High-Temperature Corrosion Behaviour of Aluminized-Coated and Uncoated Alloy 718 Under Cyclic Oxidation and Corrosion in NaCl Vapour at 750 °C

Koech, Pius Kibet; Wang, Chaur Jeng

doi:10.1007/s11085-018-9865-2

Cited by 15 publications

(3 citation statements)

References 46 publications

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“…By this way, penetration of oxygen to the nickel-based superalloy substrate is slowed down and hence its service life is improved. In literature, there are various methods to produce an aluminide coating such as pack aluminizing [8], high and low activity aluminizing by chemical vapour deposition [7], [3], slurry aluminizing [9] and hot dip aluminizing [10]. Each method produces different microstructures with characteristic properties which affect the service life of the substrate significantly.…”

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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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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“…In particular, dip coating technologies have been studied to investigate formation of nickel-aluminides on nickelbased superalloys and their effects on surface properties [15][16][17]. Yet, there are still several reasons to investigate high temperature tribological behavior of hotdip aluminizing coatings on nickel-based superalloys that need to be fully clarified.…”

Section: Introductionmentioning

confidence: 99%

high Temperature WEAR behavıor of hot-dıp alımınızed ınconel 718

KAVUKCU

Kaba

Muhaffel

et al. 2022

METAL 2022 Conference Proeedings

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Superalloys are used in a wide range of applications in aviation, aerospace and nuclear energy industries. Inconel 718 is a nickel-based superalloy that provides remarkable mechanical properties and surface stability at elevated temperatures. The surface of Inconel 718 can be modified by several techniques to further improve its surface properties such as oxidation and wear resistance. Among several surface modification techniques, hot-dip aluminizing (HDA) is a highlighted one as an easy and cost-effective high temperature coating (HTC) technique that utilize diffusion mechanisms. In this study, effect of HDA and subsequent diffusion annealing (DA) on high temperature wear behavior of Inconel 718 superalloy was investigated. Inconel 718 samples were first hot-dip aluminized in a molten Al-12wt.%Si bath and subjected to diffusion annealing. Morphological and structural analyses were carried out by using SEM-EDS examinations and XRD analyses. Ball-on-disc wear tests of the bare, HDA and HDA+DA samples were conducted at room temperature, 300 °C and 600 °C. The results revealed that aluminum rich and nickel rich aluminide phases were formed after HDA and HDA+DA processes, respectively. Wear tests results showed that the wear rate of the HDA+DA sample was approximately three times lower than the HDA samples and four times lower than the bare Inconel 718 at room temperature. With increasing temperature, the wear rate of the bare alloy continuously decreased, while higher wear rates were observed for HDA+DA samples at elevated temperatures with respect to that of room temperature. Dominant wear mechanism was discussed based on the wear track morphology examined by SEM.

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“…Many research centers performs research related to the oxidation of materials [7][8][9][10][11][12][13][14][15][16][17][18][19][20], especially metallic materials [21][22][23][24]. Corrosion is an issue of high interest to scientists [25][26][27][28][29][30]. In particular, the problem of high-temperature corrosion is particularly important in the case of long-term elements operation in power stations or combined heat and power stations [9,21,[31][32][33][34][35][36][37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Surface morphology analysis of oxide layers formed on 10CrMo9-10 steel used in the power industry

Gwoździk

Bramowicz

Kulesza

2020

Mater. Res. Express

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The knowledge about high-temperature corrosion of steels operating at elevated temperatures is important due to the durability of power equipment. The paper demonstrated the fractal analysis of oxide layers formed on 10CrMo9-10 steel under the operating temperature of 545°C for 200 000 h employed in the power industry. The studies were carried out on elements taken from the inner and outer surface of the tube wall on the outlet both on the fire and counter-fire side of the tube wall surface. Thorough examinations of the oxide layer comprised microscopic examinations using scanning electron microscopy and atomic force microscopy. The fractal geometry of oxidized surfaces was characterized by providing the fractal dimension D. Using the methods of numerical analysis of the surface, the texture anisotropy ratio S tr was also determined. The corner frequency τ and grain size d g were also determined. The obtained results of performed fractal analysis showed that the studied surface on the tube wall outside was more developed as compared with the inside. In addition it was shown that directly on the flue gas inflow side (the fire side) the oxides/deposits layer was built of densely arranged spherical deposits, which formed an unfavourable barrier between the component (tube) and the atmosphere surrounding it. metal OPEN ACCESS RECEIVED

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High-Temperature Corrosion Behaviour of Aluminized-Coated and Uncoated Alloy 718 Under Cyclic Oxidation and Corrosion in NaCl Vapour at 750 °C

Cited by 15 publications

References 46 publications

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

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

high Temperature WEAR behavıor of hot-dıp alımınızed ınconel 718

Surface morphology analysis of oxide layers formed on 10CrMo9-10 steel used in the power industry

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