Skip to main content
SpringerLink
Log in

Dislocation structures around propagating fatigue cracks in iron

  • Machanical Behavior
  • Published:
Metallurgical Transactions A Aims and scope Submit manuscript

Abstract

Dislocation structures around the fatigue cracks for known stress intensity factor ranges were observed through an electron microscope operating at 2000 kV. To prepare thin foils for this purpose, a jet electropolishing technique has been developed, and regions in the vicinity of crack tips, as close as 0.1 μm from the sides, could be preserved in these foils. There were found 1) in front of the crack tip, substructures characterized by considerably dense dislocations in the cells just ahead of the tip and the formation of a lot of cells elongated in one direction, and 2) in the vicinity of the crack sides, a very fine cell structure with the interior of the cells showing relatively low density of dislocations. Besides cracks growing along the boundaries of cells or grains, some cracks penetrating into cells were observed. However, any crack supposed to be formed by linking of voids was not found. The misorientation between adjacent cells formed near the crack was generally a few minutes of arc, but the value as high as about 10° was sometimes observed immediately ahead of the crack tips. From the difference between the structures ahead of the tip and those in the vicinity of the sides, a brief discussion is made about structural changes produced when the crack tip has passed.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  1. L.E. Murr and P. J.Smith:Trans. TMS-AIME, 1965, vol. 233, pp. 755–61.

    CAS  Google Scholar 

  2. J. C. Grosskreutz and G. G. Shaw:6th International Congress Electron Mi- croscopy (Kyoto), pp. 331-32, 1966.

  3. G. G. Shaw:6th International Congress Electron Microscopy (Kyoto), pp. 325-26,1966.

  4. S. Karashima, H. Oikawa, and T. Ogura:Trans. Jap. Inst. Metals, 1968, vol. 9, pp. 205–13.

    Article  Google Scholar 

  5. P. Lukas, M. Klesnil, and R. Fiedler:Phil. Mag, 1969, vol. 20, pp. 799–805.

    Article  CAS  Google Scholar 

  6. M. Klesnil and P. Lukas: Fract., Proc. 2nd Int. Cong. Fracture, Brighton, 1969, pp. 725-30.

  7. A. H. Purcell and J. Weertman:Met. Trans., 1973, vol. 4, pp. 349–53.

    Article  CAS  Google Scholar 

  8. A. H. Purcell and i. Weertman:Met. Trans., 1974, vol. 5, pp. 1805–09.

    Article  CAS  Google Scholar 

  9. T. Ogura and S. Karashima:Trans. Jap. Inst. Metals, 1974, vol. 15, pp. 325–30.

    Article  Google Scholar 

  10. M.A. Wilkins and G.C. SmithActa Met., 1970, vol. 18, pp. 1035–3.

    Article  CAS  Google Scholar 

  11. J. C. Grosskreutz and G. G. Shaw:ActaMet., 1972, vol. 20, pp. 523–28.

    CAS  Google Scholar 

  12. J. Awatani, K. Katagiri, and T. Shiraishi:Met. Trans. A, 1976, vol. 7A, pp. 807–10.

    Article  CAS  Google Scholar 

  13. J. Awatani and T. Shiraishi:Met. Trans. A, 1976, vol. 7A, pp. 1599–1601.

    Article  CAS  Google Scholar 

  14. J. Awatani, K. Katagiri, and T. Shiraishi:J. Soc. Mater. Sci. Japan, 1976, vol 25, pp. 145–50.

    Article  CAS  Google Scholar 

  15. G. C. Sih:Handbook of Stress-Intensity Factors, 1-4.2-5, Lehigh University, Pennsylvania, 1973.

    Google Scholar 

  16. J. Holden:Phil. Mag., 1961, vol. 6, pp. 547–58.

    Article  CAS  Google Scholar 

  17. D. H. Avery and W. A. Backofen:Fract. of Solids, pp. 339–82, Interscience Publisher, New York, 1962.

    Google Scholar 

  18. J.C. Grosskreutz and P. Waldow:Acta Met., 1963, vol. 11, pp. 717–24.

    Article  Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Institute of Scientific and Industrial Research, Osaka University, Yamada-kami, Suita, Osaka, Japan

    Jobu Awatani (Professor), Kazumune Katagiri (Assistant Professor) & Hiroshi Nakai (Graduate Student)

Authors
  1. Jobu Awatani
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. Kazumune Katagiri
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. Hiroshi Nakai
    View author publications

    You can also search for this author in PubMed Google Scholar

Rights and permissions

Reprints and permissions

About this article

Cite this article

Awatani, J., Katagiri, K. & Nakai, H. Dislocation structures around propagating fatigue cracks in iron. Metall Trans A 9, 111–116 (1978). https://doi.org/10.1007/BF02647179

Download citation

  • Received:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF02647179

Keywords

Search

Navigation