Abstract The growth of protective α -Al 2 O 3 scales on the NiCrAl-base alloy 602 CA at 1100 °C and 1200 °C was promoted by multi-step oxidation treatments. Different microstructural changes were observed during high temperature exposures in the pre-oxidised specimens as compared to the bare specimens. A coupled thermodynamic-kinetic model was employed to describe the influence of pre-oxidation on the microstructural evolution in the alloy. The model was able to correctly predict the mechanisms of the dissolution and re-precipitation of the carbides in the pre-oxidised and bare specimens.

中文翻译：

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Ni 基合金 602 CA 上的外部 α -Al 2 O 3 氧化皮 – 第二部分：显微组织演变

摘要 多步氧化处理促进了NiCrAl基合金602 CA在1100℃和1200℃下保护性α-Al 2 O 3 氧化皮的生长。与裸试样相比，预​​氧化试样在高温暴露期间观察到不同的微观结构变化。采用耦合热力学-动力学模型来描述预氧化对合金显微组织演变的影响。该模型能够正确预测预氧化和裸试样中碳化物的溶解和再沉淀机制。