This work investigated the high-temperature oxidation kinetics and evolution of oxide phases of as-fabricated (AF) and heat-treated (HT) Inconel 718 alloys in air fabricated by the wire-arc additive manufacturing process. The results showed that the oxidation kinetics of all samples followed the parabolic time dependence. The microstructural study revealed the formation of very similar oxide scales in both AF and HT conditions. The oxide surface was found to be a mixture of complex spinel-MnCr₂O₄ and rutile-TiO₂ phases. The cross-sectional view yielded an outer layer of protective Cr₂O₃ scale, an inner layer of Nb-rich Ti_0.67Nb_1.33O₄ oxide and discretely formed internal Al₂O₃ oxides. The mechanism of scale formation is suggested on the basis of thermodynamic and kinetic abilities of cationic species.

这项工作研究了通过电弧电弧添加制造工艺制造的空气中制成的（AF）和热处理（HT）Inconel 718合金的高温氧化动力学和氧化物相的演变。结果表明，所有样品的氧化动力学都遵循抛物线时间依赖性。微观结构研究表明，在AF和HT条件下均会形成非常相似的氧化皮。发现氧化物表面是复杂的尖晶石-MnCr ₂ O ₄和金红石-TiO ₂相的混合物。横截面图产生了保护性Cr ₂ O ₃氧化皮的外层，富Nb的Ti _0.67 Nb _1.33 O _4的内层氧化物和离散形成的内部Al ₂ O ₃氧化物。根据阳离子物种的热力学和动力学能力，提出了水垢形成的机理。