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首页> 外文会议>TMS(The Minerals, Metals amp; Materials Society) Annual Meeting and Symposium on Solidification of Aluminum Alloys; 20040314-20040318; Charlotte,NC; US >CHARACTERISATION BY THE p~*METHOD OF EUTECTIC AGGREGATES SPATIAL DISTRIBUTION IN 5xxx AND 3xxx ALUMINUM ALLOYS CAST IN WEDGE MOULDS AND COMPARISON WITH SDAS MEASUREMENTS
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CHARACTERISATION BY THE p~*METHOD OF EUTECTIC AGGREGATES SPATIAL DISTRIBUTION IN 5xxx AND 3xxx ALUMINUM ALLOYS CAST IN WEDGE MOULDS AND COMPARISON WITH SDAS MEASUREMENTS

机译：楔型铸造5xxx和3xxx铝合金中共晶聚集体空间分布的p〜*方法表征及与SDAS测量的比较

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摘要

In order to quantitatively compare the microsegregation patterns of as cast aluminum alloys, and in the future, to objectively compare computed microstructures with real ones, a quantitative metallography index named p~* for as cast microstructures based on an image analysis algorithm has been developed within Pechiney and shared among the participants of the European project VIRCAST. The present paper exposes the results of a benchmark done by all participants within the project on the use of the p~* measurement, on two families of alloys (3xxx and 5xxx) cast in Coras laboratories in a wedge shaped mould in order to scan various solidification rates. It is shown that the p~* algorithm provides a quantitative and reliable assessment of the average size of particle free zones in as cast microstructures as long as proper parameters are used in terms of sampling vs resolution compromise. The p~* values have been shown to correlate with the main alloy and solidification parameters (cooling rate, grain refinement, eutectic fraction) inasmuch as these parameters exert interactive influences on the morphological or topological patterns of the solidification structure.
机译：为了定量比较铸造铝合金的微观偏析模式，并在将来将计算的微观组织与真实的微观组织进行客观比较，基于图像分析算法，开发了一种定量的金相指数p〜*作为铸造微观组织。 Pechiney并与欧洲VIRCAST项目的参与者分享了这一信息。本文介绍了项目中所有参与者针对使用p〜*测量对在楔形模具中在Coras实验室浇铸的两种合金（3xxx和5xxx）的两种合金（3xxx和5xxx）进行扫描的基准结果，以便扫描各种凝固速度。结果表明，只要在采样与分辨率折衷方面使用了适当的参数，p〜*算法就可以对铸造微结构中的无颗粒区的平均尺寸进行定量和可靠的评估。 p〜*值已显示与主要合金和凝固参数（冷却速率，晶粒细化，共晶分数）相关，因为这些参数对凝固组织的形态或拓扑模式具有交互影响。

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