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Fatigue crack growth behaviors in Al−Si−Mg sand cast alloys

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Abstract

The fatigue crack growth behavior of Al−Si−Mg sand cast alloys has been investigated with reference to the effects of solidification structure and aging condition. Fatigue crack growth tests have been carried out under constant load amplitude and a stress ratio of R=0.1 using CT specimens. The amount of pores in the matrix was limited by performing HIP treatment. The pores tended to promote deflection of fatigue cracks, which decreased the fatigue crack growth rate at low ΔK regions and increased the number of cycles until final fatigue fracture. Refining and spheroidizing of eutectic Si particles increased the fatigue crack growth rates over a wide range of ΔK up to larger ΔK values. The difference of aging conditions significantly affected the da/dN-ΔKeff relationship.

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  1. Division of Advanced Materials Engineering Research Institute of Advanced Materials Development, Chonbuk National University, 644-14 Deokjin-dong 1-ga, Deokjin-gu, 561-756, Cheonju, Korea

    Sang-Won Han & Sug-Won Kim

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  1. Sang-Won Han
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  2. Sug-Won Kim
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Correspondence to Sug-Won Kim.

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Han, SW., Kim, SW. Fatigue crack growth behaviors in Al−Si−Mg sand cast alloys. Met. Mater. Int. 10, 13–18 (2004). https://doi.org/10.1007/BF03027358

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