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Stress-dependent hardening-to-softening transition of hydrogen effects in nanoindentation of a linepipe steel

Title
Stress-dependent hardening-to-softening transition of hydrogen effects in nanoindentation of a linepipe steel
Author
장재일
Keywords
Hydrogen; Nanoindentation; Hardness; Linepipe steel; AUSTENITIC STAINLESS-STEEL; MECHANICAL-PROPERTIES; INDENTER ANGLE; TITANIUM-ALLOY; DEFORMATION; EMBRITTLEMENT; LOAD; IRON; PLASTICITY; FRACTURE
Issue Date
2014-01
Publisher
PERGAMON-ELSEVIER SCIENCE LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
Citation
International Journal of Hydrogen Energy, Vol. 39, No. 4, 22 January 2014, Pages 1897-1902
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. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S0360319913027857http://hdl.handle.net/20.500.11754/47468
ISSN
0360-3199
DOI
10.1016/j.ijhydene.2013.11.060
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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