Effect of hydrogen on the fracture toughness of X65 high-frequency welded pipeline

The effect of hydrogen on the fracture toughness of X65 high-frequency welded (HFW) pipelines was investigated both in a hydrogen environment and in air. The hydrogen environment was created by in situ hydrogen charging, using a simulated soil solution as the electrolyte. Four current densities were...

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Bibliographic Details
Published in:Welding in the world 2019-01, Vol.63 (1), p.75-86
Main Authors: Xu, L. Y., Kang, Z. Y., Han, Y. D., Zhao, L., Jing, H. Y., Zhu, W. F.
Format: Article
Language:English
Subjects:
Base metal
Chemistry and Materials Science
Crack opening displacement
Crack tips
Current density
Electron backscatter diffraction
Fracture toughness
Heat treating
Hydrogen
Hydrogen charging
Hydrogen permeation
Materials Science
Metallic Materials
Research Paper
Solid Mechanics
Theoretical and Applied Mechanics
Weld metal
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Summary:The effect of hydrogen on the fracture toughness of X65 high-frequency welded (HFW) pipelines was investigated both in a hydrogen environment and in air. The hydrogen environment was created by in situ hydrogen charging, using a simulated soil solution as the electrolyte. Four current densities were used, namely 1, 2, 4, and 8 mA/cm 2 . The fracture toughness was characterized by the crack tip opening displacement (CTOD). The CTOD values of the base metal and weld metal decreased with increasing hydrogen charging current density, and a higher reduction was seen in the weld metal. In addition, the hydrogen permeation and electron backscattered diffraction (EBSD) measurements were also applied to the base metal and weld metal to evaluate the hydrogen-induced cracking (HIC) susceptibility. The results showed that the weld metal had a higher HIC susceptibility than that of the base metal.
ISSN:0043-2288
1878-6669
DOI:10.1007/s40194-018-0669-4