Effect of grain boundary engineering on hydrogen embrittlement in Fe-Mn-C TWIP steel at various strain rates. (September 2018)

• Record Type: Journal Article
• Authors: Kwon, Young Jin; Seo, Hyun Joo; Kim, Jae Nam; Lee, Chong Soo
• Is Part Of: Corrosion science. Volume 142(2018)
• Page Start: 213
• Page End: 221
• Publication Date: 2018-09
• Subjects: Steel -- Hydrogen embrittlement -- Grain boundary engineering; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2018.07.028
• Languages: English
• ISSNs: 0010-938X

Abstract

Graphical abstract: Highlights: Hydrogen cracking increased with decreasing strain rate. Grain boundary engineering (GBE) promoted special boundaries. GBE provided some suppression of H-cracking at slow strain rates. Abstract: The influence of strain rate (10 −3 ≤ ε ˙ ≤ 10 −5 s −1 ) on hydrogen embrittlement behavior of Fe−17Mn − 0.8C (wt.%) TWIP steel was investigated. Two types of specimens were tested; one (AR) was hot-rolled, and the other (GBE) was further processed by grain boundary engineering. After hydrogen charging, the fracture strength (FS) and ductility of AR samples decreased as ε ˙ decreased, because increasing numbers of H atoms accumulated near crack tips. However, after hydrogen charging, the FS and tensile ductility of GBE samples were not decreased much even at low ε ˙, because special boundaries suppressed hydrogen-induced crack initiation and propagation.