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珠光体含量对球墨铸铁的疲劳性能有显著影响。对三种不同珠光体含量的球墨铸铁的疲劳性能进行了研究 ,测出 QT60 0 - 3、QT70 0 - 2和 QT740 - 3的疲劳强度 ,并绘出了各自的 S- N曲线。结果表明 :球墨铸铁中珠光体含量越高 ,疲劳寿命越长。
The pearlite content has a significant effect on the fatigue properties of ductile iron. The fatigue properties of three ductile irons with different pearlite contents were studied. The fatigue strength of QT60 0-3, QT70 0-2 and QT740-3 were measured and their respective S-N curves were plotted. The results show that the higher the pearlite content in ductile iron, the longer the fatigue life.