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首页> 外文期刊>Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science >Study of Microsegregation and Laves Phase in INCONEL718 Superalloy Regarding Cooling Rate During Solidification
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Study of Microsegregation and Laves Phase in INCONEL718 Superalloy Regarding Cooling Rate During Solidification

机译：关于INCONEL718高温合金凝固过程中冷却速率的微偏析和拉维斯相的研究

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摘要

Cooling rate is an important and controllable variable in casting processing. The effect of cooling rate on the microsegregation and Laves phase in INCONEL718 superalloy castings was studied by high-temperature-laser confocal scanning microscopy and quantitative metallography in this study. The transformation rate of solid phase with a feature of Gaussian distribution in the solidifications at the cooling rates of 0.10 to 14 K/s is acquired. The solidification time and secondary dendrite arm spacing (SDAS) as a function of cooling rate are analyzed. The amount of Laves phase presents a maximum value at a threshold cooling rate of 3 K/s owing to the opposite effects of cooling rate on the solidification time and SDAS. A modified dimensionless microsegregation index criterion was used for the scaling of solute segregation and Laves phase depending on cooling rates. The prediction of maximal microsegregation and the amount of Laves phase by MSI and experiments provide a guide for cooling rate control in the casting applications.
机译：冷却速度是铸造过程中重要且可控制的变量。通过高温激光共聚焦扫描显微镜和定量金相研究了冷却速率对INCONEL718高温合金铸件中微观偏析和Laves相的影响。获得了在冷却速率为0.10至14 K / s时具有凝固过程中高斯分布特征的固相转变速率。分析了凝固时间和二次枝晶臂间距（SDAS）随冷却速度的变化。由于冷却速率对凝固时间和SDAS的相反影响，Laves相的数量在3 K / s的阈值冷却速率下呈现最大值。修改后的无量纲微偏析指数标准用于根据冷却速率缩放溶质偏析和Laves相。 MSI对最大微偏析和Laves相数量的预测以及实验为铸造应用中的冷却速率控制提供了指导。

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