Abstract
The effect of Sr-modification on pore formation in reduced pressure and atmospheric conditions was studied. It was found that in thin wall steel cup conventional specimens, the Sr-modification had no significant effect on pore formation. A new type of metallic cup with a riser was designed for use in a reduced pressure test as a mould. It was designed to improve directional solidification so that no macro shrinkage occurred in test samples. Using this mould, the effect of Sr-modification on pore formation was investigated. The effect of Sr-modification on the increased pore number density and pore volume fraction became significant in both reduced pressure and atmospheric conditions. Also, the results indicate that the effect of Sr-modification on pore formation of reduced pressure samples is not considerable in the melt with a hydrogen content lower than 0.1cc/100g Al.
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