Effect of high magnetic field on the primary dendrite arm spacing and segregation of directionally solidified superalloy DZ417G
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- 作者：Tao Zhang ; Weili Ren ; Jianwen Dong ; Xu Li ; Zhongming Ren ; Guanghui Cao ; Yunbo Zhong ; Kang Deng ; Zuosheng Lei ; Jianting Guo
- 关键词：High temperature alloys ; Directional solidification ; Microstructure ; High magnetic fields
- 刊名：Journal of Alloys and Compounds
- 出版年：2009
- 出版时间：13 November 2009
- 年：2009
- 卷：487
- 期：1-2
- 页码：612-617
- 全文大小：1895 K
文摘
High magnetic field has been applied to the directional solidification of superalloy DZ417G. The results show that high magnetic field can significantly influence the primary dendrite arm spacing and microsegregation. A 6 T magnetic field can decrease the primary dendrite arm spacing by 22 % at a drawing speed of 40 μm/s. Nevertheless, when the magnetic field is greater than 6 T the primary dendrite arm spacing begins to increase. The microsegregation of Ti and Mo can be also decreased by about 28 % and 40 % respectively with a 6 T magnetic field at a drawing speed of 40 μm/s. These phenomena are attributed to the competitive relationship of the electromagnetic damping and thermoelectromagnetic convection caused by the high magnetic field.