将电磁场引入到Inconel 625合金的凝固过程中,研究电磁力对合金凝固组织和力学性能的影响.结果表明,电磁场可显著细化合金晶粒,但当施加不合理的电流强度和频率时,电磁场会加速凝固前沿的熔体对流,导致凝固末端产生更严重的枝晶偏析,形成更多的共晶组织.微观表征结果表明,电磁场作用下Nb和Mo元素偏析比的增大,是共晶组织含量增多的根本原因.晶粒细化和共晶组织增多共同影响了合金的室温拉伸性能,使合金屈服强度提高、拉伸塑性下降.合理控制电流强度及频率大小可有效控制共晶组织分数.当施加电磁场的电流强度为100 A,频率为8 Hz时,合金中共晶组织含量最少,合金在不损失塑性的前提下屈服强度提高30%以上.
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