含稀土高铬铸铁高温氧化行为研究

Study on high temperature oxidation behavior of high chromium cast iron containing rare earth

采用钇基重稀土对高铬铸铁进行微合金化处理,通过对不同稀土含量高铬铸铁的氧化动力学曲线和微观组织进行分析,确定适合该种高铬铸铁抗氧化性的最佳稀土加入量:稀土加入量从0-0.30wt.%,高铬铸铁的氧化速率逐渐降,氧化增重逐渐减小,抗高温氧化性逐渐提高;但当含量超过0.30wt.%时,由于稀土元素的增多,导致夹杂物的增加,从而使高铬铸铁抗氧化性降低,氧化增重出现增大的趋势。

Yttrium-based rare earth was used to microalloy high chromium cast iron. By analyzing the oxidation kinetics curve and microstructure of high chromium cast iron with different rare earth contents, the optimum rare earth addition amount suitable for the oxidation resistance of this high chromium cast iron was determined: when the rare earth addition amount was0-0.30 wt%, the oxidation rate of high chromium cast iron gradually decreased, the oxidation weight gain gradually decreased,and the high temperature oxidation resistance gradually increased. However, when the content exceeds 0.30wt%, the increase of rare earth elements leads to the increase of inclusions, which reduces the oxidation resistance of high chromium cast iron and increases the oxidation weight.