锰对灰铸铁凝固特性的影响

灰铸铁的含锰量在0．5％－2．3％范围内变化时，对其一次结晶的热分析曲线特征点，结晶白口倾向、铁液表面张力变化、一次结晶组织特点等，进行了较系统地统计回归分析与研究讨论；试验发现，反石墨化的正确偏析元素可促进1种新型“逆B型”石墨出现，其分布特征完全不同于现有国标已命标的A、B、C、D、E、F型石墨。

Effects of Manganese on the Solidification of Gray Cast Iron

The present paper investigated the following asp ects, as the manganese content in gray cast iron varied from 0.5% to 2.3%, the c ritical points of the thermal analysis curves of primary crystallization，the tendency o f chilling to white fracture，evolution ofthe surface tension of the molt en iron，and the microstructure. Systematical statistical regre ssion has been applied.The results showed that manganese，a positive segreagtio n element which is adverse to graphitization，can facilitate the presence of a novel "anti-B type" graphite,whose distribution patterns are completely differe nt from the presently known graphite of A，B，C，D，E or F type.