Abstract Ni-25Cr alloys alloyed with Fe (5 wt.% and 15 wt.%) and Nb (0, 1 and 2 wt.%) were designed and their oxidation behaviour was evaluated at 1000 °C. Results reveal that alloyed Nb has a positive impact on oxidation in both the kinetics and oxide scale structures. The parabolic rate constant k p of Nb-alloyed Ni-25Cr-15Fe alloys are nearly one-fourth the value for Nb-free alloy. The oxide scales change from spinel-included multi-layers in the Nb-free alloy to a much thinner Cr 2 O 3 single-layer in the Nb-alloyed alloys. NbC precipitates and slightly dissolved Nb account for these changes.

中文翻译：

---

合金Nb对Ni-Cr-Fe合金1000℃空气氧化行为的影响和作用

摘要 设计了含有 Fe（5 wt.% 和 15 wt.%）和 Nb（0、1 和 2 wt.%）的 Ni-25Cr 合金，并在 1000 °C 下评估了它们的氧化行为。结果表明，合金化 Nb 对动力学和氧化皮结构的氧化都有积极影响。Nb 合金化 Ni-25Cr-15Fe 合金的抛物线速率常数 kp 几乎是无 Nb 合金值的四分之一。氧化皮从无 Nb 合金中包含尖晶石的多层变为 Nb 合金中更薄的 Cr 2 O 3 单层。NbC 沉淀和轻微溶解的 Nb 是造成这些变化的原因。