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Fatigue performance of a cast aluminium alloy Al-7Si-Mg with surface defects

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Abstract

Fatigue performance has been studied in a cast Al-7Si-Mg alloy with regard to various casting defects, particularly surface or subsurface defects. Fatigue tests were carried out under four-point bending to investigate the stress-life relationship and fatigue fracture characteristics in order to understand crack initiation and growth behaviour in conjunction with the examination of surface roughness and porosity. Surface hollows were found to control crack initiation of as-cast specimens. The fracture surfaces of polished specimens revealed that surface or subsurface shrinkage pores replaced the hollows to act as crack initiators when the rough surface was removed. The importance of oxide films in crack initiation was also demonstrated. The effects of all these casting defects on fatigue life are discussed.

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Authors and Affiliations

  1. School of Metallurgy and Materials,, The University of Birmingham,, Edgbaston, Birmingham, B15 2TT,, U.K.

    H. Jiang, P. Bowen & J. F. Knott

Authors
  1. H. Jiang
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  2. P. Bowen
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  3. J. F. Knott
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Jiang, H., Bowen, P. & Knott, J.F. Fatigue performance of a cast aluminium alloy Al-7Si-Mg with surface defects. Journal of Materials Science 34, 719–725 (1999). https://doi.org/10.1023/A:1004560510632

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