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研究了蒸汽中的氧含量对263合金蒸汽氧化行为的影响。结果表明:263合金在750℃2种氧含量(1.125×10-6%和3×10-4%)的蒸汽中氧化后生成的氧化层横截面微观形貌相近,均由连续均匀的Cr2O3+Ti O2+(Mn,Fe,Cr)3O4外氧化层和沿晶界和亚晶界呈网状分布的Al2O3+Ti O2内氧化物组成。蒸汽的氧含量增加可使氧化层中的T i O2和(Mn,Fe,Cr)3O4含量明显降低。在低氧含量(1.125×10-6%)蒸汽中生成的氧化层中Ti O2以大颗粒状态存在,而在高氧含量(3×10-4%)蒸汽中生成的氧化层中Ti O2和Cr2O3无法从形态上区分。2种氧含量的蒸汽氧化试验中均未出现铬挥发所致的灾害性氧化。
The effect of oxygen content in steam on the steam oxidation behavior of 263 alloy was studied. The results show that the microstructure of the oxide layer produced by oxidation of the 263 alloy in steam of two kinds of oxygen contents (1.125 × 10-6% and 3 × 10-4%) at 750 ℃ for two kinds of oxygen is similar. Both of them are composed of continuous uniform Cr2O3 + Ti O2 + (Mn, Fe, Cr) 3O4 outer oxide layer and Al2O3 + Ti O2 inner oxide which are distributed in a mesh shape along grain boundaries and subgrain boundaries. The increase of oxygen content in steam can significantly reduce the content of T i O2 and (Mn, Fe, Cr) 3O4 in the oxide layer. In the oxide layer formed in the steam with a low oxygen content (1.125 × 10 -6%) Ti O 2 is present in a large particle state, and in the oxide layer formed in the high oxygen content (3 × 10 -4%) steam Ti O 2 and Cr2O3 can not distinguish from morphology. There was no disastrous oxidation caused by the volatilization of chromium in the two kinds of steam oxidation tests.