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논문 기본 정보

자료유형
학술저널
저자정보
Dong‑Su Bae (Dong-Eui University) Un‑Bong Baek (Korea Research Institute of Standards and Science (KRISS)) Seung‑Hoon Nahm (Korea Research Institute of Standards and Science (KRISS)) Ilguk Jo (Dong-Eui University)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International 제27권 제2호
발행연도
2022.2
수록면
466 - 474 (9page)
DOI
10.1007/s12540-021-01082-8

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This study investigated the effect of the hydrogen charging time on the hydrogen embrittlement of hot-rolled and acceleratedcoolingtreated API X70 steel by using the electrochemical hydrogen charging method. Tensile and V-notch Charpy impacttest were completed for the specimens of hydrogen charged for 0, 2, 4, and 10 h, and then microstructural observation wereperformed. The tensile and yield strength tended to decrease slightly and the total elongation started to decrease rapidly up to2 h charging time and then these gradually decreased with the hydrogen charging time. The post-uniform elongation increasedslightly after the holding time of 2 h due to the occurrence of two-step stress reduction phenomenon and its mechanismhas suggested. The effect of the hydrogen embrittlement on impact absorption energy according to the hydrogen chargingtime were also investigated. The fracture surface of the hydrogen charged ones are generally composed of cleavage fracturesurfaces. It was demonstrated that the external cracks were formed on the outside of tensile tested specimen and the externalshape of the fracture portion was fractured without large elongation at hydrogen charged specimens.

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