球墨铸铁灰斑断口研究

Study on the Speck of Nodular Cast Iron

用电镜检验了球铁断口中灰斑区的形貌与化学成分，并探索了灰斑区的形成机理。通过对灰斑区的研究，论证了一些影响球铁强度的因素，还发现了球铁中Ａｌ成分的偏析。

The morphology and chemical ingredients of gray speck on the fracture of nodular cast iron was inspected through electromicroscope,and the formation mechanation mechanism of the gray speck area was explored.The study the factors affecting the strength of nodular castiron and finds the segregation Alin nodular castiron.