In-situ observation of hydrogen induced crack initiation in a nickel-based superalloy. (November 2017)

• Record Type: Journal Article
• Authors: Zhang, Zhenbo; Obasi, Gideon; Morana, Roberto; Preuss, Michael
• Is Part Of: Scripta materialia. Number 140(2017)
• Page Start: 40
• Page End: 44
• Publication Date: 2017-11
• Subjects: Nickel-based superalloy -- Hydrogen embrittlement -- Crack initiation -- In-situ loading -- Dislocation slip band; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2017.07.006
• Languages: English
• ISSNs: 1359-6462

Abstract

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. Graphical abstract: In-situ loading under SEM observation shows H-induced crack initiates along dislocation slip bands with highest Schmid factor.