Metallurgical Transactions A

, Volume 16, Issue 4, pp 641–649 | Cite as

Fatigue microcrack initiation in polycrystalline alpha-iron with polished and oxidized surfaces

  • C. V. Cooper
  • M. E. Fine


Plastic-strain-controlled fatigue crack initiation experiments were conducted on unoxidized and oxidized, vacuum-melted iron. In the unoxidized, as-polished condition at low plastic strain amplitudes, e.g., 1 or 5 X 10−4, microcracks initiated along well defined slip bands and in the troughs of surface rumples. Such microcracks tended to stop short of grain boundaries. On increasing the plastic strain amplitude, initiation of fatigue cracks along grain boundaries became important. When the specimens were surface oxidized, intergranular microcrack initiation was the dominant mode even at the plastic strain amplitude of 5 x 10−4, where transgranular microcracks formed only very infrequently and then only considerably later in the fatigue lifetime. At 1 x 10−3 amplitude, transgranular microcracks initiated very early in the cycling compared to the polished condition, but such cracks did not grow or increase in number. Intergranular cracks formed later and led to failure. Surface oxidation led to approximately a 20 pct reduction in lifetime to final failure.


Metallurgical Transaction Fatigue Crack Slip Band Wustite Fatigue Crack Initiation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    J.A. Ewing and J.C.W. Humfrey:Phil. Trans. Roy. Soc., 1903, vol. 200, p. 241.CrossRefGoogle Scholar
  2. 2.
    M. Klesnil and P. Lukas:J. Iron Steel Inst., London, 1965, vol. 203, p. 1043.Google Scholar
  3. 3.
    J. Watanabe and Y. Kumada:Trans. Soc. Mech. Eng., Tokyo, 1961, vol. 37, p. 67.Google Scholar
  4. 4.
    Y. H. Kim and M. E. Fine:Metall. Trans. A, 1982, vol. 13A, p. 59.Google Scholar
  5. 5.
    D. L. Anton and M. E. Fine:Mater. Sci. Eng., 1983, vol. 58, p. 135.CrossRefGoogle Scholar
  6. 6.
    D. Majumdar and Y. W. Chung:Metall. Trans. A, 1983, vol. 14A, p. 1421.Google Scholar
  7. 7.
    S. P. Bhat and R. S. Cline: Inland Steel Research Laboratories, E. Chicago, IN, unpublished research, 1983.Google Scholar
  8. 8.
    C. Y. Kung and M. E. Fine:Metall. Trans. A, 1979, vol. 10A, p. 603.Google Scholar
  9. 9.
    C. V. Cooper and M. E. Fine: inDefects, Fracture and Fatigue, G.C. Sih and J. W. Provan, eds., Martinus Nijhoff Publishers, The Hague, Netherlands, 1983, pp. 183–94.Google Scholar
  10. 10.
    M.E. Fine: inStrength of Metals and Alloys (ICSMA6), R.C. Gifkins, ed., Pergamon Press, 1982, vol. 2, pp. 833–38.Google Scholar
  11. 11.
    D. Majumdar and Y.-W. Chung:Scripta Metall., 1982, vol. 16, p. 791.CrossRefGoogle Scholar
  12. 12.
    D. Majumdar and Y.-W. Chung:Mater. Sci. Eng., 1984, vol. 67, p. 207.CrossRefGoogle Scholar
  13. 13.
    H. Mughrabi, F. Ackermann, and K. Herz: ASTM STP 675, 1979, p. 69.Google Scholar
  14. 14.
    U. Essmann, U. Gössele, and H. Mughrabi:Philos. Mag., 1981, vol. 44, p. 405.Google Scholar
  15. 15.
    H. Mughrabi, K. Herz, and X. Stark:Acta Metall., 1976, vol. 24, p. 659.CrossRefGoogle Scholar
  16. 16.
    C.V. Cooper: Ph.D. Thesis, Northwestern University, Evanston, IL, 1983.Google Scholar
  17. 17.
    R. von Mises:Z. Angew. Math. Mech., 1928, vol. 8, p. 161.CrossRefGoogle Scholar
  18. 18.
    R.F. Mehl and E.L. McCandless:Trans. AIME, 1937, vol. 125, p. 531.Google Scholar
  19. 19.
    F. C. Frank and J. H. van der Merwe:Proc. R. Soc. London, Ser. A, 1949, vol. A198, p. 216.Google Scholar
  20. 20.
    J. S. Vermaak and J. H. van der Merwe:Philos. Mag., 1964, vol. 10, p. 785.CrossRefGoogle Scholar

Copyright information

© The Minerals, Metals & Materials Society - ASM International - The Materials Information Society 1985

Authors and Affiliations

  • C. V. Cooper
    • 1
  • M. E. Fine
    • 2
  1. 1.United Technologies Research CenterEast Hartford
  2. 2.Department of Materials Science and Engineering and Materials Research CenterNorthwestern UniversityEvanston

Personalised recommendations