On the failure of surface damage to assess the hydrogen-enhanced deformation ahead of crack tip in a cyclically loaded austenitic stainless steel. (June 2019)

• Record Type: Journal Article
• Authors: Wang, Shuai; Nygren, Kelly E.; Nagao, Akihide; Sofronis, Petros; Robertson, Ian M.
• Is Part Of: Scripta materialia. Number 166(2019)
• Page Start: 102
• Page End: 106
• Publication Date: 2019-06
• Subjects: 316L austenitic stainless steel -- Hydrogen embrittlement -- Fatigue -- Cyclic plastic zone -- Transmission electron microscopy; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2019.03.010
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: The influence of internal hydrogen on the plastic deformation ahead of a crack tip in a cyclically loaded austenitic stainless steel was determined through examination of the surface slip steps and dislocation structure. The slip steps failed to capture the totality of the sub-surface plasticity, causing the dimensions of the plastic zone generated in the presence of hydrogen to be underestimated. Regions in the hydrogen-charged steel that displayed no slip steps exhibited a similar dislocation structure to regions with slip steps in the uncharged steel. These observations are attributed to hydrogen-accelerating deformation processes and the rate of microstructure evolution. Graphical abstract: Unlabelled Image