Cr、V元素对高硅钼球墨铸铁抗氧化性能的影响

Effects of Vanadium and Chromium Elements on Oxidation Resistance of High Si-Mo Ductile Iron

采用增重法研究了单一添加和复合添加铬、钒元素对高硅钼球铁抗氧化性能的影响。结果表明:在高温氧化过程中,合金单位面积的氧化增重量皆随氧化时间的增长而增多,Si、Cr氧化形成的SiO_(2)薄膜和Cr_(2)O_(3)薄膜均可较好地阻碍氧化性气体的侵入。V元素的添加会削弱Cr元素的抗氧化性能。同时,在合金的氧化层与母材基体区之间都存在一个贫碳层。对比分析表明,单一添加Cr元素对提高高硅钼球铁抗氧化性能的效果最佳。

The effect of single addition and compound addition of chromium and vanadium on the oxidation resistance of high-silicon-molybdenum ductile iron was studied by the weight gain method.The results showed an increase in the gained weight per unit area with the prolongation of exposure time of alloy during the process of high temperature oxidation.This is because SiO_(2) film and Cr_(2)O_(3) film formed due to the oxidation of Si and Cr elements were good barriers to the invasion of oxidizing gas.However,the addition of V element weakened the oxidation resistance of Cr element.At the same time,there was a poor-carbon layer between the oxide layer and the base material matrix area of the alloy.The comparative analysis shows that the single addition of Cr element is the best to improve the oxidation resistance of high-silicon-molybdenum ductile iron.