitioning.

Item Type:
Journal Article
Journal or Publication Title:
Science Advances
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1000
Subjects:
ID Code:
153178
Deposited By:
Deposited On:
26 Mar 2021 09:34
Refereed?:
Yes
Published?:
Published
Last Modified:
09 Jun 2021 05:53