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<p>This work systematically investigated the hydrogen embrittlement (HE) behaviors of different areas in welded pipeline steel, including the base metal (BM), weld metal (WM), and heat-affected zone (HAZ), under gaseous hydrogen conditions. Additionally, the HE susceptibility of specimens machined from these areas was quantitatively evaluated and compared based on the HE susceptibility index (HEI). Furthermore, the relationship between HE susceptibility in different regions and their respective microstructural characteristics was thoroughly analyzed. The findings revealed that the WM exhibited the highest susceptibility to HE. Following fracture, the specimen surfaces displayed extensive primary cracks accompanied by numerous secondary cracks, providing strong evidence in support of this conclusion. In contrast, the BM demonstrated the lowest susceptibility, with minimal morphological changes observed.</p>

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Evaluation of hydrogen embrittlement susceptibility differences among the weld, heat-affected zone, and base metal in welded pipeline steel

  • 期刊论文

  • 发表日期：

    2025年12月14日

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  • Huyue Wang,
  • Hongliang Ming,
  • Jianqiu Wang

摘要

This work systematically investigated the hydrogen embrittlement (HE) behaviors of different areas in welded pipeline steel, including the base metal (BM), weld metal (WM), and heat-affected zone (HAZ), under gaseous hydrogen conditions. Additionally, the HE susceptibility of specimens machined from these areas was quantitatively evaluated and compared based on the HE susceptibility index (HEI). Furthermore, the relationship between HE susceptibility in different regions and their respective microstructural characteristics was thoroughly analyzed. The findings revealed that the WM exhibited the highest susceptibility to HE. Following fracture, the specimen surfaces displayed extensive primary cracks accompanied by numerous secondary cracks, providing strong evidence in support of this conclusion. In contrast, the BM demonstrated the lowest susceptibility, with minimal morphological changes observed.