학술논문
In-situ observation of hydrogen induced crack initiation in a nickel-based superalloy.
Document Type
Article
Source
Subject
*NICKEL alloys
*HEAT resistant alloys
*HYDROGEN
*FRACTURE mechanics
*SCANNING electron microscopy
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Language
ISSN
1359-6462
Abstract
Hydrogen induced crack initiation in a nickel-based superalloy was studied via in-situ Scanning Electron Microscopy observation under slow strain rate loading. Direct evidence has been obtained of crack initiation and propagation along dislocation slip bands leading to sample fracture. Post-mortem microstructural analysis showed that hydrogen induced cracking and separation along dislocation slip bands, which are along {111}γ crystallographic planes with the highest Schmid factor, leads to the formation of the typical slip-trace-like features on the quasi-cleavage surface. [ABSTRACT FROM AUTHOR]