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Effect of mechanical alloying on the microstructural evolution of a ferritic ODS steel with (Y–Ti–Al–Zr) addition processed by Spark Plasma Sintering (SPS)
Nuclear Engineering and Technology ( IF 2.7 ) Pub Date : 2021-02-10 , DOI: 10.1016/j.net.2021.02.002
E. Macía , A. García-Junceda , M. Serrano , S.J. Hong , M. Campos

The high-energy milling is one of the most extended techniques to produce Oxide dispersion strengthened (ODS) powder steels for nuclear applications. The consequences of the high energy mill process on the final powders can be measured by means of deformation level, size, morphology and alloying degree. In this work, an ODS ferritic steel, Fe14Cr5Al3W-0.4Ti-0.25Y2O3-0.6Zr, was fabricated using two different mechanical alloying (MA) conditions (Mstd and Mact) and subsequently consolidated by Spark Plasma Sintering (SPS). Milling conditions were set to evidence the effectivity of milling by changing the revolutions per minute (rpm) and dwell milling time. Differences on the particle size distribution as well as on the stored plastic deformation were observed, determining the consolidation ability of the material and the achieved microstructure. Since recrystallization depends on the plastic deformation degree, the composition of each particle and the promoted oxide dispersion, a dual grain size distribution was attained after SPS consolidation. Mact showed the highest areas of ultrafine regions when the material is consolidated at 1100 °C. Microhardness and small punch tests were used to evaluate the material under room temperature and up to 500 °C. The produced materials have attained remarkable mechanical properties under high temperature conditions.



中文翻译:

机械合金化对火花等离子烧结 (SPS) 添加 (Y-Ti-Al-Zr) 铁素体 ODS 钢组织演变的影响

的高能研磨是最扩展技术中的一种,以产生直径:西德d ispersion小号trengthened(ODS)钢粉末为核应用。高能研磨过程对最终粉末的影响可以通过变形水平、尺寸、形态和合金化程度来衡量。在这项工作中,ODS 铁素体钢Fe14Cr5Al3W-0.4Ti-0.25Y 2 O 3 -0.6Zr使用两种不同的机械合金化 (MA) 条件(M stdM act),随后通过火花等离子烧结 (SPS) 进行巩固。研磨条件被设置为通过改变每分钟转数 (rpm) 和停留研磨时间来证明研磨的有效性。观察到粒度分布和储存的塑性变形的差异,确定了材料的固结能力和获得的微观结构。由于再结晶取决于塑性变形程度、每个颗粒的组成和促进的氧化物分散,SPS 固结后获得双晶粒尺寸分布。中号行为当材料在 1100 °C 固结时,显示出超细区域的最高面积。显微硬度和小冲头测试用于在室温和高达 500 °C 下评估材料。所生产的材料在高温条件下获得了显着的机械性能。

更新日期:2021-02-10
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