【摘要】 根据球铁中石墨／基体（Ｇ／ｍ）界面微观力学行为以及球状裂纹扩展微观过程研究的结果。设计了以球墨外包的马氏体球壳（Ｍｓｈ）和铁素体＋块状马氏体（Ｆ＋Ｍｍ）的双相基体，即Ｇ＋Ｍｓｈ＋Ｆ＋Ｍｍ的优化球铁组织（Ｍｏｐ）；从球铁中Ｆ＋Ｍ形成的相变机理、热力学及动力学分析，提出实现Ｍｏｐ的热处理；性能测试结果证实Ｍｏｐ球铁具有优越的宏观机械性能．更多还原

【Abstract】 According to the results of researches on micro-mechanical behavior of G/M interface and micro -processes on nodular iron crack propagation[1], an optimum microstructure(Mop) in which the graphite was surrounded by a martensitic shell(M8h) and the dual-phase matrix was composed of ferrite and massive martensite have ben disigned. By analysis of phase tiansformation mechanism, thermaldynamics and kinetics on the formation of (F+M)in nodular iron, the heat treatment that can achieve Mop have ben proposed. The experiment show that the nodular iron with Mop has excellent macro-properties.更多还原