Effect of the Melt Flow on the Solidified Structure of Middle Carbon Steel by Means of the Levitation Method Using Alternating and Static Magnetic Fields
Effect of the Melt Flow on the Solidified Structure of Middle Carbon Steel by Means of the Levitation Method Using Alternating and Static Magnetic Fields
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DOI：
10.2355/isijinternational.47.612
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发表时间：
2007-04
影响因子：
1.8
通讯作者：
H. Yasuda;T. Yoshimoto;T. Mizuguchi;Y. Tamura;T. Nagira;M. Yoshiya
中科院分区：
文献类型：
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作者：
H. Yasuda;T. Yoshimoto;T. Mizuguchi;Y. Tamura;T. Nagira;M. Yoshiya
采用交变磁场和静磁场悬浮法研究了熔体流动对中碳钢凝固组织的影响。在本研究中，研究了较低过冷区域（低于 70 K）的凝固。随着静磁场的增强，悬浮熔体中的熔体流动不断减小。凝固组织中等轴组织的部分也随着熔体流速的降低而减少。当凝固过程中施加超过0.8T的静磁场时，没有观察到等轴结构。由夹杂物之间的运动定义的代表熔体流速的相对速度的平均值在 0.8 T 的磁场下降低至约 0.01 m/s。目前的结果表明，当熔体中的流速降低至 10−3 m/s 的量级时，可以抑制枝晶臂的破碎。
Effect of melt flow on the solidified structure of middle carbon steel was examined by a levitation method using alternating and static magnetic fields. In this study, solidification in the lower undercooling region (less than 70 K) was studied. As the static magnetic field increased, the melt flow in the levitated melt was continuously reduced. Portion of the equiaxed structure in the solidified structure also decreased with decreasing the melt flow velocity. The equiaxed structure was not observed when a static magnetic field exceeding 0.8 T was imposed during solidification. Average of the relative velocity, which was defined from motion between the inclusions for representing the melt flow velocity, was reduced to be approximately 0.01 m/s at a magnetic field of 0.8 T. The present results showed that fragmentation of the dendrite arms could be suppressed when the flow velocity in the melt was reduced to be in the order of 10−3 m/s.