Abstract The room temperature tensile properties of Fe-Cr-Si coated C103 alloy are evaluated after cyclic oxidation at 1100–1300 °C for 30–180 min. The strength increased marginally (by 10–20 MPa) after oxidation at 1100 °C, whereas the ductility decreased by ∼50%. Oxidation at 1300 °C for 180 min caused a greater increase in strength (by 10–15%) and deterioration in ductility to 9%. Localized embrittlement of the substrate sub-surface regions in the vicinity of cracks formed in the coating, HfO 2 precipitation at grain boundaries, and intergranular cleavage caused lowering of ductility during cyclic oxidation. Nevertheless, the coating prevented catastrophic oxidation and is indispensable for hypersonic applications.

中文翻译：

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循环氧化对Fe-Cr-Si涂层铌基合金拉伸行为的影响

摘要 Fe-Cr-Si 涂层 C103 合金的室温拉伸性能在 1100-1300 °C 循环氧化 30-180 分钟后进行评估。在 1100 °C 氧化后，强度略有增加（10-20 MPa），而延展性下降了约 50%。在 1300 °C 下氧化 180 分钟会导致强度的更大增加（10-15%）和延展性下降到 9%。涂层中形成的裂纹附近的基底亚表面区域的局部脆化、晶界处的 HfO 2 沉淀和晶间解理导致循环氧化期间延展性降低。然而，涂层防止了灾难性氧化，对于高超音速应用是必不可少的。