Effect of Anodic Dissolution and Hydrogen Absorption on Plastic Zone at Fatigue Crack Tip in Structural Steel

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  • Wang Z. F.
    Division of Engineering, Brown University State Key Laboratory of Corrosion Science, Institute of Corrosion and Protection of Metals
  • Briant C. L.
    Division of Engineering, Brown University
  • Kumar K. S.
    Division of Engineering, Brown University
  • Wei X. J.
    State Key Laboratory of Corrosion Science, Institute of Corrosion and Protection of Metals
  • Li J.
    State Key Laboratory of Corrosion Science, Institute of Corrosion and Protection of Metals
  • Ke W.
    State Key Laboratory of Corrosion Science, Institute of Corrosion and Protection of Metals

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  • Effect of Anodic Dissolution and Hydrog

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Abstract

The anodic dissolution and hydrogen absorption for A537 steel in 3.5% NaCl solution, as studied by speckle interferometry, occur simultaneously at the fatigue crack tip. However, the degree of anodic dissolution and hydrogen embrittlement vary with applied potential. The anodic dissolution of the steel increases the plastic zone size at the crack tip, while the absorption of hydrogen into steel decreases the plastic zone size at the crack tip. In fact, the size of the plastic zone at the crack tip is determined by the competition of the above two processes, i.e., the size of the plastic zone at the crack tip will decrease if hydrogen absorption plays a dominant role, and will increase if anodic dissolution plays a dominant role.

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