Cu、Mo对水平连铸球铁型材组织与力学性能的影响

Effects of Cu and Mo on Microstructure and Mechanical Properties of Horizontal Continuous Cast Ductile Iron Profiles

在相同水平连铸条件下,采用合金化方法研究了不同Cu和Mo含量对60mm球铁型材的基体组织与力学性能的影响。结果表明,加入一定量的Cu和Mo元素,可以获得珠光体型球铁组织或奥氏体-贝氏体型球铁,在Mo含量不变时,获得铸态奥氏体-贝氏体基体组织主要是由Cu含量决定。加入Cu和Mo元素后,球铁型材的抗拉强度、屈服强度和硬度均得到较大提高,但冲击韧度明显下降。

Effects of different Cu and Mo contents on microstructure and mechanical properties of horizontal continuous cast ductile iron profiles with 60 mm in diameters were investigated.The results reveal that,with adding Cu and Mo elements,cast ductile iron profiles with pearlite or astenite-bainite structure can be obtained.At a fixed Mo addition,austenite-bainite structure in the cast ductile iron profiles is controlled by Cu content.Tensile strength,yield strength and hardness of the alloy are greatly improved with Cu and Mo addition,however,impacting toughness is slightly decreased.