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以添加不同硼含量的Fe-Cr-Al合金为试验材料,在1220℃下热处理之后,采用X射线衍射、扫描电镜、能谱分析等方法,研究硼含量对Fe-Cr-Al合金在1220℃下氧化层结构的影响。结果表明,当不含硼时,合金氧化层由外层Fe_2O_3,内层为(Fe_(0.6)Cr_(0.4))_2O_3、(Al_(0.9)Cr_(0.1))_2O_3两层氧化层构成;硼含量为8×10~(-6)时,合金氧化层由外层Fe_2O_3、(Fe_(0.6)Cr_(0.4))_2O_3,内层(Al_(0.9)Cr_(0.1))_2O_3两层氧化层构成;硼含量为18×10~(-6)时,合金氧化层由多层氧化层转变为单层Al2O3层,且局部区域发生氧化失稳,生成瘤状氧化层,存在贯穿性微裂纹。因此为了保证1220℃下合金不生成瘤状氧化层,硼的添加量不应超过8×10~(-6)。
The Fe-Cr-Al alloy with different boron content was used as the experimental material. After heat treatment at 1220 ℃, the effect of boron content on the microstructure of the Fe-Cr-Al alloy was studied by means of X-ray diffraction, scanning electron microscopy and energy spectrum analysis. Under the oxide layer structure. The results show that the oxide layer consists of two layers of oxide (Fe_ (0.6) Cr_ (0.4)) _ 2O_3 and (Al_ (0.9) Cr_ (0.1)) _ 2O_3 in the outer layer of Fe_2O_3, When the content is 8 × 10 ~ (-6), the oxide layer of the alloy consists of two layers of oxide layer, Fe_2O_3, (Fe_ (0.6) Cr_ (0.4)) _ 2O_3 and the inner layer (Al_ (0.9) Cr_ (0.1)) _ 2O_3 When the boron content is 18 × 10 -6, the oxide layer of the alloy changes from multi-layer oxide layer to single-layer Al 2 O 3 layer, and local oxidation instability results in the formation of tumor-like oxide layer with penetrating micro-cracks. Therefore, to ensure that the alloy does not produce a nodular oxide layer at 1220 ° C, the amount of boron added should not exceed 8 × 10 -6.