中文摘要：

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Fe3O3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。

英文摘要：

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 FeCr2O4 at the early oxidation stage in high-temperature water vapor environment. Then at the further oxidation stage, Fe ions diffused outwardly, resulting in accel- erated 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, 392 steel suffered from oxidation in water-vapor atmosphere at high temperature.