Stress-dependent hardening-to-softening transition of hydrogen effects in nanoindentation of a linepipe steel
- Authors
- Lee, Dong-Hyun; Lee, Jung-A; Seok, Moo-Young; Baek, Un Bong; Nahm, Seung Hoon; Jang, Jae-il
- Issue Date
- Jan-2014
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Hydrogen; Nanoindentation; Hardness; Linepipe steel
- Citation
- INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, v.39, no.4, pp.1897 - 1902
- Indexed
- SCIE
SCOPUS
- Journal Title
- INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
- Volume
- 39
- Number
- 4
- Start Page
- 1897
- End Page
- 1902
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/160962
- DOI
- 10.1016/j.ijhydene.2013.11.060
- ISSN
- 0360-3199
- Abstract
- We explored the influences of hydrogen on small-scale strength of a linepipe steel through nanoindentation experiments with four pyramidal indenters. Interestingly, a transition from hydrogen-induced hardening to softening was observed as indenter sharpness increases. The transition was analyzed based on the enhancement in hydrogen's elastic shielding effects for a sharper indenter, which could be indirectly evidenced by the stress effects on indentation pile-up, dislocation density, and rate dependency of hardness.
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