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Oxide films, pores and the fatigue lives of cast aluminum alloys

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Abstract

In the absence of gross defects such as cold shuts, the fatigue properties of castings are largely determined by the sizes of microstructural defects, particularly pores and oxide films. In contrast, the effects of grain size, second-phase particles, and nonmetallic inclusions are insignificant. The authors review the fatigue properties of castings made by gravity die casting, sand casting, lost-foam casting, squeeze casting, and semisolid casting, and compare A356/357 alloys with 319-type alloys. The application of fracture mechanics enables the properties to be rationalized in terms of the defects that are characteristic of each casting process, noting both the sizes and types of defect. The differences in the properties of castings are entirely attributed to their different defect populations. No single process is inherently superior. For defects of the same size (in terms of projected area normal to the loading direction), oxide films are less detrimental to fatigue life than pores. Areas of current controversy are highlighted and suggestions for further work are made.

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Authors and Affiliations

  1. GM Powertrain Engineering, 48340, Pontiac, MI

    Q. G. Wang (Senior Materials Engineer) & P. N. Crepeau (Staff Materials Engineer)

  2. CSIRO Manufacturing and Infrastructure Technology, 4069, Kenmore, Australia

    C. J. Davidson (Principal Research Scientist) & J. R. Griffiths (Senior Principal Research Scientist)

Authors
  1. Q. G. Wang
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  2. P. N. Crepeau
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  3. C. J. Davidson
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  4. J. R. Griffiths
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Correspondence to Q. G. Wang.

Additional information

This article is based on a presentation made in the John Campbell Symposium on Shape Casting, held during the TMS Annual Meeting, February 13–17, 2005, in San Francisco, CA.

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Wang, Q.G., Crepeau, P.N., Davidson, C.J. et al. Oxide films, pores and the fatigue lives of cast aluminum alloys. Metall Mater Trans B 37, 887–895 (2006). https://doi.org/10.1007/BF02735010

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