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pISSN : 1598-706X / eISSN : 2288-8381


한국주조공학회지 (20권3호 197-207)

Evolution of Solidification Structures of Al-Si Alloys in a Vertical Centrifugal Casting

Al-Si합금의 수직원심주조시 응고조직의 형성

Sung-Rak Chang, Seung-Ho Huh, Chun-Pyo Hong

Yonsei University


Al-Si alloys were solidified in a rotating cylindrical mold by a vertical centrifugal casting process. Under a certain casting condition, there are four distinct zones such as the chill zone, the primary fine columnar zone, the equiaxed zone, and the secondary coarse columnar zone from the mold wall. The columnar-equiaxed transition (CET) and the equiaxed-columnar transition (ECT) were measured as functions of solute content, flow rate (mold velocity), pouring temperature and mold temperature. Within the critical value of solute content, as the flow rate increases, the columnar-equiaxed transition were found, but not the equiaxed-columnar transition. The aspect ratio of the primary columnar zone was more affected by the solute content than the flow rate. However the aspect ratio of the equiaxed zone was more affected by the flow rate than the solute content. The aspect ratio of the secondary columnar zone was affected by both the flow rate and the solute content.