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Structural Reconstruction of Solidification Kinetics in Cast Iron with Spherical Graphite

机译：球墨铸铁凝固动力学的结构重构

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摘要

A novel method for the structural reconstruction of solidification kinetics in cast iron with spherical graphite (SGI) is described in this paper. The method includes an automated SEM/EDX analysis of different micro-features in SGI structure, separation of graphite nodule statistics from non-metallic inclusions, and conversion to a three dimensional Population Density Function (PDF_(exp)). A structure integrator was developed to simulate the PDF_(sim) for the arbitrary nucleation and growth rate functions. Structural reconstruction of the solidification kinetics in the industrial castings was done by inverse optimization and matching both PDF functions at unique parameters of graphite nodule nucleation and growth. It was shown that SGI solidification kinetics in industrial castings significantly differ from those predicted by basic nucleation models. The cooling rate and inoculation have large effects on the kinetics of graphite nodule nuclei formation during solidification. It was proved that the observed bi-modal PDF function in inoculated SGI is related to the second nucleation wave. The suggested method provides insight into the nucleation process in SGI casting and can be used as a tool for process control. Reconstructed solidification kinetics can help in the design of effective inoculants and melt treatment methods. Knowledge about nucleation parameters can be also used for improving simulations of casting solidification.
机译：本文介绍了一种利用球形石墨（SGI）重构铸铁中凝固动力学的结构的新方法。该方法包括对SGI结构中不同微观特征进行自动SEM / EDX分析，将石墨结核统计信息与非金属夹杂物分离以及转换为三维人口密度函数（PDF_（exp））。开发了一种结构积分器，以模拟PDF_（sim）的任意成核和增长率函数。工业铸件中凝固动力学的结构重建是通过逆向优化完成的，并在石墨结核成核和生长的独特参数上匹配两个PDF函数。结果表明，工业铸件中的SGI凝固动力学与基本成核模型所预测的明显不同。冷却速率和接种对凝固过程中石墨结节形核形成的动力学有很大影响。事实证明，在接种的SGI中观察到的双峰PDF函数与第二个成核波有关。所建议的方法可以洞悉SGI铸造中的成核过程，并且可以用作过程控制的工具。重构的固化动力学可以帮助设计有效的孕育剂和熔体处理方法。关于成核参数的知识也可以用于改进铸件凝固的模拟。

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