Abstract
High pressures applied to the castings during solidification mean that semi-solid castings tend to be prone to surface blistering during subsequent T6 heat treatment. It is believed that the blistering originates from subsurface defects present in the semi-solid castings, which expand when exposed to high temperatures during the solution heat treatment. Despite the significance of blistering to the commercial development of the semi-solid casting process, there have only been limited quantitative studies of the impact of process parameters on blistering. This paper, therefore, will report on a study to examine the impact of a number of process parameters including intensification pressure, plunger velocity and solid fraction of the feed material on the blistering of semi-solid castings during T6 heat treatment. The location and average size of blisters formed at each condition have been measured and related to the casting conditions.
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