Microstructure and phase composition of diffusion coating formed in NiCr alloys by hot-dip aluminizing

Шморгун, В. Г.; Богданов, А. И.; Kulevich, V. P.; Исхакова, Л. Д.; Taube, Aleksandr O.

doi:10.1016/j.surfin.2021.100988

Cited by 15 publications

(4 citation statements)

References 43 publications

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“…The energy dispersive analysis results allowed us to confirm the statement that the surface is an aluminum matrix (table 3, point 1). The inclusions distributed in the aluminum matrix, forming an eutectic structure, presumably correspond to the Cr2Al13(Fe,Ni) intermetallic compound (table 3, point 2), the formation of which is typical during the aluminizing of Fe and Ni based alloys alloyed with Cr [7,11]. The layer at the boundary with the substrate corresponds to the FeAl3 intermetallic compound with Cr and Ni dissolved in it (table 3, point 3).…”

Section: Resultsmentioning

confidence: 99%

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Aluminizing of the EP33 alloy by hot-dipping

Kulevich,

Bogdanov,

Shmorgun

2024

J. Phys.: Conf. Ser.

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The features of hot-dip aluminizing of the EP33 alloy were studied and the structure transformation of the resulting coating during high-temperature treatment was investigated. Aluminizing the EP33 alloy leads to the formation of a continuous 120 μm thick coating, consisting of an aluminum matrix with the Cr2Al13 intermetallic compound inclusions and a continuous layer of FeAl3 intermetallic compound along the boundary with the substrate. Heat treatment of the aluminized alloy at 1100 °C ensures the formation of a layered coating structure. The phase composition of the coating from the surface to the substrate changes in the following sequence: FeAl(Ni,Cr,Ti,Mo) → FeAl(Ni,Cr,Ti,Mo)+Ni(Fe,Cr,Al,Ti,Mo) → FeAl(Ni,Cr,Ti,Mo)+Fe(Al,Ni,Cr,Ti,Mo).

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Section: Resultsmentioning

confidence: 99%

“…The main component of such high-temperature corrosion-resistant coatings is aluminum. For the effective and cost-effective formation of aluminide coatings, the hot-dip aluminizing method followed by heat treatment, described in detail in [7,11,12], is often used.…”

Section: Introductionmentioning

confidence: 99%

Aluminizing of the EP33 alloy by hot-dipping

Kulevich,

Bogdanov,

Shmorgun

2024

J. Phys.: Conf. Ser.

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“…For avoiding catastrophic failure, the hot corrosion should be completely avoided or recognized early, and the ultimate failure regarding turbine blades might be caused by a combination of the hot corrosion and an additional failure mechanism (for example, fatigue). While in [22], the researchers discovered that the Ni-based super alloy IN738 had higher creep resistance; nonetheless, the resistance to the oxidations is allo researchers that examined the behavior of Ni-based super alloys. Because of the low chromium content and high tungsten content, CM 247LC is easily corroded.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Investigation of evaluated temperature oxidation for IN-738 LC superalloy turbine blade thermally coated by AL2O3 using slurry coating process

Mousa

Alshadeedi

Attia

et al. 2022

EEJET

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The study aims to investigate the effect of Al2O3 and Al additions to Nickel-base superalloys as a coating layer on oxidation resistance, and structural behavior of nickel superalloys such as IN 738 LC. Nickel-base superalloys are popular as base materials for hot components in industrial gas turbines such as blades due to their superior mechanical performance and high-temperature oxidation resistance, but the combustion gases' existence generates hot oxidation at high temperatures for long durations of time, resulting in corrosion of turbine blades which lead to massive economic losses. Turbine blades used in Iraqi electrical gas power stations require costly maintenance using traditional processes regularly. These blades are made of nickel superalloys such as IN 738 LC(Inconel 738). Few scientists investigated the impact of Al2O3 or Al additions to Nickel-base superalloys as coating layer by using the slurry coating method on oxidation resistance to enhance the Nickel-base superalloy's oxidation resistance. In this study, IN 738 LC is coated with two different coating percentages, the first being (10 Al+90 Al2O3) and the second being (40 Al+60 Al2O3). Scanning Electron Microscope (SEM) and X-Ray Diffraction (XRD) were performed on all samples before and after oxidation. According to the results, SEM images of the surface revealed that the layer of the surface has a relatively moderated porosity value and that some of the coating layers contain micro-cracks. The best surface roughness of specimens coated with 60 % alumina+40 % aluminum was 5.752 nm. Whereas, the surface roughness of specimens coated with 90 % alumina+10 % aluminum was 6.367 nm.Results reveal that alloys with both Al2O3 and Al additions have reported a positive synergistic effect of the Al2O3and Al additions on oxidation resistance. Moreover,the NiCrAl2O3 thermal coating has good oxidation resistance and the effective temperature of anti-oxidation is raised to 1100 °C in turn reducing the maintenance period of turbine blades

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“…An increase in heat and wear resistance of titanium alloys is possible by creating functionally graded intermetallic coatings on their surface based on doped nickel and chromium aluminides [1][2][3][4][5]. For the formation of such coatings at the Department of Materials Science and Composite Materials of the Volgograd state technical university, a technology was proposed that provides for the deposition of a barrier layer of nichrome (Cr20Ni80 alloy) on the surface of titanium (titanium alloy) at the first stage by explosion welding, and at the second stage, aluminizing of the resulting workpiece by immersion in aluminum melt [6]. In this case, it is important to understand the features of the diffusion interaction of titanium alloys and nichrome at elevated temperatures under the conditions of heat treatment of coatings and operational heating.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of diffusion interaction in the Ti-NiCr system layered composites

Богданов¹,

Kulevich²,

Шморгун³

et al. 2023

E3S Web of Conf.

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The results of investigation of the diffusion interaction kinetics at the boundary of explosion welded Ti-NiCr system compositions during heat treatment are presented. The structure, chemical and phase composition of the formed diffusion zones are also studied. It is shown that the layered diffusion zone is formed at a temperature below the eutectoid transformation. Diffusion zone consists of solid solutions based on Ti2Ni, TiNi, and TiNi3 intermetallic compounds, as well as chromium-based solid solution inclusions along the boundary with the NiCr alloy. An increase in temperature above the eutectoid transformation leads to an intensification of the growth of the diffusion zone and the diffusion of nickel into the titanium alloy with the formation of a eutectoid structure in it. The use of alloyed titanium alloys instead of commercially pure titanium does not affect the phase composition of the formed diffusion zones, but slows down the diffusion processes.

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Microstructure and phase composition of diffusion coating formed in NiCr alloys by hot-dip aluminizing

Cited by 15 publications

References 43 publications

Aluminizing of the EP33 alloy by hot-dipping

Aluminizing of the EP33 alloy by hot-dipping

Investigation of evaluated temperature oxidation for IN-738 LC superalloy turbine blade thermally coated by AL2O3 using slurry coating process

Kinetics of diffusion interaction in the Ti-NiCr system layered composites

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