目的 研究 T92 钢在 90% Ar +10% H₂O( 均为体积分数) 气氛中 750 ℃ 条件下的氧化行为。 方法 在管式炉中进行高温氧化实验,利用 SEM / EDS 和 XRD 分析氧化膜的形貌、结构和成分。 结果 T92 钢在高温水蒸气环境中,氧化初始阶段的氧化产物为 Fe₂O₃ 和 FeCr₂O₄。 随后的氧化过程中, Fe 快速向外扩散,氧化加速。 最终的氧化膜呈双层结构,内层为 Fe₂O₃ 和 FeCr₂O₄,外层为 Fe₂O₃,氧化层内存在孔洞,且有裂纹。 结论 T92 钢在氧化初期不生成保护性富 Cr 氧化膜,在高温水蒸气环境中的氧化严重。

Objective To investigate the oxidation behavior of T92 steel in 90% Ar + 10% H₂O atmosphere at 750℃ . Methods High-temperature oxidation experiments were conducted in a tube furnace. The morphology, microstructures and composition of oxide films were examined by SEM / EDS and XRD. Results The main oxide was composed of Fe₂O₃ and FeCr₂O₄at the early oxidation stage in high-temperature water vapor environment. Then at the further oxidation stage, Fe ions diffused outwardly, resulting in accelerated oxidation. The oxidation scales consisted of two layers, a porous Fe₂O₃ outer layer and a Cr-rich inner layer. Voids existed in both layers. Some cracks between the inner and outer layers were observed. Conclusion A protective Cr-rich oxide film was not formed in the early oxidation stage. Therefore, T92 steel suffered from oxidation in water-vapor atmosphere at high temperature.