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研究了Fe-Cr-Al-Si轻质耐热钢的组织结构及抗氧化性能,结果表明:铸态的Fe-9Cr-5Al-0.5Si-0.02N-0.03C钢的晶粒直径达到0.5 mm,晶粒粗大的原因主要是原子扩散系数大,晶粒长大速度大,又没有奥氏体铁素体相变的细化晶粒作用。钢在800℃的空气中平均氧化速率为0.0685 g·h~(-1)·m~(-2),达到了完全抗氧化级别;随着氧化温度增加,钢的表面氧化膜由Fe、Al、Cr的化合物、低价态氧化物转变为以Al_2O_3为主的高价态氧化物;氧化膜中Fe_2O_3呈圆圈层规则排列在岛状的Al_2O_3组织上,是由于在高温下铁、铝、氧的复杂的氧化还原反应造成的。
The microstructure and oxidation resistance of Fe-Cr-Al-Si lightweight heat-resistant steel were studied. The results show that the grain size of as-cast Fe-9Cr-5Al-0.5Si-0.02N-0.03C steel reaches 0.5 mm , Coarse grains mainly due to the large atomic diffusion coefficient, grain growth speed, and no austenitic ferrite transformation grain refinement role. The average oxidation rate of steel in air at 800 ℃ was 0.0685 g · h -1 m -2, which reached the level of complete oxidation resistance. With the increase of the oxidation temperature, the surface oxide film of the steel was composed of Fe, Al , Cr compounds, low-cost oxides into Al 2 O 3 -based high valence oxides; the oxide film in the circle of the circle is regularly arranged in the island Al 2 O 3 structure is due to the high temperature iron, aluminum, oxygen Complex redox reaction caused.