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Microstructure and Mechanical Properties of Forged High Yttria 18Cr-ODS Steels
Journal of Materials Engineering and Performance ( IF 2.3 ) Pub Date : 2020-09-18 , DOI: 10.1007/s11665-020-05106-z
Ratnakar Singh , Ujjwal Prakash , Deepak Kumar , Kinkar Laha

Oxide dispersion strengthened (ODS) ferritic steels are candidate materials for clad tubes in the upcoming Generation IV nuclear reactors. In the present work, a powder forging consolidation technique has been used for fabrication of ODS steels. Two alloys having nominal compositions (in weight %) of Fe-18Cr-2W-0.285Ti-0.5Y2O3 and Fe-18Cr-2W-0.571Ti-1Y2O3, respectively, have been studied in this work. The alloys were prepared by mechanical alloying of elemental powders with yttria in a Simoloyer high energy horizontal attritor. The milled powders were consolidated at 1473 K by powder forging in a flowing hydrogen gas atmosphere. Yttria to titanium ratio was kept constant at ~ 1.75 for both the alloys. TEM micrographs of the forged alloys showed fine recrystallized grains with a dispersion of nano-size Y-Ti-O oxide particles. High-resolution transmission electron microscope fringes and the corresponding fast Fourier transformation confirmed the presence of orthorhombic Y2TiO5 oxide particles in a ferrite matrix. These were the predominant oxide particles in the forged alloys. The Y2TiO5 particles were incoherent with the matrix and exhibited a cuboidal morphology. Despite their high yttria content, both the alloys showed high tensile strength and ductility at room temperature and 973 K. Reasons for this are discussed.



中文翻译:

锻制高钇18Cr-ODS钢的组织和力学性能

氧化物弥散强化(ODS)铁素体钢是即将到来的第四代核反应堆中复合管的候选材料。在目前的工作中,粉末锻造固结技术已用于ODS钢的制造。具有Fe-18Cr-2W-0.285Ti-0.5Y 2 O 3和Fe-18Cr-2W-0.571Ti-1Y 2 O 3的标称成分(以重量%计)的两种合金,分别在这项工作中进行了研究。通过在Simoloyer高能水平磨碎机中将元素粉末与氧化钇机械合金化来制备合金。通过在流动的氢气气氛中进行粉末锻造,将研磨后的粉末在1473 K下固结。两种合金的氧化钇与钛之比保持恒定在〜1.75。锻造合金的TEM显微照片显示出细小的重结晶晶粒,并分散有纳米级的Y-Ti-O氧化物颗粒。高分辨率透射电子显微镜条纹和相应的快速傅立叶变换证实了铁素体基体中存在斜方晶Y 2 TiO 5氧化物颗粒。这些是锻造合金中的主要氧化物颗粒。Y 2 TiO 5颗粒与基体不相干,并呈现长方体形态。尽管它们的氧化钇含量很高,但两种合金在室温和973 K下均显示出高的拉伸强度和延展性。对此进行了讨论。

更新日期:2020-09-20
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