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首页> 外文期刊>Journal of Materials Science >Predicting freckle formation in single crystal Ni-base superalloys
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Predicting freckle formation in single crystal Ni-base superalloys

机译：预测单晶镍基高温合金中的雀斑形成

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摘要

Freckle formation has been investigated in thirty-two distinct experimental single crystal Ni-base superalloys with large compositional variations. In addition to variations in alloy chemistry, the components studied in this investigation consisted of cylindrical bars with different diameters and solid blade-shaped components unidirectionally solidified in industrial casting trials. The occurrence of freckles was statistically assessed in over four hundred and seventy single crystal components. Detailed analyses of the microstructures, segregation behavior and phase transformation temperatures are presented and utilized to develop regression models capable of predicting the occurrence of freckle formation during solidification. The significance of the physical parameters incorporated with the model, and the implication of the model on the approach for alloy design are discussed. (C) 2004 Kluwer Academic Publishers.
机译：在具有大的组成变化的32种不同的实验性单晶Ni基高温合金中研究了雀斑的形成。除了合金化学的变化之外，本次研究中研究的组件还包括直径不同的圆柱棒和在工业铸造试验中单向凝固的坚固叶片形组件。统计分析了470多个单晶成分中雀斑的出现。介绍了对微观结构，偏析行为和相变温度的详细分析，并将其用于开发能够预测凝固过程中雀斑形成的回归模型。讨论了与模型结合的物理参数的重要性，以及该模型对合金设计方法的意义。 （C）2004 Kluwer学术出版社。

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