John F. Grandfield

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TL;DR: In this article, the effect of grain refinement and cooling rate on hot tearing susceptibility has been analyzed using modifications to the Rappaz-Drezet-Gremaud hot tearing model and using empirical equations developed for grain size and dendrite arm spacing (DAS) on the addition of grain refiner for a range of cooling rates.

TL;DR: In this paper, a tensile testing machine and a customised mold were used to control thermal and mechanical parameters during solidification of a relatively pure material, alloy AA194, and a highly alloyed, extended freezing range alloy, AA7075.

TL;DR: In this paper, the authors investigated the hot tear susceptibility of ternary Al-Si-Mg alloys using direct crack observation, measurement of load response, and predictions made by a modified Rappaz-Drezet-Gremaud (RDG) hot tearing model, and found that correlation with the RDG model depended critically on the fraction solid at which solid coalescence was assumed to occur.

TL;DR: In this article, a modified RDG model for dendritic equiaxed grains was proposed to reduce hot tearing susceptibility by delaying strength development and interdendritic feeding.