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材料工程  2012 

镍基单晶高温合金凝固缺陷研究进展

, PP. 93-98

Keywords: 镍基单晶高温合金,定向凝固,凝固缺陷,工艺参数

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Abstract:

镍基单晶高温合金的凝固缺陷对其力学性能有很大的影响，减少和控制凝固缺陷对提高合金性能和降低成本具有重要意义。综述了镍基单晶高温合金定向凝固过程中可能出现的几个重要缺陷，包括缩松、雀斑、晶体取向的偏离和杂晶，重点讨论了这些缺陷的特点和产生的机理，并从合金成分、工艺参数、铸件结构等方面分析了凝固缺陷的影响因素，指出了减少单晶高温合金凝固缺陷的措施。

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