Ferritic steel with oxide dispersion strengthening is a promising material for fusion and fission reactor components. In the present study, the influence of Mo, V, and Zr on microstructural evolution, thermal stability, and mechanical properties of yttria-dispersed ferritic Fe-14Cr-1Ti-0.25Y₂O₃-0.3 wt pct X (X = Mo/V/Zr) steels was investigated. This work is inspired by the concept of MA957 alloy, where Mo was replaced by V/Zr to develop new alloy compositions with possible improvement of thermal stability and mechanical properties through grain refinement and oxide dispersion strengthening. These steels were developed by mechanical alloying (MA) and subsequently consolidated by spark plasma sintering (SPS) at different temperatures (900 °C, 1000 °C, and 1050 °C) in high-purity argon atmosphere. The relative sintered density was found to be ~ 97 to 98 pct for specimens spark plasma sintered (SPSed) at 1050 °C. Microstructural analysis of the SPSed specimens (using scanning electron microscopy/transmission electron microscopy-selected area diffraction (SEM/TEM-SAED)) confirmed the formation of uniformly dispersed Y-Ti-O, TiO, and Ti-Cr-O nanosize complex oxide particles within the ultrafine ferritic matrix grains (~ 200 nm). The nanoindentation hardness value is found to correlate well with the compressive strength and wear resistance of the corresponding batches. The influence of V addition in Fe-14Cr-1Ti-0.25Y₂O₃ alloy is established to yield better thermal stability and superior mechanical properties (nanoindentation hardness of 16.7 GPa, compressive strength of 3068 MPa) as compared to Mo/Zr-stabilized alloys. This was analyzed and discussed in terms of microstructural evolution and strengthening mechanisms involved in comparison to the Mo/Zr-added steels.

具有氧化物弥散强化功能的铁素体钢是用于聚变和裂变反应堆组件的有前途的材料。在本研究中，Mo，V和Zr对分散于氧化钇的铁素体Fe-14Cr-1Ti-0.25Y ₂ O ₃ -0.3 wt pct X（X的微观结构演变，热稳定性和力学性能的影响= Mo / V / Zr）钢。这项工作的灵感来自于MA957合金的概念，其中Mo被V / Zr取代，以开发新的合金成分，并可能通过晶粒细化和氧化物弥散强化来改善热稳定性和机械性能。这些钢是通过机械合金化（MA）进行开发的，然后通过在高纯氩气氛中在不同温度（900°C，1000°C和1050°C）下通过火花等离子体烧结（SPS）进行固结。发现在1050°C下进行火花等离子体烧结（SPSed）的样品的相对烧结密度为〜97至98 pct。对SPSed样品的微观结构分析（使用扫描电子显微镜/透射电子显微镜选择区域衍射（SEM / TEM-SAED））证实形成了均匀分散的Y-Ti-O，TiO，和超细铁素体基体晶粒（约200 nm）中的Ti-Cr-O纳米复合氧化物颗粒。发现纳米压痕硬度值与相应批次的抗压强度和耐磨性良好相关。钒的添加对Fe-14Cr-1Ti-0.25Y的影响与Mo / Zr稳定化合金相比，建立₂ O ₃合金具有更好的热稳定性和出色的机械性能（纳米压痕硬度为16.7 GPa，抗压强度为3068 MPa）。与添加Mo / Zr的钢相比，从微观结构演变和强化机理方面进行了分析和讨论。