Data for: Characterization of Y-bearing particles in CNS-I-ODS steel fabricated by vacuum induction melting & casting technique

Oxide-dispersion-strengthened (ODS) ferrite/martensitic (F/M) steels have been widely considered as the candidate materials for advanced fission reactor's cladding and fusion reactor's blanket due to the excellent irradiation resistance and high temperature creep properties. Vacuum induction melting (VIM) & casting is not a common but a promising approach to produce ODS steel with large volume and high throughput. Meanwhile, the Y-bearing particles in the cast ODS steel presented various chemical compositions and wide size distribution. Thus it is important and necessary to clarify the Y-bearing particle characteristics in the cast ODS steel. In order to determine the distribution characteristics, chemical compositions, crystal structure and size distribution of the Y-bearing particles, CNS-I-ODS was fabricated by adding 1.0 wt.% metallic yttrium into the molten China Nuclear Steel (CNS) during VIM. The results indicated that some banding structures comprised of yttrium oxides and Y-bearing intermetallic compounds formed along rolling direction. XRD, SEM, TEM and EDS demonstrated that yttrium oxides with the size of 550-900 nm were consisted of Y2O3 and Y(O, C) phases while Y-bearing intermetallic compounds with the size of 26-500 nm were consisted of Fe-Y and Y-W-Ta phases. Besides, Y addition also facilitated the formation of δ-ferrite, refinement of prior austenite grains and precipitation of carbides.氧化物弥散强化（Oxide-dispersion-strengthened，ODS）铁素体/马氏体（ferrite/martensitic，F/M）钢凭借优异的抗辐照性能与高温蠕变性能，被广泛视为先进裂变反应堆包壳及聚变反应堆增殖包层的候选材料。真空感应熔炼（Vacuum induction melting，VIM）与铸造工艺虽非常规制备路径，却是实现大体积、高通量制备ODS钢的极具前景的方案。铸态ODS钢中的含钇颗粒呈现出多样的化学成分与宽泛的尺寸分布，因此明确铸态ODS钢内的含钇颗粒特征具有重要的现实意义与必要性。为探明含钇颗粒的分布特征、化学成分、晶体结构及尺寸分布，本研究通过真空感应熔炼工艺，在熔融的中国核用钢（China Nuclear Steel，CNS）中添加1.0 wt.%金属钇，制备得到CNS-I-ODS材料。研究结果表明，沿轧制方向形成了由氧化钇与含钇金属间化合物构成的条带组织。通过X射线衍射（X-ray Diffraction，XRD）、扫描电子显微镜（Scanning Electron Microscope，SEM）、透射电子显微镜（Transmission Electron Microscope，TEM）与能量色散X射线能谱（Energy Dispersive X-ray Spectroscopy，EDS）表征发现：尺寸介于550~900 nm的氧化钇相由Y₂O₃与Y(O,C)相组成，而尺寸为26~500 nm的含钇金属间化合物则由Fe-Y及Y-W-Ta相构成。此外，添加金属钇还可促进δ铁素体的形成、原始奥氏体晶粒的细化以及碳化物的析出。