用扫描电镜研究了珠光体和铁素体比例不同的球墨铸铁在不同AK值下,疲劳断裂机制的变化规律,并制作了疲劳裂纹扩展机制图。结果表明:铁素体的机制为T,I→S,I→S→S,D,珠光体的机制为T,S→C,S,含牛眼铁素体的球铁的机制为T,I→S,I→S,D,并讨论了转变条件与组织性能的关系,及60％铁素体的球铁晶间断裂比例最高的原因。
The fatigue crack propagation mechanism (FCPM) in the nodular graphite cast iron of different microstructures with various proportions of pearlite and ferrite at distinct ΔK levels has been studied by SEM so as to construct their own FCPM charts. The FCPM of the ferritic nodular cast iron is shown to be: transgranular and intergranular fracture→striation and intergranular fracture→striation→striation and dimple rupture; that of pearlitic one to be: transgranular fracture and striation→striation and cleavage fracture; and that of one containing bull's eye ferrite to be: transgranular and intergranular fracture→striation and intergranular fracture→striation and dimple rupture. The correlation between the transition of FCPM and structure or properties as well as the reason why the highest percentage of intergranular fracture observed in the nodular cast iron with 60% ferrite have also been discussed.
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