本文研究了Si、Mn、Cu、Ni、Mo对奥贝球铁显微组织和机械性能的影响。发现奥贝球铁显微组织中:沿共晶团边界分布的白亮区是最后凝固的严重偏析的残余奥氏体区,其中含有碳化物和马氏体,因而使塑性大大降低。所研制的CuMo、NiMo和CuNiMo系奥贝球铁具有良好的显微组织和机械性能。 In this paper, the effects of Si, Mn, Cu, Ni, Mo on the microstructure and mechanical properties of austenitic ductile iron were studied. It was found that in the austempered ductile iron microstructure, the white bright areas distributed along the boundaries of the eutectic are the most segregated residual austenite regions which finally solidify, which contain carbides and martensite, thereby greatly reducing the plasticity. Developed by the CuMo, NiMo and CuNiMo Department of Austempered ductile iron has good microstructure and mechanical properties.