Influence Of Fatigue Pre-Loading Level On Hydrogen-Assisted Micro-Damage In Eutectoid Steel

  1. Toribio Quevedo, Jesús Andrés 1
  2. Lorenzo Fernández, Miguel Ángel 2
  3. Vergara, Diego 2
  1. 1 Department of Materials Engineering University of Salamanca
  2. 2 Department of Mechanical Engineering University of Salamanca
Revista:
CORROSIÓN 2010, San Antonio,

Any de publicació: 2010

Tipus: Artícle de dades

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Resum

A fracture mechanics approach to hydrogen-assisted micro-damage in eutectoid steel is presented. Fractographic analysis revealed micromechanical effects of hydrogen in the form of tearing topography surface (TTS). The progress of this micro-damage is modeled as a macroscopic crack that extends the original fatigue pre-crack and involves linear elastic fracture mechanics principles. In this case, the change from hydrogen-assisted micro-damage (TTS) to cleavage-like topography takes place when a critical stress intensity factor (KH) is reached, and this value depends on the amount of hydrogen which penetrated the vicinity of the actual crack tip (the fatigue pre-crack plus the TTS area). The present study analyzes the effect of the TTS zone aspect ratio on KH.