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Effect of Electrochemical Hydrogen Charging Time on Hydrogen Embrittlement of the Hot-Rolled and Accelerated Cooling Treated API X70 Steel

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Abstract

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

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Acknowledgements

This research was supported by Basic Science Research Capacity Enhancement Project through Korea Basic Science Institute (Core-facility for Converging Materials) Grant funded by the Ministry of Education (2019R1A6C1010045).

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Authors and Affiliations

  1. Division of Advanced Materials Engineering, Dong-Eui University, Busan, 47340, Republic of Korea

    Dong-Su Bae & Ilguk Jo

  2. Research Team of Material Compatibility To Hydrogen Facility, Korea Research Institute of Standards and Science (KRISS), Daejeon, 34113, Republic of Korea

    Un-Bong Baek & Seung-Hoon Nahm

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  1. Dong-Su Bae
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  2. Un-Bong Baek
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  3. Seung-Hoon Nahm
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  4. Ilguk Jo
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Correspondence to Dong-Su Bae or Ilguk Jo.

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Bae, DS., Baek, UB., Nahm, SH. et al. Effect of Electrochemical Hydrogen Charging Time on Hydrogen Embrittlement of the Hot-Rolled and Accelerated Cooling Treated API X70 Steel. Met. Mater. Int. 28, 466–474 (2022). https://doi.org/10.1007/s12540-021-01082-8

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