研究了二种Fe-Cr-Ni系耐热合金添加混合稀土金属前后的高温氧化行为。结果表明,稀土金属可以改善合金的抗高温的氧化能力,其改善程度视合金品种和实验温度而异,随氧化温度升高,稀士的改善作用愈显著。根据实验结果,讨论了稀士金属提高合金抗氧化能力的主要原因。 The oxidation behavior of two kinds of Fe-Cr-Ni heat-resistant alloys before and after the addition of mixed rare earth metals was studied. The results show that the rare earth metal can improve the oxidation resistance of the alloy at high temperature. The degree of improvement depends on the alloy variety and the experimental temperature. With the increase of the oxidation temperature, the improvement effect of the rare metal is more obvious. According to the experimental results, the main reason for improving the anti-oxidation ability of the alloy with rare metals is discussed.