Abstract In this work, the oxidation behaviour of Cu-added 18 %Cr-8%Ni alloy was investigated. A duplex scale with outer Fe3O4 and inner FeCr2O4 layers was formed on the alloy surface. Due to its low oxygen affinity, Cu was ejected and segregated around the Fe3O4/FeCr2O4 interface and the scale/matrix interface during oxidation. Moreover, the supersaturation of Cu at the subsurface facilitated the extensive precipitation of Cu rich particles. As the dislocation shearing of these particles requires higher stress, the major fraction of strain energy was consumed at the subsurface. Thus, crack nucleation and propagation in the oxide scale on Cu-added alloy were suppressed.

中文翻译：

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添加Cu的18%Cr-8%Ni奥氏体合金蒸汽氧化后的氧化开裂行为

摘要 本文研究了添加Cu的18%Cr-8%Ni合金的氧化行为。在合金表面形成了外层 Fe3O4 和内层 FeCr2O4 的双相氧化皮。由于其低氧亲和力，Cu 在氧化过程中被喷射并隔离在 Fe3O4/FeCr2O4 界面和氧化皮/基体界面周围。此外，表面下铜的过饱和促进了富铜颗粒的广泛沉淀。由于这些粒子的位错剪切需要更高的应力，应变能的主要部分在地下消耗。因此，在添加铜的合金上的氧化皮中裂纹的形核和扩展被抑制。