科研之友
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摘要
In order to understand the mechanism of grain refinement achieved by electromagnetic field, ingots of an Al-Zn-Mg-Cu-Zr alloy with diameter of 200 mm were cast and the temperature field was measured during the casting process. The results show that the electromagnetic field can induce the forced convection, leading to a quite uniform temperature field and a low temperature (6°C bellow the liquidus). Therefore, the thermal history of the melt from pouring to being solidified is changed obviously, resulting in an enhanced heterogeneous nucleation and remarkable decrease of the remelting of the formed nuclei and the formation of fine and uniform spherical equiaxed microstructure.
- 出版日期2013
- 单位东北大学
