Metallurgical and Materials Transactions B

, Volume 3, Issue 11, pp 3025–3031 | Cite as

Microcracks associated with inclusions in as-cast iron and their role during fracture

  • W. E. Brower
  • S. N. Singh
Mechanical Behaviour


The formation of voids and microcracks in and around FeO and SiO2 inclusions during the solidification of pure iron has been investigated and their role during fracture studied. The sizes of these inclusions were varied by an order of magnitude by control of the solidification rate. Voids and microcracks were associated with large (~4 μ) as well as with fine (~0.1 μ) FeO inclusions but not with SiO2 inclusions. The formation of voids is explained on the basis of solidification shrinkage and the freezing characteristics of FeO. The occurrences of microcracks in the inclusions is explained on the basis of stresses developed due to differential thermal contraction of inclusions and the surrounding matrix during cooling. The effect of these microcracks on the fracture behavior of inclusion-bearing iron is briefly described.


Fracture Surface Interface Crack Pure Iron Metallurgical Transaction Volume Fine Inclusion 
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  1. 1.
    C. T. Liu and J. Gurland:Trans. ASM, 1968, vol. 61, pp. 156–67.Google Scholar
  2. 2.
    S. N. Singh and M. C. Flemings:Trans. TUS-AIME, 1969, vol. 245, pp. 1811–19.Google Scholar
  3. 3.
    F.B. Pickering:Iron Steel Inst., June 1958, vol. 189, pp. 148–59.Google Scholar
  4. 4.
    A.R. Rosenfield:Met. Rev., 1968, vol. 121, pp. 29–40.CrossRefGoogle Scholar
  5. 5.
    W.A. Backofen:Fracture of Engineering Materials, p. 107, ASM, Metal Parks, Ohio, 1964.Google Scholar
  6. 6.
    M. Gell and G. R. Leverant:Trans. TMS-AIME, 1968, vol. 242, pp. 1869–79.Google Scholar
  7. 7.
    D. Brooksband and K. W. Andrews:J. Iron SteelInst., 1968, vol. 206, pp. 595–99.Google Scholar
  8. 8.
    W. E. Brower, R. W. Strachan, and M. C. Flemings:Cast Metals ResearchJournal, December 1970, vol. 6, no. 4, pp. 176–80.Google Scholar
  9. 9.
    W. E. Brower, S. N. Singh, and M. C. Flemings:J. Basic Eng., 1971, vol. 93, series D, no.l,p. 90.CrossRefGoogle Scholar
  10. 10.
    V. A. Tipnis and N. H. Cook:J. Basic Eng., 1967, vol. 89, series D, no. 3, pp. 533–40.CrossRefGoogle Scholar

Copyright information

© The Metallurgical of Society of AIME 1972

Authors and Affiliations

  • W. E. Brower
    • 1
  • S. N. Singh
    • 2
  1. 1.Mechanical Engineering DepartmentDuke UniversityDurham
  2. 2.Process Metallurgy Development DivisionU. S. Steel Corporation, Research LaboratoryMonroeville

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