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研究表明，低碳球铁中的球状石墨内部结构为C轴呈放射状的多晶体，并呈现出明显的年轮状结构，球状石墨既能以“气泡”形核，也能以“球形夹杂物”形核。石墨球的核心应该是球形。
The results show that the internal structure of spheroidal graphite in low carbon ductile iron is radial polycrystal on C-axis and exhibits an annual ring structure. The spheroidal graphite can nucleate with “bubble” and can also take “spherical inclusions ”nucleation. The core of graphite ball should be spherical.