pISSN : 1598-706X / eISSN : 2288-8381
한국주조공학회지 (4권4호 260-265)
The Influence of Cooling Rates on the CFR and the MDE of Al-Si Alloys.
Al-Si합금(合金)의 CFR 과 MDE 에 미치는 냉각속도(冷却速度)의 영향(影響)
Hyuk- Moo Kwon*, Soo- Young Kim**
*Chung Nam National University, **HanYang univ.
In order to clarify the solidification mechanism of Al-Si alloy, Mushy Degree of Eutectic Solidification (MDE) and Centerline Feeding Resistance (CFR) were systematically studied by casting with various compositions of Al-(6~18%) Si alloys into several kinds of molds having different cooling rates. The results are as follows: 1. CFR% increases slightly as solute concentration increases, but decreases remarkably as the cooling rate of the mold increases, that is, the composition dependence of the alloys has more effect on the change of CFR% than that of the mold cooling rate. 2. The composition dependence of MDE value has the same tendency as that of Degree of Eutectic Solidification (DES). MDE value within the range of hypereutectic composition is larger than that of hypoeutectic and it represents the maximum value at eutectic composition. The higher the cooling rate is, the less the MDE value is.
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