The isothermal oxidation behavior and oxide-scale evolution on a newly developed Ni–Fe-based superalloy were investigated. Three oxidation stages were generally observed, an initial stage of rapid mass gain, then a second stage of parabolic kinetics, followed by an equilibrium period after about 50, 75, and 100 h at 1000, 1100, and 1200 °C, respectively. Cr2O3 and NiAl2O4 play an important role in protecting the matrix from oxidation at 1000 °C. The chromium supply becomes insufficient to support the continuously growing chromia scale with the increased oxidation temperature. Ultimately, the high-temperature oxidation resistance mainly depends on the formation of the inner continuous α-Al2O3 oxide layer. The quick formation of continuous α-Al2O3 oxide layer at 1200 °C compared to that at 1100 °C leads to a significantly reduced parabolic rate constant, which indicates that the new Ni–Fe-based superalloy has excellent oxidation resistance properties at higher temperatures.Graphical Abstract

中文翻译：

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一种新型 Ni-Fe 基高温合金在高温下的氧化皮演化

研究了新开发的 Ni-Fe 基高温合金的等温氧化行为和氧化皮演变。通常观察到三个氧化阶段，一个是快速质量增加的初始阶段，然后是抛物线动力学的第二阶段，然后分别在 1000、1100 和 1200 °C 下约 50、75 和 100 小时后达到平衡期。Cr2O3 和 NiAl2O4 在保护基体免受 1000 °C 氧化方面起着重要作用。随着氧化温度的升高，铬供应变得不足以支持不断增长的氧化铬水垢。最终，高温抗氧化性主要取决于内部连续α-Al2O3氧化层的形成。