Concentrated solar energy for in-situ elaboration of wear-resistant composite layers. Part I: TiC and chromium carbide surface enrichment of common steels

Mourlas, Athanasios; Pavlidou, E.; Vourlias, G.; Rodríguez, J.; Psyllaki, P.

doi:10.1016/j.surfcoat.2019.08.011

Cited by 12 publications

(13 citation statements)

References 27 publications

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“…The second stable carbide phase, chromium carbide, is formed when carbon capture Ti element enough and redundant C remains [21]. Both TiC and Cr 23 C 6 are superior materials that enhance hardness and wear resistance higher than that of a stainless-steel substrate, but TiC had better wear resistance than chromium carbides [22]. Therefore, the spontaneous formation of titanium carbide instead of chromium carbide by adding Ti to multi-component alloy powders, such as HEAs, is important for the properties of the coating layer.…”

Section: Resultsmentioning

confidence: 99%

Microstructural Characterization of TiC-Reinforced Metal Matrix Composites Fabricated by Laser Cladding Using FeCrCoNiAlTiC High Entropy Alloy Powder

et al. 2021

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TiC-reinforced metal matrix composites were fabricated by laser cladding and FeCrCoNiAlTiC high entropy alloy powder. The heat of the laser formed a TiC phase, which was consistent with the thermodynamic calculation, and produced a coating layer without interfacial defects. TiC reinforcing particles exhibited various morphologies, such as spherical, blocky, and dendritic particles, depending on the heat input and coating depth. A dendritic morphology is observed in the lower part of the coating layer near the AISI 304 substrate, where heat is rapidly transferred. Low heat input leads to an inhomogeneous microstructure and coating depth due to the poor fluidity of molten pool. On the other hand, high heat input dissolved reinforcing particles by dilution with the substrate. The coating layer under the effective heat input of 50 J/mm2 had relatively homogeneous blocky particles of several micrometers in size. The micro-hardness value of the coating layer is over 900 HV, and the nano-hardness of the reinforcing particles and the matrix were 17 GPa and 10 GPa, respectively.

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Section: Resultsmentioning

confidence: 99%

Microstructural Characterization of TiC-Reinforced Metal Matrix Composites Fabricated by Laser Cladding Using FeCrCoNiAlTiC High Entropy Alloy Powder

et al. 2021

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“…SEM observations of the worn surface revealed a wear track of ~840 µm width (Figure 14a), within which polishing lines and oxidation areas of the metallic matrix (Figure 14b) can be clearly SEM observations of the worn surface revealed a wear track of~840 µm width (Figure 14a), within which polishing lines and oxidation areas of the metallic matrix (Figure 14b) can be clearly observed, together with the emerged fine carbides dispersion (Figure 14c). Compared to the deposits obtained via the novel CSE technique previously mentioned [27], the friction coefficient values, as well as the wear coefficient and the associated micro-mechanisms, exhibit significant differences originating from the size of the reinforcing TiC particles and their dispersion in the matrix:…”

Section: Performance Of Tic-based Composite Overlayers Produced Via Fmentioning

confidence: 89%

“…Nevertheless, the small diameter of the high-energy beam limits the melting area to a diameter lower than 3 mm, a fact that in turn imposes multiple-step processing of larger surfaces, intensifying the negative effects of high thermal loading. Recently, concentrated solar energy (CSE) was proven [27] an attractive alternative for elaborating such hardfacing layers free of pores and cracks on large dimensional surfaces.…”

Section: Hardfacing Overlayers Elaborated Via Melting and Resolidificmentioning

confidence: 99%

“…observed, together with the emerged fine carbides dispersion (Figure 14c). Compared to the deposits obtained via the novel CSE technique previously mentioned [27], the friction coefficient values, as well as the wear coefficient and the associated micro-mechanisms, exhibit significant differences originating from the size of the reinforcing TiC particles and their dispersion in the matrix: (a) The conventional FCAW deposits, enhanced by TiC particles of finer size, exhibit a rather metallic nature, with high friction coefficient values, tending towards those of a typical tool steel [17] and the relevant wear micro-mechanisms, involving polishing and oxidation of the metallic matrix. (b) The solar surface layers, enhanced by TiC particles of larger size, exhibit the typical nature of a ceramic-particle-reinforced metal (CPRM) composite, with the ceramic phase playing the predominant role in the low friction coefficient values.…”

Section: Performance Of Tic-based Composite Overlayers Produced Via Fmentioning

confidence: 99%

“…Table 3. Ball-on-disk tribological performance of conventional FCAW deposits, compared to CSE overlayers [27].…”

Section: Performance Of Tic-based Composite Overlayers Produced Via Fmentioning

confidence: 99%

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An Introduction to Wear Degradation Mechanisms of Surface-Protected Metallic Components

Psyllaki

2019

Metals

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Despite the fact that ceramics and polymers have found numerous applications in several mechanical systems, metals and metallic alloys still remain the main materials family for manufacturing the bulk of parts and components of engineering assemblies. However, in cases of components that are serving as parts of a tribosystem, the application of surface modification techniques is required to ensure their unhampered function during operation. After a short introduction on fundamental aspects of tribology, this review article delves further into four representative case studies, where the inappropriate application of wear protection techniques has led to acceleration of the degradation of the quasi-protected metallic material. The first deals with the effects of the deficient lubrication of rolling bearings designed to function under oil lubrication conditions; the second is focused on the effects of overloading on sliding bearing surfaces, wear-protected via nitrocarburizing; the third concerns the application of welding techniques for producing hardfacing overlayers intended for the wear protection of heavily loaded, non-lubricated surfaces; the fourth deals with the degradation of thermal-sprayed ceramic coatings, commonly used as wear-resistant layers.

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Formation mechanism of ultrafine M7C3 carbide in a hypereutectic Fe-25Cr-4C-0.5Ti-0.5Nb-0.2N-2LaAlO3 hardfacing alloy layer

Wang

Xing

Zhou

et al. 2020

Journal of Materials Research and Technology

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Concentrated solar energy for in-situ elaboration of wear-resistant composite layers. Part I: TiC and chromium carbide surface enrichment of common steels

Cited by 12 publications

References 27 publications

Microstructural Characterization of TiC-Reinforced Metal Matrix Composites Fabricated by Laser Cladding Using FeCrCoNiAlTiC High Entropy Alloy Powder

Microstructural Characterization of TiC-Reinforced Metal Matrix Composites Fabricated by Laser Cladding Using FeCrCoNiAlTiC High Entropy Alloy Powder

An Introduction to Wear Degradation Mechanisms of Surface-Protected Metallic Components

Formation mechanism of ultrafine M7C3 carbide in a hypereutectic Fe-25Cr-4C-0.5Ti-0.5Nb-0.2N-2LaAlO3 hardfacing alloy layer

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