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Influence of casting technique and hot isostatic pressing on the fatigue of an Al-7Si-Mg alloy

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Abstract

The influence of the casting filling technique and hot isostatic pressing (hipping) on the fatigue-life distribution of Al-7Si-Mg alloy castings has been studied. To vary the number density and size of oxide-film defects in the castings, test bars were cast using bottom-gated filling systems with and without filtration. Some unfiltered castings were subjected to a hipping treatment of 100 MPa at 500 °C for 6 hours. Test pieces were machined from the castings and were fatigue tested in pull-pull sinusoidal loading, at maximum stresses of 150 and 240 MPa under a stress ratio of R=+0.1. The fatigue lives at any probability of failure and Weibull statistical parameters of the filtered castings were higher than those of the unfiltered and nonhipped castings, illustrating the importance of the casting technique. However, the unfiltered but hipped castings exhibited higher performance. It is proposed that the significant improvement in fatigue life after hipping is due to the deactivation of entrained double oxide-film defects as fatigue-crack initiators.

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Authors and Affiliations

  1. the Department of Mechanical Engineering, the University of Dar-es-Salaam, Dar-es-Salaam, Tanzania

    C. Nayhumwa (Lecturer)

  2. Cosworth Technology Ltd., Worcester, United Kingdom

    N. R. Green

  3. School of Metallurgy and Materials, and IRC in Materials, England

    J. Campbell (Technical Manager Professor)

  4. the University of Birmingham, B15 2TT, Birmingham, England

    J. Campbell (Technical Manager Professor)

Authors
  1. C. Nayhumwa
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  2. N. R. Green
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  3. J. Campbell
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Nayhumwa, C., Green, N.R. & Campbell, J. Influence of casting technique and hot isostatic pressing on the fatigue of an Al-7Si-Mg alloy. Metall Mater Trans A 32, 349–358 (2001). https://doi.org/10.1007/s11661-001-0266-8

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  • DOI: https://doi.org/10.1007/s11661-001-0266-8

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