复相强化是改善钢和球铁机械性能的一个有效措施。本文在使用相同铸态试样条件下,对铁素体—下贝氏体和奥氏体—贝氏体球铁的机械性能进行了对比试验,结果表明,在相同基体硬度下,除抗拉强度略低外,奥贝球铁的延性和韧性均明显高铁素体—下贝氏体球铁。同时,借助于透射电镜和 X 射线衍射分折,初步分析了上述球铁的复相强化机制。 Complex phase strengthening is an effective measure to improve the mechanical properties of steel and ductile iron. The mechanical properties of ferrite-bainite and austenitic-bainitic ductile iron under the condition of the same as-cast sample were compared. The results show that in the same base hardness, The strength is slightly lower, the ductility and toughness of Aubei ductile iron are obviously high ferrite - bainite ductile iron. At the same time, with the help of transmission electron microscopy and X-ray diffraction analysis, the complex phase strengthening mechanism of the above-mentioned ductile iron was analyzed.