The present work describes the effect of thermo-mechanical treatment on the microstructure, and its subsequent effect on the mechanical properties of Si-containing oxide dispersion strengthened (ODS) reduced activation ferritic (RAF) steel. ODS-RAF steel powder mixture with a nominal composition of Fe-14Cr-2W-0.3Ti-1Si-0.3Y₂O₃ was mechanically alloyed up to 50 h and subsequently consolidated via spark plasma sintering (SPS) at 900 °C followed by thermo-mechanical treatment (TMT) at 850 °C. Microstructural study revealed that the sintered sample consisted of ultrafine grains (0.35 µm) along with nano-size particles (Cr₂TiO₄, SiO_2, and Y₂Ti₂O₇) distributed in the matrix. This sintered sample exhibited excellent mechanical properties such as Vickers hardness (600 VHN), compressive strength (1795 MPa), and total elongation (21%), which is ascribed to the presence of ultrafine grains and nano-size particles. The thermo-mechanically treated sample exhibited an increase in the density by 2.7% and a reduction in the grain size by 23%. Consequently, the Vickers microhardness, compressive strength, and failure elongation of the sintered sample improved by 13%, 37%, and 19%, respectively, upon thermo-mechanical treatment.

目前的工作描述了热机械处理对微观结构的影响，及其对含硅氧化物弥散强化 (ODS) 还原活化铁素体 (RAF) 钢机械性能的后续影响。标称成分为 Fe-14Cr-2W-0.3Ti-1Si-0.3Y ₂ O _{3 的}ODS-RAF 钢粉混合物经机械合金化达 50 小时，随后通过放电等离子烧结 (SPS) 在 900 °C 下固化在 850 °C 下进行热机械处理 (TMT)。微观结构研究表明，烧结样品由超细晶粒 (0.35 µm) 和纳米级颗粒（Cr ₂ TiO ₄、SiO ₂和 Y ₂ Ti ₂ O ₇) 分布在矩阵中。该烧结样品表现出优异的机械性能，如维氏硬度 (600 VHN)、抗压强度 (1795 MPa) 和总伸长率 (21%)，这归因于超细晶粒和纳米尺寸颗粒的存在。经过热机械处理的样品密度增加了 2.7%，晶粒尺寸减少了 23%。因此，经热机械处理后，烧结样品的维氏显微硬度、抗压强度和破坏伸长率分别提高了 13%、37% 和 19%。