Effects of Sand Grain Size and Water Content of Frozen Mold on Cooling Behavior of Lead-Free Bronze

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  • 青銅合金CAC902の冷却挙動に及ぼす凍結鋳型の砂の粒度と水分量の影響
  • セイドウ ゴウキン CAC902 ノ レイキャク キョドウ ニ オヨボス トウケツ イガタ ノ スナ ノ リュウド ト スイブンリョウ ノ エイキョウ

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A frozen sand mold is produced by freezing a mixture of sand and water, thus casting processes using the frozen sand mold have less environmental load. Therefore, this process is getting an attention. In this study, the effects of grain size of sand, water content of mold, and pouring temperature on the cooling behavior of bronze cast (CAC902) made by using a frozen sand mold were investigated. The cooling speed of the bronze cast increased with increasing grain size of the sand and water content of the mold. In particular, the water content of the mold was found to be effective for improving the cooling rate of the bronze just after pouring, and thus a finer microstructure was obtained by increasing water content. The microstructure of the cast poured at 1413K showed a columnar structure. In contrast, the microstructure poured at 1373K exhibited an equiaxed structure, because the temperature of the molten bronze rapidly decreased below liquidus temperature. From these results, it is clear that the cooling behavior of the cast can be controlled by changing the grain size of sand, water content, and pouring temperature. As a result, the microstructure of the cast can also be controlled.

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