成分及工艺因素对球墨铸铁石墨漂浮的影响

采用金相观察法研究了成分及工艺参数对球墨铸铁石墨漂浮程度的影响规律。结果表明,石墨漂浮带的深度将随碳当量增加（尤其是碳量的增加）和铸件壁厚、浇注温度的增加而增大。碳当量高是引起石墨漂浮的主要原因。石墨漂浮的出现有一个临界碳当量值,但这个临界值不是固定的,它还与铸件厚度和浇注温度有关,碳当量对石墨漂浮的影响对壁厚很敏感,铸件壁厚越大,随碳当量增加石墨漂浮增加的幅度越大。

Effect of Composition and schedule on Graphite Floatation in Nodular Graphite Cast Iron

The effect of composition and schedule on extent of graphite floatation was studied by observing metal graphics. The results show that the depth of the graphite floatation band will be increasing (in particular carbon quantity increase) along with the carbon equivalent and section size, the pouring temperature increase increases.The increase of carbon equivalent is primary reason for graphite floatation. When graphite floatation appears, there is critic carbon equivalent, which is not constant but varies with section size and pouring-temperature of castings. The effect of carbon equivalent on graphite floatation is sensitive to the section size of castings. The larger section size is, the larger increments of the graphite flotation are with the increment of the carbon equivalent.