Abstract The present study examines the cyclic oxidation behaviour at 900 °C in air of sintered 316L austenitic stainless steels containing 1 wt.% yttria or 0.6 wt.% boron. The microstructures of the sintered and oxidized samples were characterised by field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD) analyses. The two-dimensional image analyses of the pore amount, size and shape was correlated with the oxidation rate. The oxidation resistance of the sintered materials is influenced not only by the porosity characteristics but also by the capability of the alloy element or compound to form a more protective oxide scale. For the conditions chosen in this study, the boron-containing steel was found to provide a strong improvement in the high-temperature cyclic oxidation, which appears to be related to both the high densification favoured by the eutectic reaction and the presence of an iron borate. For the yttria-containing steel, the effect of porosity on oxidation rate was suppressed by the presence of oxides containing yttria and chromium.

中文翻译：

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含硼或氧化钇烧结奥氏体不锈钢的高温氧化

摘要 本研究检测了含 1 wt.% 氧化钇或 0.6 wt.% 硼的烧结 316L 奥氏体不锈钢在 900 °C 空气中的循环氧化行为。通过场发射扫描电子显微镜 (FESEM)、能量色散 X 射线光谱 (EDS) 和 X 射线衍射 (XRD) 分析表征烧结和氧化样品的微观结构。孔数量、大小和形状的二维图像分析与氧化速率相关。烧结材料的抗氧化性不仅受孔隙率特性的影响，还受合金元素或化合物形成更具保护性的氧化皮的能力的影响。对于本研究中选择的条件，发现含硼钢在高温循环氧化方面提供了强大的改进，这似乎与共晶反应有利于高致密化和硼酸铁的存在有关。对于含氧化钇的钢，含氧化钇和铬的氧化物的存在抑制了孔隙率对氧化速率的影响。