What is it about?

This paper investigates the influence of hydrogen on the candidate fracture toughness (KQ) of low carbon steel immersed in acidic hydrogen environments for one year which has limited previous research. Specimens were tested for crack tip opening displacement (CTOD) fracture toughness at six- and twelve-month intervals of immersion in acidic environments. Before KQ testing at various intervals, the hydrogen contents of the specimens were determined by an electrochemical approach. The synergistic activity of the HELP and HEDE mechanisms of hydrogen embrittlement in steel is confirmed.

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Why is it important?

Based on test results, models for the degradation of KQ of steel were developed in accordance with the proposed hydrogen-enhanced localized plasticity (HELP) and hydrogen-enhanced decohesion (HEDE) model (HELP + HEDE model) of hydrogen embrittlement. Furthermore, fractography of the specimens was performed to observe the synergistic action of HELP and HEDE mechanisms of hydrogen embrittlement (HE), and their subsequent effects on the microstructure and fracture resistance of steel.


The significance of the research is highlighted by its practical application for assessing the durability of steel structures and infrastructure against hydrogen environment-assisted cracking (HEAC). Furthermore, this paper highlights the synergistic activity of the HELP and HEDE mechanisms of hydrogen embrittlement in steel.

Professor Milos B. Djukic
University of Belgrade, Faculty of Mechanical Engineering

Read the Original

This page is a summary of: Influence of hydrogen-enhanced plasticity and decohesion mechanisms of hydrogen embrittlement on the fracture resistance of steel, Engineering Failure Analysis, February 2021, Elsevier,
DOI: 10.1016/j.engfailanal.2021.105312.
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