Abstract Creep tests were performed for a nickel-base alloy, Ni-16Cr-9Fe, in air, atmospheric CO2, and supercritical-carbon dioxide (S-CO2) at 650 °C. Creep rupture lives in S-CO2 were shorter compared to air and CO2 environments, and the difference was greater at lower applied stress. Combined effects of applied stress and high pressure caused the formation of thicker oxides, which were subjected to extensive cracking and spallation during creep tests in S-CO2. Cracks were found to propagate through the Al- and Ti-rich internal oxides formed at grain boundaries, resulting in reduced creep rupture life in S-CO2 environment.

中文翻译：

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650℃超临界二氧化碳环境下镍基合金的腐蚀蠕变行为

摘要 在空气、大气 CO2 和超临界二氧化碳 (S-CO2) 中，在 650 °C 下对镍基合金 Ni-16Cr-9Fe 进行蠕变试验。与空气和 CO2 环境相比，S-CO2 中的蠕变破裂寿命更短，并且在施加的应力较低时差异更大。外加应力和高压的共同作用导致形成较厚的氧化物，在 S-CO2 中的蠕变试验期间，这些氧化物会受到广泛的开裂和剥落。发现裂纹通过在晶界处形成的富含 Al 和 Ti 的内部氧化物传播，导致在 S-CO2 环境中的蠕变断裂寿命降低。