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Metallurgical and Materials Transactions B

, Volume 37, Issue 6, pp 887–895 | Cite as

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

  • Q. G. WangEmail author
  • P. N. Crepeau
  • C. J. Davidson
  • J. R. Griffiths
Article

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.

Keywords

Fatigue Material Transaction Fatigue Crack Fatigue Life Fatigue Strength 
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.

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Copyright information

© The Minerals, Metals & Materials Society - ASM International - The Materials Information Society 2006

Authors and Affiliations

  • Q. G. Wang
    • 1
    Email author
  • P. N. Crepeau
    • 1
  • C. J. Davidson
    • 2
  • J. R. Griffiths
    • 2
  1. 1.GM Powertrain EngineeringPontiac
  2. 2.CSIRO Manufacturing and Infrastructure TechnologyKenmoreAustralia

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