Study of Isothermal Oxidation Behavior of FGH91 Superalloy

Zi Chao Peng; Guo Jun Ma; Xu Qing Wang; Xue Jun Luo

doi:10.4028/www.scientific.net/MSF.816.628

Paper Titles

Effect of Rhenium on Microstructure of Directionally Solidified Ni-Based Superalloys with High Chromium Content
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Microstructure and Element Segregation of Ni-Base Superalloy Casting with Radiation and Liquid-Metal Cooling
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Effects of Co on the Solidification and Precipitation Behaviors of IN 718 Alloy
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Effect of Deformation Conditions on Dynamic Recrystallization of As-Cast GH625 Alloy
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Study of Isothermal Oxidation Behavior of FGH91 Superalloy
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Low Cycle Fatigue Behavior of Several Typical Powder Metallurgy Superalloys
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Effect of Hafnium on the Microstructure and Creep Property of a Hot Corrosion Resistant Superalloy
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Study on Hot Deformation Behavior of Cast-and-Homogenized Superalloy GH706
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Quantitative Phase Field Study on the Precipitation Dynamics of γ′ Phase in Ni-Based Superalloys with Different Concentration
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HomeMaterials Science ForumMaterials Science Forum Vol. 816Study of Isothermal Oxidation Behavior of FGH91...

Study of Isothermal Oxidation Behavior of FGH91 Superalloy

Abstract:

Oxidation behavior of FGH91 superalloy in air and the temperature range of 540 to 980 °C for period up to 100h has been studied. The results indicate that oxidation kinetics obeyed parabolic law, and the activation energy of oxidation was calculated to be 98.2 KJ/mol. The scales on the surface were determined by SEM, EDS and XRD, the results show that the oxidation scales were composed of three layers: the outer layer was composed of Cr₂O₃ layer with a small amount of TiO and NiCr₂O₄ spinel; the intermediate layer was made up of Al₂O₃ and matrix alloy; and a small amount of titanium-nitride disperse in the inner layer. Besides, γ’-free layer was formed under the oxidation scales due to the impoverishment of Al in this layer, which was induced by the formations of Al₂O₃.

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Periodical:

Materials Science Forum (Volume 816)

Pages:

628-633

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.816.628

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Online since:

April 2015

Authors:

Zi Chao Peng*, Guo Jun Ma, Xu Qing Wang, Xue Jun Luo

Keywords:

FGH91 Superalloy, Oxidation Layers, Oxidation Mechanism, γ’-Free Layer

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