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金属学报  2015 

单晶高温合金凝固特性与典型凝固缺陷研究

DOI: 10.11900/0412.1961.2015.00448, PP. 1163-1178

Keywords: 单晶高温合金,凝固特性,凝固缺陷

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Abstract:

单晶高温合金是一种复杂组元多相组织材料,随着合金化程度的不断提高、难熔元素的增多和叶片结构的复杂化与大型化,凝固缺陷控制成为提高叶片质量和性能的关键.单晶合金的凝固组织及凝固缺陷不仅与合金成分有关,还取决于其凝固特性及工艺条件,本文阐述了先进单晶合金固/液相变温度、凝固分配系数等凝固特性的特点和变化规律,重点分析了晶体取向偏离和杂晶2种典型凝固缺陷形成机制及其与凝固特性、工艺条件的关系,探讨了解决复杂单晶叶片典型缺陷的方法和思路,并评述了不同控制方法的实施效果.

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