The purpose of this work was to observe hot-tearing susceptibility in a permanent mold casting process by changing the pouring and mold temperatures and adding a grain refiner. Accordingly, the resulting microstructures and crack lengths of an A356 Al alloy specimen were studied using an optical microscope and radiographic tests. The higher melt and mold temperatures enhanced the hot-tearing susceptibility through a reduced number of intercrystalline boundary films, which are the basis for stress action. The grain refinement also reduced the hot-tearing susceptibility by enhancing the number of intercrystalline films, which are the basis for stress action.
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