Stress-dependent hardening-to-softening transition of hydrogen effects in nanoindentation of a linepipe steel |
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Authors: | Dong-Hyun Lee Jung-A Lee Moo-Young Seok Un Bong Baek Seung Hoon Nahm Jae-il Jang |
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Affiliation: | 1. Division of Materials Science and Engineering, Hanyang University, Seoul 133-791, South Korea;2. Division of Industrial Metrology, Korea Research Institute of Standards and Science, Daejeon 305-340, South Korea |
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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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Keywords: | Hydrogen Nanoindentation Hardness Linepipe steel |
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