Microstructure and Corrosion Properties of AlCrFeCoNi High-Entropy Alloy Coatings Prepared by HVAF and HVOF

Löbel, Martin; Lindner, T.; Mehner, Thomas; Rymer, Lisa-Marie; Björklund, Stefan; Joshi, Shrikant; Lampke, Thomas

doi:10.1007/s11666-021-01255-2

Cited by 24 publications

(10 citation statements)

References 22 publications

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“…For this study, the concept of porosity is important because the micro-hardness of a coated surface strongly depends on its surface porosity. The inverse relationship between the surface hardness of thermal spray coating and porosity has been reported [35]. To maximize the surface and cross-sectional hardness of the coating, an increase in the degree of densification is necessary.…”

Section: Mechanical Tests 331 Micro Hardness Testingmentioning

confidence: 99%

Influence of laser texturing pre-treatment on HVOF-sprayed WC-10Co-4Cr+GNP coatings on AISI 304

Kumar

Verma

Chauhan

et al. 2022

Surf. Topogr.: Metrol. Prop.

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High-Velocity Oxygen Fuel (HVOF) is one of the most important thermal spraying techniques for protective coating on pristine alloy surfaces by cermet feedstock powders. In the article, grit blasting before HVOF coating is replaced by laser texturing to create specific roughness and deterministic cavities pattern for better mechanical interlocking of deposited WC-10Co-4Cr + 3% Graphene Nanoplatelets (GNPs) on AISI 304 Steel Substrate. Two geometries; first one is Circular texturing (CT) of diameter (d) 100 μm and pitch (p) 120 μm, second is triangular texturing (TT) of side (s) 100 μm and side to side (ss) distance 120 μm have been used. Various testing measures; like surface roughness, XRD analysis, FESEM image analysis, EDS analysis, lattice strain and residual stress, scratch test, Vickers hardness test on coating and base substrate cross-section, and pin-on-disc test for sliding wear behaviour have been performed. After these coating characterizations, it was found that the lattice strain and residual stress decreases significantly, the micro-hardness of the cross-section improved, the adhesion strength of the coating was enhanced and a low sliding wear rate on the coated surface was observed. Uniform distribution of feedstock powder on the surface but higher porosity on the TT surface showed by FESEM image analysis and a large number of cracks observed during scratch tests at higher load.

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Section: Mechanical Tests 331 Micro Hardness Testingmentioning

confidence: 99%

Influence of laser texturing pre-treatment on HVOF-sprayed WC-10Co-4Cr+GNP coatings on AISI 304

Kumar

Verma

Chauhan

et al. 2022

Surf. Topogr.: Metrol. Prop.

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“…Its lamellar structure is typical of thermally sprayed coatings, comprising layers or 'splats' that are created when molten or semi-molten particles impact and flatten against the substrate. This indicates that the HVOF technique effectively softened and propelled the particles, resulting in the creation of overlapping thin layers that enhance the coating's density and mechanical interlocking, thereby improving fracture toughness and cohesion [32].…”

Section: Microstructure Of the Cocrfemnni 08 V Hea Coatingmentioning

confidence: 99%

CoCrFeMnNi0.8V/Cr3C2-Ni20Cr High-Entropy Alloy Composite Thermal Spray Coating: Comparison with Monolithic CoCrFeMnNi0.8V and Cr3C2-Ni20Cr Coatings

Kiape,

Glava,

Georgatis

et al. 2024

Coatings

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High-entropy alloys (HEAs) are revolutionizing the field of surface engineering, challenging traditional alloy frameworks with their superior mechanical attributes and resistance to corrosion. This investigation delves into the properties of the CoCrFeMnNi0.8V HEAs, both as a standalone material and when blended with Cr3C2-Ni20Cr, to evaluate their efficacy as cutting-edge surface treatments. The addition of vanadium to the CoCrFeMnNi0.8V alloy results in a distinctive microstructure that improves hardness and resistance to abrasion. The incorporation of Cr3C2-Ni20Cr particles enhances the alloy’s toughness and longevity. Employing high-velocity oxy-fuel (HVOF) thermal spray methods, these coatings are deposited onto steel substrates and undergo detailed evaluations of their microstructural characteristics, abrasion, and corrosion resistance. Findings reveal the CoCrFeMnNi0.8V coating’s exceptional ability to withstand corrosion, especially in environments rich in chlorides. The hybrid coating benefits from the combination of the HEA’s inherent corrosion resistance and the enhanced wear and corrosion resistance provided by Cr3C2-Ni20Cr, delivering comprehensive performance for high-stress applications. Through the fine-tuning of the application process, the Cr3C2-Ni20Cr reinforced high-entropy alloy coating emerges as a significant advancement in protective surface technology, particularly for use in marine and corrosive settings. This study not only highlights the adaptability of HEAs in surface engineering but also prompts further investigation into innovative material pairings.

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“…This structure suggests that the particles were effectively softened and accelerated by the HVOF process, which led to the formation of thin, overlapping layers upon impact with the substrate. The lamellar structure is beneficial for coating density and mechanical interlocking, contributing to the coating's overall toughness and integrity [25].…”

Section: The Microstructure Of the Cocrfemnni 08 V Hea Coatingmentioning

confidence: 99%

A Comparative Study between a Thermal Spray CoCrFeMnNi0.8V/WC-Co High Entropy Alloy Composite Coating and Plain CoCrFeMnNi0.8V and WC-Co Thermal Spray Coatings

Kiape,

Glava,

Georgatis

et al. 2024

J. Compos. Sci.

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High entropy alloys (HEAs) have emerged as a frontier in surface engineering, challenging the status quo of traditional alloy systems with their exceptional mechanical properties and corrosion resistance. This study investigates the CoCrFeMnNi0.8V HEA, both as a standalone alloy and in a composite with WC-Co, to evaluate their potential as innovative surface coatings. The CoCrFeMnNi0.8V alloy, enriched with vanadium, demonstrates a unique microstructure with enhanced hardness and wear resistance, while the addition of WC-Co particles contributes to improved toughness and durability. By employing High Velocity Oxy-Fuel (HVOF) thermal spray techniques, coatings are deposited onto steel substrates and subjected to rigorous microstructural characterization, wear, and corrosion resistance testing. The results reveal that the CoCrFeMnNi0.8V coating exhibits impressive corrosion resistance in chloride-rich environments. The composite coating leverages the synergy between the HEA’s inherent corrosion resistance and WC-Co’s wear resistance, striking a balance that suits demanding applications. With optimized processing conditions, the composite WC-Co-reinforced high entropy alloy coating could offer a significant advancement in protective coatings technology, especially for maritime and other corrosive settings. This work not only underscores the versatility of HEAs in surface engineering applications but also opens avenues for the development of new material mixtures.

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Microstructure and Corrosion Properties of AlCrFeCoNi High-Entropy Alloy Coatings Prepared by HVAF and HVOF

Cited by 24 publications

References 22 publications

Influence of laser texturing pre-treatment on HVOF-sprayed WC-10Co-4Cr+GNP coatings on AISI 304

Influence of laser texturing pre-treatment on HVOF-sprayed WC-10Co-4Cr+GNP coatings on AISI 304

CoCrFeMnNi0.8V/Cr3C2-Ni20Cr High-Entropy Alloy Composite Thermal Spray Coating: Comparison with Monolithic CoCrFeMnNi0.8V and Cr3C2-Ni20Cr Coatings

A Comparative Study between a Thermal Spray CoCrFeMnNi0.8V/WC-Co High Entropy Alloy Composite Coating and Plain CoCrFeMnNi0.8V and WC-Co Thermal Spray Coatings

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