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用计算各组成相比容的办法计算了球墨铸铁共晶转变时的体积变化。在计算奥氏体的比容时，考虑了奥氏体中的含碳量对晶格常数的影响；依据Ｆｅ－Ｃ－Ｓｉ凝固相图和共晶球铁的典型冷却曲线确定了共晶奥氏体的含碳量。所得计算结果比较符合实际
The volume change of the ductile iron during eutectic transformation was calculated by calculating the relative volume of each composition. In calculating the specific volume of austenite, the influence of carbon content in austenite on the lattice constant was considered. Based on the typical cooling curves of Fe-C-Si solid phase diagram and eutectic ductile iron, The carbon content of the body. The calculated results are more realistic