The effect of silicon content on the evolution of oxide layer and oxides in Si-containing 9Cr-ODS steel during 5, 20 and 50 h oxidation was studied. The experiment was carried out at 650 °C in air. XRD was used to analyze oxide phase at different oxidation times. The morphology and elemental composition of the oxides were investigated by SEM/EDS. With the silicon content increasing, the oxidation resistance of ODS steel was improved. The oxide layer of 0.5 wt%Si specimen was mainly composed of Fe₂O₃, and the Mn-rich and Cr-rich oxides were found at oxidation 50 h. The Si-rich oxide layer was gradually generated in the 4 wt%Si specimen with the increase of the oxidation times. Meanwhile, a discontinuous Mn-rich and Cr-rich oxide layer was found on the surface of 4 wt%Si specimen steel after 50 h of oxidation. The reason is that the diffusion of Fe³⁺ was prevented by Si-rich oxide layer. Moreover, the diffusion rate of Cr and Mn was increased by a large amount of Si-doped. Consequently, the addition of Si is beneficial to the oxidation resistance of ODS steel.

研究了硅含量对含硅9Cr-ODS钢在5、20和50 h氧化过程中氧化物层和氧化物演变的影响。实验是在650°C的空气中进行的。XRD用于分析在不同氧化时间下的氧化物相。通过SEM / EDS研究了氧化物的形态和元素组成。随着硅含量的增加，ODS钢的抗氧化性得到了提高。0.5 wt％Si试样的氧化层主要由Fe ₂ O _3组成，并且在氧化50 h时发现了富锰和富铬的氧化物。随着氧化时间的增加，在4 wt％Si试样中逐渐生成了富Si氧化物层。同时，氧化50 h后，在4 wt％Si试样钢的表面发现了不连续的富Mn和富Cr氧化物层。原因是富Si的氧化物层阻止了Fe ³⁺的扩散。此外，大量的Si掺杂增加了Cr和Mn的扩散速率。因此，添加Si有利于ODS钢的抗氧化性。