Oxide-dispersion-strengthened (ODS) steels are important candidate structural materials for the first wall cladding of fusion reactors. In this study, 2–3 mm thick Fe-9Cr alloy thin strip steel (Fe-9.13Cr-0.76W-0.09Y-0.26Zr-0.35Ti-0.06 C) was successfully prepared using a new two-roll thin strip continuous casting technique featuring sub-rapid solidification and continuous forming. The microstructure of the as-cast strip, the composite in the stacked rolled state, and the microstructure and mechanical properties of the high-temperature aged samples after stacked rolling were investigated. The as-cast state was a symmetric microstructure consisting of columnar crystals and double equiaxial crystals with large second-phase precipitates measuring between 50 and 150 nm. The high-temperature aged samples after stacked rolling contained nano-oxides in a density of up to 1.19 x 10²⁴ m^-3 with an average size of 5.4±0.8 nm. The samples heat-treated at 1100℃ exhibited an excellent combination of strong plasticity (833 MPa and 8.6%) with no irradiation-induced swelling observed under irradiation conditions of 450℃ and 200 dpa.

中文翻译：

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Fe-9Cr合金铸带的凝固显微组织分析及其轧制后的力学性能


氧化物分散强化 （ODS） 钢是聚变反应堆首次壁覆层的重要候选结构材料。在本研究中，采用亚快速凝固和连续成型的新型双辊薄带钢成功制备了 2–3mm 厚的 Fe-9Cr 合金薄带钢 （Fe-9.13Cr-0.76W-0.09Y-0.26Zr-0.35Ti-0.06C）。研究了铸态带材的微观组织、堆叠轧制状态下的复合材料以及堆叠轧制后高温时效样品的微观组织和力学性能。铸态是一种对称的微观结构，由柱状晶体和双等轴晶体组成，具有 50 至 150nm 之间的大第二相沉淀物。堆叠轧制后的高温老化样品含有密度高达 1.19 x 10^{24 m-3} 的纳米氧化物，平均尺寸为 5.4±0.8nm。在 1100°C 下热处理的样品表现出优异的强塑性组合 （833MPa 和 8.6%），在 450°C 和 200dpa 的照射条件下未观察到辐照诱导的溶胀。