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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing >On the solidification sequence of ductile iron castings containing chunky graphite
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On the solidification sequence of ductile iron castings containing chunky graphite

机译：含块状石墨球墨铸铁的凝固顺序

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摘要

The macro- as well as the microstructures in ductile iron castings containing chunky graphite have been investigated. Instrumented castings with wall thicknesses ranging from 10 to 200mm were studied using optical and scanning electron microscope. The graphite morphology was revealed by the deep etching technique. Information about the solidification sequence could be obtained by combining thermal analysis results with a color etching technique revealing the segregation pattern. The amount of chunky graphite generally increases with an increasing wall thickness. However, chunky graphite occasionally appeared even in 10 mm castings. After a relatively sharp transition, following the macroscopic isotherms, chunky graphite starts to grow as eutectic cells. When approaching the outer regions of the cells, the graphite suddenly became significantly coarser, before a complete transition took place into ordinary graphite nodules. Further on, by color etching it was found that the major part of the graphite nodules in many cases was located in the most segregated areas. This suggests that chunky graphite forms early during eutectic solidification, before formation of the nodular graphite. The growth rate of the chunky graphite eutectic cells was of the same order of magnitude as in gray iron but slower compared to supercooled D-graphite cells.
机译：研究了含块状石墨的球墨铸铁的宏观结构和微观结构。使用光学和扫描电子显微镜研究了壁厚为10至200mm的仪器铸件。通过深蚀刻技术揭示了石墨的形态。通过将热分析结果与揭示偏析图案的彩色蚀刻技术相结合，可以获得有关凝固顺序的信息。块状石墨的量通常随着壁厚的增加而增加。但是，即使在10 mm的铸件中，有时也会出现块状石墨。经过一个相对尖锐的转变后，遵循宏观等温线，块状石墨开始以共晶细胞的形式生长。当接近孔的外部区域时，石墨突然变得明显变粗，然后才完全转变成普通的石墨结核。此外，通过彩色蚀刻发现，在许多情况下，石墨结节的主要部分位于最隔离的区域。这表明块状石墨在共晶凝固过程中的早期形成，而在形成结节状石墨之前。块状石墨共晶电池的生长速率与灰铸铁中的数量级相同，但与过冷的D石墨电池相比要慢一些。

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