【摘要】 为满足汽车发动机缸体高性能要求，在灰铸铁中添加Mo和V，利用OM、SEM、EPMA等手段分析其组织变化，进行力学性能和导热性能的检测。结果表明：含0.5wt.%Mo和0.3wt.%V的灰铸铁试样，相比于空白试样，共晶反应后温度降低，石墨形态更弯曲细小；基体组织珠光体的片层间距细化，共晶团数量增多；抗拉强度提高了24%，布氏硬度增加了15%左右。钒元素含量增加至0.6 wt.%，抗拉强度最高达到402 MPa。Mo、V复合强化后的灰铸铁，不但综合力学性能得到显著提升，同时兼具良好的导热性能。更多还原

【Abstract】 In order to meet the high performance requirements of automobile engine cylinder block, Mo and V were added into gray cast iron. The microstructure changes were analyzed by OM, SEM and EPMA. The results show that the gray cast iron sample containing 0.5wt.% Mo and 0.3wt.% V, compared with the blank sample,the temperature of the eutectic reaction is lowered, and the graphite morphology is more curved and finer; the matrix structure is lamellar pearlite. The spacing is refined, and the number of eutectic clusters is increased.The tensile strength is increased by about 24%, and the Brinell hardness is increased by about 15%. The vanadium content is increased to 0.6wt.%, and the tensile strength is up to 402 MPa. The gray cast iron strengthened by Mo and V compound not only has a significant improvement in comprehensive mechanical properties, but also has good thermal conductivity.更多还原