Materials Science

, Volume 37, Issue 6, pp 902–909

Cathodic-Polarization Effects on the Long/Short Corrosion-Fatigue Crack Growth Rate of an Offshore Steel

  • H. Hu
  • R. Akid
Article
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Abstract

We study the cyclic crack growth rate of an offshore steel. Compact specimens with long cracks and cylindrical specimens with short surface cracks were tested in air (at frequencies of 5–10 Hz) and in a 3.5% aqueous solution of NaCl (0.2 Hz). In the presence of cathodic polarization (−950 mV/SCE), the growth rate of long cracks is higher than under the conditions of free corrosion. The plateau appearing in this case in the da/dN–ΔK diagrams indicates the presence of hydrogen embrittlement. For ΔK > 10 MPa, the growth rates of short and long cracks coincide.

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References

  1. 1.
    ASTM Standard E399-81. Fatigue Precracking of K 1C Fracture Toughness Specimens. Google Scholar
  2. 2.
    J. E. Srawley, “Wide range stress intensity factor expressions for ASTM E399 standard fracture toughness specimens,” Int. J. Fract. Mech., 12, 475–476 (1976).Google Scholar
  3. 3.
    J. E. Newman, “Stress analysis of compact specimens including the effects of pin loading,” in: Fracture Analysis (8th Conf.), ASTM STP 560 (1974), pp. 105–121.Google Scholar
  4. 4.
    I. M. Austen, Quantitative Understanding of Corrosion Fatigue Crack Growth, BSC European Community Steel Commission Contract No. 7210 KE/806 Report, EUR 8560 EN (1983).Google Scholar
  5. 5.
    P. E. Irving and A. Kurzfeld, “Measurements of intergranular failure produced during fatigue crack growth in quenched and tempered steels,” Metal Sci., Nov., 495–502 (1978)Google Scholar
  6. 6.
    I. Y. Murakam, Stress Intensity Factors: A Handbook, Pergamon, Oxford (1987), pp. 654-656.Google Scholar
  7. 7.
    H. Nisitan and D. H. Chen, “Stress intensity factors for a semielliptic surface crack in a shaft under tension,” Trans. Japan Soc. Mech. Eng., 50, 1077–1082 (1984).Google Scholar

Copyright information

© Plenum Publishing Corporation 2001

Authors and Affiliations

  • H. Hu
  • R. Akid

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