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Effect of casting conditions on fracture strength of Al-5 alloy

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Document pages: 8 pages

Abstract: During the transient phase of filling in the casting operation system, surface turbulence will lead to the entrainment of oxide film into the bulk liquid. Previous studies have shown that the entrained oxide film will have a harmful effect on the reproducibility of mechanical properties of cast aluminum alloys. In this work, the ultimate tensile strength (UTS) and Weibull modulus of elongation of sand cast bars produced under different casting conditions were compared as an index of casting reliability, which is a function of oxide film content. The results show that the use of thin channel and filter can significantly eliminate the surface turbulence of melt during mold filling, so as to avoid the generation and entry of meltinment of surface oxide films and in turn produce castings with more reliable and reproducible mechanical properties compared to the castings produced using conventional running systems.

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