High Temperature Intergranular Oxidation of Nickel Based Superalloy Inconel 718

IF 2.1 3区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Oxidation of Metals Pub Date : 2024-07-30 DOI:10.1007/s11085-024-10260-z

Sudhanva Madhusudan, Enrica Epifano, Jérôme Favergeon, Tom Sanviemvongsak, David Maréchal, Daniel Monceau

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Abstract

Intergranular oxidation (IGO) of the Ni-based superalloy Inconel 718 was studied at 650 °C, 700 °C and 900 °C. The oxidized samples were characterized by X-ray diffraction and scanning electron microscopy. For all the studied temperatures, the external scale was mainly composed of Cr₂O₃, while the oxides along the grain boundaries were rich in Al and, to a minor extent, Ti. This was consistent with thermodynamic computations. The time evolution of the maximum depth of IGO was found to be parabolic with an apparent activation energy of 164 kJ/mol. The results of this study confirm with three temperatures that IGO kinetics can be described using an extension of the Wagner’s theory of internal oxidation, as recently suggested in the literature at 850 °C. According to this description, the mechanisms controlling the IGO kinetics of Inconel 718 are the aluminum diffusion in the alloy matrix and the oxygen diffusion along the interface between the alloy matrix and the oxidized grain boundary.

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镍基超合金 Inconel 718 的高温晶间氧化作用

研究了镍基超合金 Inconel 718 在 650 ℃、700 ℃ 和 900 ℃ 下的晶间氧化（IGO）。通过 X 射线衍射和扫描电子显微镜对氧化样品进行了表征。在所有研究温度下，外部鳞片主要由 Cr2O3 构成，而沿晶界的氧化物则富含 Al，少量含有 Ti。这与热力学计算结果一致。研究发现，IGO 最大深度的时间演化为抛物线，表观活化能为 164 kJ/mol。这项研究的结果证实，在三个温度下，IGO 动力学可以用瓦格纳内氧化理论的扩展来描述，正如最近在 850 ℃ 文献中提出的那样。根据这一描述，控制 Inconel 718 IGO 动力学的机制是合金基体中的铝扩散和合金基体与氧化晶界之间界面上的氧扩散。

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来源期刊

Oxidation of Metals 工程技术-冶金工程

CiteScore

5.10

自引率

9.10%

发文量

审稿时长

2.2 months

期刊介绍： Oxidation of Metals is the premier source for the rapid dissemination of current research on all aspects of the science of gas-solid reactions at temperatures greater than about 400˚C, with primary focus on the high-temperature corrosion of bulk and coated systems. This authoritative bi-monthly publishes original scientific papers on kinetics, mechanisms, studies of scales from structural and morphological viewpoints, transport properties in scales, phase-boundary reactions, and much more. Articles may discuss both theoretical and experimental work related to gas-solid reactions at the surface or near-surface of a material exposed to elevated temperatures, including reactions with oxygen, nitrogen, sulfur, carbon and halogens. In addition, Oxidation of Metals publishes the results of frontier research concerned with deposit-induced attack. Review papers and short technical notes are encouraged.