Effect of Longitudinal Magnetic Field on Microstructures of Directionally Solidified Ni-based Superalloy
The effect of a longitudinal static magnetic field on the microstructures of the superalloy DZ417G during directional solidification at the low withdrawal velocity was investigated experimentally.The experimental results showed that the application of a high static magnetic field significantly changed the interface shapes and microstructures of the superalloy.In practice,when the magnetic filed is applied,the well-ordered columnar dendrite structures still existed in the entire sample as the increase of magnetic field from 0 to 0.3 T.With the increase of magnetic field,the columnar to equiaxed transition(CET)occurred and reaches a maximum under a 0.5 T magnetic filed,and then decrease with the magnetic filed still increase.When the magnetic field is higher than 1.2 T,equiaxed grains zone on the edge of sample increased again and gradually extended from the edge to the center of the sample.Moreover,the macrosegregation may occur along with the appearance of the equiaxed grains.These phenomena should be contributed to interaction of the EMD and TEMC in liquid phase and TEMF in solid phase.
magnetic field directional solidification superalloy dendrite spacing equiaxed grains freckles
XUAN Wei-dong REN Zhong-ming LI Chuan-jun
School of Material Science and Engineering,Shanghai University,Shanghai 200072,China
国际会议
The 7th International Conference on Electromagnetic Processing of Materials(第七届冶金与材料电磁过程国际大会)
北京
英文
1-5
2012-10-22（万方平台首次上网日期，不代表论文的发表时间）