The influence of Y2O3 concentration on the microstructure and oxidation performance of FeCrAl-ODS alloy manufactured by selective laser melting

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2025-03-22 DOI:10.1016/j.jallcom.2025.179949

Shenghua Zhang, Fudong Li, Yu Xie, Zhonghua Li, Yu Wang, Shengtong He, Bin Liu

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引用次数: 0

Abstract

This study investigates the influence of Y₂O₃ concentration on the microstructure and oxidation performance of selective laser melted (SLM-ed) FeCrAl-ODS alloys. Three FeCrAl-ODS alloys with varying Y₂O₃ contents were designed, and their microstructures were characterized. Oxidation experiments were conducted at 1000 °C in air. The results indicate that FeCrAl0.7Y exhibited fine grain size and high interior strain due to the nucleation-promoting and grain boundary-pinning effects of Y₂O₃ particles. After 225 hours of oxidation, FeCrAl0.1Y demonstrated the lowest oxidation mass gain and excellent oxide scale adhesion. Dense and compact Al₂O₃ scales formed on the surfaces of SLM-ed FeCrAl alloys with Y₂O₃ additions. Y enrichment at the Al₂O₃ oxide grain boundaries inhibited outward cation diffusion, shifting the Al₂O₃ scale growth mechanism from a bidirectional mechanism driven by metallic element diffusion and inward oxygen diffusion to a columnar grain growth mechanism dominated by inward oxygen diffusion. This change impeded the growth rate of oxide scale. However, excessive Y accelerated oxide film development. The presence of Y improved the adhesion of the oxide film on the SLM-ed FeCrAl-ODS alloys.

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Y2O3浓度对选择性激光熔制feral - ods合金显微组织和氧化性能的影响

研究了Y₂O₃浓度对选择性激光熔化（SLM-ed） FeCrAl-ODS合金显微组织和氧化性能的影响。设计了3种不同Y₂O₃含量的fecal - ods合金，并对其微观组织进行了表征。氧化实验在1000℃的空气中进行。结果表明，由于Y₂O₃颗粒的促核和固晶界作用，FeCrAl0.7Y具有细小的晶粒尺寸和较高的内部应变。经过225小时的氧化，FeCrAl0.1Y表现出最低的氧化质量增益和优异的氧化垢附着力。密集和紧凑的Al₂O₃在SLM-ed FeCrAl合金表面上形成了带有Y₂O₃添加剂的鳞片。Al₂O₃氧化物晶界处的Y富集抑制了阳离子向外扩散，使Al₂O₃垢体的生长机制由金属元素扩散和氧向内扩散驱动的双向机制转变为氧向内扩散主导的柱状晶粒生长机制。这种变化阻碍了氧化皮的生长速度。然而，过量的Y会加速氧化膜的形成。Y的存在提高了氧化膜在SLM-ed fecr - ods合金上的附着力。

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来源期刊

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.