Oxidation behaviour of the nickel-based superalloy DZ125 hot-dipped with Al coatings doped by Si

Zang, Junjie; Song, Peng; Feng, Jing; Xiong, Xiping; Chen, Rong; Liu, Guangliang; Lu, Jiansheng

doi:10.1016/j.corsci.2016.07.020

Cited by 41 publications

(9 citation statements)

References 27 publications

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“…The superalloy was cut into disc-shaped specimens (∅17 mm × 3 mm) using a wire electrical discharge machine. The hot-dipping procedure for preparing the aluminide coating was described in detail in our previous study [25]. The post-annealing processes were operated at 850 • C in argon for 24 h to homogenize the microstructure of the coatings.…”

Section: Methodsmentioning

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: Methodsmentioning

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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“…Also, the quality of the promoted coating is improved when the selected withdrawal speed of the specimens was in the range of 3-5 m/min. Most of the researches about the optimization of the hot-dipping process are focused on steels [18][19][20], aluminum [21], titanium [22], and superalloys [23,24]. However, hot-dipping process parameters of copper-base alloys, especially α-brass alloy have not been comprehensively investigated.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive study of the effect of hot-dipping process parameters on Sn-Sb coating properties for α-brass substrate

Barak

Tamizifar

2021

Metall Mater Eng

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This study's main purpose is to achieve an optimal hot-dip coating condition of Sn-Sb for an α-brass alloy. Therefore, the hot-dipping parameters, including pre-flux lubricants, immersion temperature, time, and withdrawal speed were investigated. ZnCl2 and SnCl2 were used as pre-flux bath additives. The temperature of the immersion bath was selected to be in the range of 250-300 °C. Also, the exposing time and withdrawal speed of the specimens during the hot-dipping process were in the range of 10-60 sec and 254-1524 mm/min, respectively. Visual inspection of the coating revealed that by using SnCl2 as a pre-flux additive, high-quality smooth coating is achieved. According to the AFM result, the initial roughness value of the substrate was 450 nm. The coating's roughness value with SnCl2 and SnCl2+ZnCl2 pre-fluxes were in the range of 300-500 and 700-900 nm, respectively. Therefore, ZnCl2 pre-flux is associated with a rougher surface. Corrosion test analysis revealed that both coating condition with different pre-fluxes leads to increasing corrosion resistance however better improvement in corrosion behavior is accomplished by smooth coating surface. The quantitative analysis of the polarization curve revealed that the corrosion rate of the smooth coating is decreased 7-12.5 times in comparison with the substrate. According to the SEM analysis, the predominant phases which were appeared at the interface of the coating and substrate were Cu3Sn and Cu6Sn5. SEM analysis revealed that the Cu3Sn intermetallic compound was this first phase, which was promoted near to the substrate vicinity during the hot-dipping process.

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“…Silicon addition was found as an effective way to improve the oxidation resistance of aluminide coatings. Low oxygen pressure fusing [10], powder pack cementation [12], hot dipping [13], slurry method [14], and hot stamping [15] methods were studied to form Al-Si coatings on different substrate materials to improve oxidation resistance. The formation of an additional oxide phase (SiO 2 ) further benefits the protection of the nickel-based superalloy substrate, by delaying the formation of harmful phases (NiO and γ -Ni 3 Al) [16].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, Fu et al (2014) reported that both coating elements react with nickel and form Ni 2 Si and Ni 3 Al, and the addition of Si promotes the formation of higher Al content NiAl phase (which is favorable to form protective Al 2 O 3 ) from Ni 3 Al [11]. Zang et al also reported that adding silicon helps to form a dense Al 2 O 3 layer, and sets a barrier to oxygen diffusion [13]. Mechanical alloying (MA), also known as mechanical milling, is a solid-state powder mixing and powdered alloy production [17] technique.…”

Section: Introductionmentioning

confidence: 99%

Production and Characterization of Al-Si Coatings Fabricated by Mechanical Alloying Method on Inconel 625 Superalloy Substrates

2021

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Inconel superalloys are used substantially in high-temperature environments. However, these alloys suffer from corrosion and wear. Attempts to overcome these drawbacks involve coating the metal with different techniques and materials. In this study, a new method with increasing potential was utilized. Using the mechanical alloying process in a planetary ball mill vial, alloying and the Al-Si coatings were concurrently achieved on Inconel 625 substrates. Different process control agent (PCA) ratios, milling ball diameters, and milling times were used to improve coating properties. Macro and microstructure, morphology, microhardness, and roughness values of samples were evaluated and compared. Additionally, crystallographic and cross-sectional properties were investigated in order to optimize the processing conditions. The results indicated that increasing the diameter of the grinding ball enhanced the hardness and thickness of these coatings and increased the roughness values. Longer processing time also enhanced the thickness with mechanical values. However, under these conditions, coating homogeneity decreased, and incompatible regions were formed on the coatings. PCA content brought a refined grain structure, hence showed better mechanical properties. On the other hand, processing time should be increased to get a denser and thicker protective layer against the operational conditions.

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Oxidation behaviour of the nickel-based superalloy DZ125 hot-dipped with Al coatings doped by Si

Cited by 41 publications

References 27 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

Comprehensive study of the effect of hot-dipping process parameters on Sn-Sb coating properties for α-brass substrate

Production and Characterization of Al-Si Coatings Fabricated by Mechanical Alloying Method on Inconel 625 Superalloy Substrates

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