Comparison of Isothermal with Cyclic Oxidation Behavior of “Cr-Aluminide” Coating on Inconel 738LC at 900 °C

Doolabi, M. Salehi; Ghasemi, Behrooz; Sadrnezhaad, S.K.; Feizabadi, A.; Habibollahzadeh, A.; Doolabi, D. Salehi; AsadiZarch, M.

doi:10.1007/s11085-016-9657-5

Cited by 13 publications

(2 citation statements)

References 44 publications

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“…The element depth profiles show that the Cr content was approximately 40 at.% in the aluminide coating/substrate interface, whereas the Al content immediately decreased from ~59 at.% to ~5 at.% at the interface. Interdiffusion of Cr and Al between the aluminide coating and the substrate occurs simultaneously [28]. Figure 5 shows SEM backscattered cross-sectional views of the samples oxidized in air plus water vapour and in air for 150 h, respectively.…”

Section: Cross-sectional Structure and Chemical Compositionmentioning

confidence: 99%

Destructive Effect of Water Vapour on an In Situ Diffusion Barrier Layer within an Aluminide Coating on IN738 Alloy

Song

Chen

et al. 2018

Coatings

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High-temperature interdiffusion within a hot-dipped aluminide (Al-10 wt.% Si) coating on an IN738 superalloy was investigated at 1050 • C in air and in air plus water vapour. The resulting morphology of in situ diffusion barrier layer (DBL) within the aluminide coating is affected by oxidizing atmospheres; DBL can effectively retard the interdiffusion of aluminium within the coating. The location of the in situ DBL is governed by the partial pressure of oxygen at different depths from the oxide scales in both atmospheres. Meanwhile, the diffusion fluxes of different elements led to DBLs with different morphologies in the aluminide coating on the Ni-based alloy. growth and temperature of the DBL (intermetallic layer) that was formed in Pd/Cu and Pd/Ag porous stainless steel, the DBL formed by the oxidation of the substrate at 430 • C, and the DBL was effective in reducing the intermetallic diffusion at 500 • C. Müller et al. [24] discussed the effects of reactive element oxides and the property of diffusion on a self-forming DBL on nickel-based superalloys, and the DBL was destroyed due to the reaction of Y and Hf from MCrAlY (M = Ni, Co). The above studies indicated that the relationships between the growth, temperatures and reactive element oxides of the DBL, as well as its oxidation resistance, are complex and not yet fully understood at high temperature. Therefore, many factors affect the growth and morphology of the DBL. The relationship between the growth of the DBL and diffusion of elements in different atmospheres requires further study.The purpose of this research was to understand the influence between the in situ DBL and the diffusion of elements during exposure to air and air plus water vapour environment. Moreover, the relationship between the external environment and the growth of DBL has been examined. Coatings 2018, 8, x FOR PEER REVIEW 10 of 11 Author Contributions: Conceptualization, C.L. and P.S.; Methodology, J.L.; Software, X.H.; Validation, K.C., X.Y. and P.S.; Formal Analysis, X.H., K.C. and X.Y.; Investigation, C.L.; Resources, P.S.; Data Curation, J.L.; Writing-Original Draft Preparation, C.L.; Writing-Review & Editing, C.L. and P.S.; Visualization, K.C.; Supervision, P.S. and J.L.; Project Administration, P.S.

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Section: Cross-sectional Structure and Chemical Compositionmentioning

confidence: 99%

Destructive Effect of Water Vapour on an In Situ Diffusion Barrier Layer within an Aluminide Coating on IN738 Alloy

Song

Chen

et al. 2018

Coatings

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“…On the Inconel 738 side, Doolabi et al studied isothermal and cyclic oxidation of Cr-aluminide coating deposited by pack cementation method on Inconel 738LC alloy at 900°C for 350 and 700 h. They observed that a protective Cr2O3 layer formed at the outer layer and the kinetics of oxidation obeys a parabolic rate law [12]. Bai et al studied the isothermal oxidation performance of aluminized Inconel 738LC samples by pack cementation method at 850, 1000, 1100 and 1200°C for 288 h. It was observed that aluminized Inconel 738LC samples showed better oxidation performance even at 1100°C [13].…”

Section: Introductionmentioning

confidence: 99%

Effect of Aluminizing on the Oxidation of Inconel 718 and Inconel 738LC Superalloys at 925-1050°C

Telbakiroğlu,

Konca

2023

Preprint

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A study was undertaken to investigate and compare the high temperature oxidation behaviors of aluminized Inconel 718 and Inconel 738LC nickel-based superalloys. Bare and high activity chemical vapor deposition (CVD) aluminized Inconel 718 and Inconel 738LC samples were oxidized in air at 925, 1000 and 1050°C for 200 hours. Detailed cross-sectional examinations, elemental analyses, mass change measurements, and x-ray diffraction studies were performed. It was observed that the oxidation resistances of both Inconel 718 and 738LC alloys were significantly improved by the Al2O3 layer formed on the NiAl phase that was created on the surfaces of the samples during aluminizing. The beneficial effect of aluminizing was found to be more evident in the case of 738LC alloy samples which showed lower oxidation rates in all test temperatures. It is suggested that the higher aluminum content of the Inconel 738LC alloy, which is 3.43 wt.% vs. 0.49 wt.% in 718, slows down the diffusional flux of Al away from the NiAl phase to the substrate and hence it is the main reason for the superior oxidation resistance of this alloy.

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Oxidation Behavior of Different High-Entropy Alloys Under Static and Cyclic High-Temperature Conditions

Wang,

Li,

Liu

2024

Proceedings of the 63rd Conference of Metallurgists, COM 2024

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Comparison of Isothermal with Cyclic Oxidation Behavior of “Cr-Aluminide” Coating on Inconel 738LC at 900 °C

Cited by 13 publications

References 44 publications

Destructive Effect of Water Vapour on an In Situ Diffusion Barrier Layer within an Aluminide Coating on IN738 Alloy

Destructive Effect of Water Vapour on an In Situ Diffusion Barrier Layer within an Aluminide Coating on IN738 Alloy

Effect of Aluminizing on the Oxidation of Inconel 718 and Inconel 738LC Superalloys at 925-1050°C

Oxidation Behavior of Different High-Entropy Alloys Under Static and Cyclic High-Temperature Conditions

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