通过对各种处理剂处理的蠕虫状石墨铸铁凝固过程的研究,共晶反应时石墨的析出过程已经明确。从共晶反应冷却曲线可看到两个转变阶段:第一阶段,共晶反应前形成的球状石墨伴随奥氏体壳生长;第二阶段形成蠕虫状石墨,因包围球状石墨的奥氏体部分熔解,使它与熔液接触生长。从而,说明了共晶凝固第一阶段形成的球状石墨为蠕虫状石墨生长的起点。 Through the research on the solidification process of worm-like graphite cast iron treated by various treating agents, the precipitation process of graphite during eutectic reaction has been clarified. From the eutectic reaction cooling curve can be seen two stages of transformation: the first stage, the eutectic reaction with the formation of spherical graphite with austenite shell growth; the second stage worm-shaped graphite, surrounded by spherical graphite austenite part Melt, make it contact with the melt growth. Thus, the first phase of eutectic solidification of spherical graphite is described as the starting point for worm-like graphite growth.