Three-Dimensional Microstructural Characterization of Cast Iron Alloys for Numerical Analyses
Three-Dimensional Microstructural Characterization of Cast Iron Alloys for Numerical Analyses
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DOI：
10.4028/www.scientific.net/msf.925.427
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发表时间：
2018-06
期刊：
影响因子：
--
通讯作者：
K. Salomonsson;A. Jarfors
中科院分区：
文献类型：
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作者：
K. Salomonsson;A. Jarfors
在本文中，我们的目的是表征三种不同的铸铁合金及其显微组织特征，即片状，压实和球墨铸铁。微观特征的表征对于开发优化铸铁合金行为的方法至关重要;例如，在保持强度的同时最大化散热和/或最大化延展性。这些性能的变化通常通过合金的二维表示的金相学来分析。然而，更精确的估计的形态和材料特性是通过三维重建的微观结构。X射线显微层析成像的使用提供了一个很好的工具，以产生高分辨率的三维微观结构图像。分析了不同铸铁合金显微组织中石墨成分的特征，包括石墨的大小、形状和连通性。据观察，层状和压实石墨铁合金具有相对较大的连接石墨形态，与石墨作为结节存在的球墨铸铁相反。不同合金的表征结果最终用于生成有限元模型。
In this paper, we aim at characterizing three different cast iron alloys and their microstructural features, namely lamellar, compacted and nodular graphite iron. The characterization of microscopic features is essential for the development of methods to optimize the behavior of cast iron alloys; e.g. maximize thermal dissipation and/or maximize ductility while maintaining strength. The variation of these properties is commonly analyzed by metallography on two-dimensional representations of the alloy. However, more precise estimates of the morphologies and material characteristics is obtained by three-dimensional reconstruction of microstructures. The use of X-ray microtomography provides an excellent tool to generate high resolution three-dimensional microstructure images. The characteristics of the graphite constituent in the microstructure, including the size, shape and connectivity, were analyzed for the different cast iron alloys. It was observed that the lamellar and compacted graphite iron alloys have relatively large connected graphite morphologies, as opposed to ductile iron where the graphite is present as nodules. The results of the characterization for the different alloys were ultimately used to generate finite element models.