通过在铁素体球墨铸铁中加入钼元素,研究了钼对其组织和力学性能的影响。结果表明,在730℃下保温4 h,可获得单一铁素体基体和细小石墨球颗粒的双相退火组织,石墨球分布均匀、圆整。钼的加入并不能细化石墨球组织,反而恶化石墨球形态。钼的加入使铁素体球墨铸铁的冲击韧度和伸长率显著降低,不利于高热应力工况下的反复使用。 The effect of molybdenum on its microstructure and mechanical properties was studied by adding molybdenum to ferrite nodular cast iron. The results show that the microstructure of single ferrite matrix and fine graphite spheres are annealed at 730 ℃ for 4 h. The graphite spheres are uniformly distributed and rounded. The addition of molybdenum can not refine the graphite ball organization, but worsen the graphite ball morphology. The addition of molybdenum ferritic ductile iron impact toughness and elongation significantly reduced, is not conducive to repeated use of high thermal stress conditions.