W.X. Han
,
X.H. Qin
,
D.Z. Li and K. Yang (Institute of Metal Research
,
The Chinese Academy of Sciences
,
Shengyang 110015
,
China)
金属学报(英文版)
Rotating electromagnetic field is applied to the centrifugal casting, the macrostructure of centrifugal casting Al-1%Cu alloy stirred with driving or backing magnetic field are both examined. It is shown that both kinds of electromagnetic filed can enforce the columnar-equiaxed transition, the driving one decrease the tendency of porosity occurring due to the increase in the bulk liquid pressure. Stirring with braking electromagnetic field produces the mixture of outer fine grains and inner coarse grains in the casting, this is analyzed to be contributed to the differences both in electric conductivity and density between the crystal and the melt, as well as skin effects.
关键词:
centrifugal casting
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