4.7 Article

Restoration of ductility in hydrogen embrittled dual-phase (DP 780) steel by the electric pulse treatment

出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2022.143256

关键词

Hydrogen embrittlement; Centerline crack; Electric pulse treatment; Damage recovery; Dual-phase steel

资金

  1. Science & Engineering Research Board (SERB) , Department of Science Technology [ECR/2017/001898]
  2. Government of India

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In this study, hydrogen-induced damage and ductility in high-strength steel were effectively restored using electric pulse treatment. The experimental results show that suitable electropulsing parameters can fully restore ductility and repair hydrogen-induced damage.
High-strength steel components operating in a hydrogen environment are more susceptible to hydrogen embrittlement. De-hydrogenation of these components could prolong their service life, encouraging the industrial use of high-strength steel. In this study, hydrogen (H)-induced damage recovery and restoration of ductility are realized in dual-phase (DP 780) steel by the electric pulse treatment (EPT). The experimental results indicate that a complete restoration of ductility and H-induced damage recovery could be achieved with suitable electropulsing parameters in DP 780 steel. A centerline crack is observed in the fractographic examination of each hydrogenated specimen after the uniaxial tensile test. After EPT, post-necking ductility improves, and the centerline crack disappears from the fractured surface. The in-situ digital image correlation (DIC) technique is utilized during the uniaxial tensile test to measure the local strain evolution. Both uniaxial tensile necking and fracture strains are restored after EPT of hydrogenated specimens.

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