Synergistic action of hydrogen gas and weld defects on fracture toughness of X80 pipeline steel
Source abstract
Abstract
Abstract This study investigates the influence of hydrogen gas on the fatigue crack growth and fracture toughness of X80 welded metal. Tests are conducted in nitrogen and hydrogen environments. The results indicate that hydrogen increased the fatigue crack growth rate by an order of magnitude and reduced the Jm(12.7) (fracture toughness) of the base metal and weld metal. Jm(12.7) of the welded specimens decreased by 38.55% because of the hydrogen. The decrease in Jm(12.7) of the specimens with welding defects depended on the type of defects. The inside welding cracks began to grow because of hydrogen and stress. The fracture mode was brittle fracture which result in a 51.63% reduction in Jm(12.7). The inclusion Mn3TiSi governed the reduction in Jm(12.7) for specimens with inclusions, and hydrogen increased this reduction by 76.52%. Therefore, defects were the dominant factor for the decrease in fracture toughness, and hydrogen facilitated the failure of the material.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Hydrogen embrittlement and corrosion behaviors in metals · Fatigue and fracture mechanics · Material Properties and Failure Mechanisms
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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