What is it about?
Previous research has indicated that hydrogen decreases the fracture toughness of gas transmission pipeline steels. This study produced two values of fracture toughness for the X65 steel in the Dampier Bunbury natural gas pipeline in air and two essentially ASTM-valid values of fracture toughness for X65 subjected to in-situ hydrogen charging thought to be equivalent to a hydrogen gas pressure of 200 bar.
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Why is it important?
The fracture toughness for hydrogen-charged specimens was lower than in air. The large spread of the fracture toughness in air was attributable to the fact that these JQ values were dependent on testing details. The spread of fracture toughness values in hydrogen was attributed to the variability of fracture toughness in hydrogen under these hydrogen charging conditions.
Perspectives
There was considerable stable crack growth. The energy for stable crack growth increased with crack length. The fractography in the presence of hydrogen showed significant ductility, consistent with hydrogen-assisted plastic fracture. The values of fracture toughness in air and with hydrogen were consistent with literature values.
Professor Milos B. Djukic
University of Belgrade, Faculty of Mechanical Engineering
Read the Original
This page is a summary of: Preliminary Evaluation of the Influence of Hydrogen on the Fracture Toughness of a X65 Gas Transmission Pipeline Steel, Advanced Engineering Materials, May 2024, Wiley,
DOI: 10.1002/adem.202400352.
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