利用金相显微镜、材料万能力学测试机和磁天平对无磁球墨铸铁的金相组织、力学性能和磁导率等进行了研究。结果表明:锰可以降低铁液中碳的饱和度,阻止碳的析出,促进奥氏体的形成,并与硅元素一起相互配合、相互制约,得到以奥氏体为主,渗碳体为辅的组织。当含锰量为9%,Si/Mn比为0.5时,无磁球墨铸铁的力学性能和磁导率达到最佳。 The microstructure, mechanical properties and permeability of non-magnetic ductile iron were studied by using metallographic microscope, material universal mechanical testing machine and magnetic balance. The results show that manganese can reduce the saturation of carbon in molten iron, prevent the precipitation of carbon, promote the formation of austenite, cooperate with silicon and mutually restrict each other, and obtain austenite and cementite as auxiliary Of the organization. When the content of manganese is 9% and the Si / Mn ratio is 0.5, the mechanical properties and magnetic permeability of non-magnetic ductile iron are optimized.