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利用蒸汽氧化试验平台,模拟锅炉运行工况基本相似的高温蒸汽环境,对S31042奥氏体耐热钢进行了650和700℃蒸汽氧化试验。分析了氧化层的形貌、相组成和成分分布,结果表明,随着氧化时间的增长,氧化层厚度明显增加,分层现象明显,可分为内、外两层,外层为疏松多孔结构的富铁氧化物,内层为富铬氧化物;CrO2(OH)2的挥发导致了外层富铁氧化物的形成,(Fe/Cr)3O4内层的形成能够有效减缓蒸汽氧化进程,进入稳态氧化阶段后氧化层厚度将基本保持不变。
The steam oxidation experiment platform was used to simulate the steam environment of S31042 austenitic heat-resistant steel which was basically similar to the operating conditions of the boiler. The steam oxidation test was carried out at 650 and 700 ℃. The morphology, phase composition and composition distribution of the oxide layer were analyzed. The results showed that with the increase of the oxidation time, the thickness of the oxide layer increased obviously and the delamination phenomenon was obvious. It could be divided into inner and outer layers and the outer layer was porous Of iron-rich oxide, the inner layer is chromium-rich oxide; the volatilization of CrO2 (OH) 2 leads to the formation of iron-rich oxide, and the formation of (Fe / Cr) 3O4 inner layer can effectively reduce the process of steam oxidation, After the steady-state oxidation stage, the thickness of the oxide layer will remain basically unchanged.