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Effect of LSPWES Process on Semisolid A356 Alloy Slurry Feedstock

It is demonstrated that the fine spheroidal and equiaxed non-dendritic microstructures required for semisolid casting can be formed by low superheat pouring and weak traveling-wave electromagnetic stirring (LSPWES). The effects of pouring temperature and then soaking treatment on the microstructure of A356 slurry were investigated. The results show that if A356 alloy is poured at 630 or 650°C and meanwhile stirred by an electromagnetic field at low power for a short time, the pouring process can be easily controlled and most solidified primary α-Al grains become spherical and only a few of them are rosette-like. Weak traveling-wave electromagnetic stirring makes the temperature field more homogeneous and makes the primary α-Al grains disperse in a large region, which leads to the spherical microstructure of primary α-Al grains. When the A356 alloy is soaked or reheated at the semisolid state, the primary α-Al grains ripen further and they become more spherical, which is favorable to the semisolid forming of A356 alloy.