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金属学报  2013 

电磁场对Inconel625合金凝固组织及力学性能的影响

DOI: 10.3724/SP.J.1037.2013.00509, PP. 1573-1580

Keywords: 电磁场,Inconel,625合金,凝固组织,枝晶偏析,拉伸性能

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Abstract:

将电磁场引入到Inconel625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100A,频率为8Hz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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