Effect of the Electro-Chemical Hydrogen Charging Time on Hydrogen Embrittlement of X70 Steel Using for Gas Pipeline

Sung, Chi-Eun; Jeon, Hyeon-Jee; Lee, Jin-Kyung; Son, In-Soo; Lee, Sang-Pill; Lee, Seok-Cheol; Baek, Un Bong; Nahm, Seung Hoon

doi:10.3365/kjmm.2013.51.11.813

Cited by 1 publication

(4 citation statements)

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“…2b, when the part constituting the band structure is observed with a scanning microscope, it can be seen that relatively coarse pearlite and fine AF are mixed together with PF. It can be seen that this microstructure is similar to previously reported microstructures [4,6,15,16]. 3 The stress-strain curves of the hot rolled and accelerated cooling treated API X70 steel held 0 h, 2 h, 4 h, and 10 h within electrolyte pot during electrochemical hydrogen charging method Fig.…”

Section: Primary Microstructuresupporting

confidence: 85%

“…9a and 10a. It is formed to lead to brittle fracture, which shows similar results to the brittle fracture characteristics in which secondary cracks are formed observed in the tensile fracture surface of API X80 and API X70 steel due to hydrogen embrittlement [10,11,15].…”

Section: External Shape Of the Tensile-tested Specimenssupporting

confidence: 61%

“…11b-d are very small, and the degree is very small and about 45° with respect to the tensile direction on the outside. Since cracks are formed in the angular and vertical directions, that is, in the circumferential direction [11,15], it can be seen that shear fracture and brittle fracture occur without large elongation in the shape of the fracture.…”

Section: External Shape Of the Tensile-tested Specimensmentioning

confidence: 99%

“…Researchers have studied the hydrogen embrittlement of API linepipe steel and a test method to investigate the hydrogen embrittlement behavior [8][9][10][11][12][13], and also there are several research data on the effect of hydrogen content on the fracture behavior of API X70 steel [4][5][6][7][8][9][14][15][16][17]. In South Korea, POSCO (Pohang Steel Company) and Dongkuk Steel produce a certain amount of API X70 steel, but a few research papers on hydrogen embrittlement of API X70 steel using electrochemical hydrogen charging method were published worldwide [15,17].…”

Section: Introductionmentioning

confidence: 99%

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

Baek

Nahm

2021

Met. Mater. Int.

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This study investigated the effect of the hydrogen charging time on the hydrogen embrittlement of hot-rolled and acceleratedcooling 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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Section: Primary Microstructuresupporting

confidence: 85%

Section: External Shape Of the Tensile-tested Specimenssupporting

confidence: 61%

Section: External Shape Of the Tensile-tested Specimensmentioning

confidence: 99%