Arc enhanced laser melt injection WC particles on Al surface

Li, F Q; Li, L Q; Chen, Y B

doi:10.1179/1743294412y.0000000094

Cited by 12 publications

(5 citation statements)

References 7 publications

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“…In the case of composite traces with SiC powder, the depth ratio of the grain penetration to that of the melting zone was unacceptably small and also melted SiC particles were observed—see Figure 3 . This is in accordance with our own experience and literature data, indicating that the fabrication of a composite layer of the Al-based alloy and SiC materials pair requires the substrate preheating to approximately 300 °C [ 14 , 17 , 23 , 24 ] or enhancement of the laser processing by the tungsten inert gas (TIG) arc method—a technique originally invented for the WC powder [ 28 ].…”

Section: Resultssupporting

confidence: 85%

Wear Resistance Enhancement of Al6061 Alloy Surface Layer by Laser Dispersed Carbide Powders

2020

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In this paper, results of the experimental study on improving wear resistance in sliding friction of Al-based alloy are presented. The technique used involves the formation of a metal matrix composite (MMC) in the alloy surface layer by laser dispersion of carbide powders such as WC, TiC and SiC. For WC and TiC MMC surface coatings fabricated under conditions typical for most of the technologically relevant solid-state lasers (wavelength range of 0.8–1.1 μm), the nearly inversely proportional dependence of the required laser energy density on the powder mass density is observed. Highly homogenous distribution of powder particle content (up to 40%) in the MMC surface coatings of a thickness between 0.8 and 1.6 mm obtained by multiple scanning is observed in the cross-section of specimens processed within a rather narrow parameter window. Tribological tests and comparison to untreated material reveal wear resistance increases by five- and ten-fold, observed in samples with laser-dispersed TiC and WC powders, respectively. Results indicate that substantial modification and reinforcement of the surface layer can be achieved in Al alloy in a one-step process without substrate preheating.

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Section: Resultssupporting

confidence: 85%

Wear Resistance Enhancement of Al6061 Alloy Surface Layer by Laser Dispersed Carbide Powders

2020

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“…But the corrosion resistance of nitrided stainless steels is directly dependent on the nitriding process parameters like duration, nitriding atmosphere composition and the process temperature. The authors state, that the corrosion resistance of stainless steels is reduced at a plasma nitridation temperature above 450 °C (5), 460 °C for AISI 304 stainless steel (6), 475 °C (7) and 480 °C (8,9). Above this temperature occurs the iron and chromium nitrides precipitation (CrN) (8).…”

Section: Introductionmentioning

confidence: 99%

Corrosion Resistance of High Temperature Plasma Nitrided X12CrMoWVNbN10-1-1 Martensitic Stainless Steel

Faltejsek¹,

Kusmič²

2018

ECS Trans.

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The X12CrMoWVNbN10-1-1 martensitic stainless steel was subjected to plasma nitriding at an increased temperature of 550 °C for 15 h and compared to untreated one. The microstructure and microhardness of the untreated and nitrided stainless steel were evaluated. The corrosion properties of the untreated and plasma nitrided steel samples were evaluated using the anodic potentiodynamic polarization tests in neutral 2.5% NaCl deaerated solution. The results showed that plasma nitriding process on the X12CrMoWVNbN10-1-1 stainless steel produced a nitride layer consisting of compound layer and a nitrogen rich diffusion layer. Plasma nitriding process significantly increased the surface hardness of the martensitic stainless steel but also decreased the corrosion resistance of the X12CrMoWVNbN10-1-1 stainless steel. The pitting was evaluated, and the pitting coefficient was calculated. During electrochemical corrosion tests, the nitrided steel showed lower (more negative) corrosion potentials, higher current densities and greatly increased corrosion rates and pitting.

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“…Mechanical and electrochemical properties of laser surface modified titanium alloy for biomedical applications were examined by Khosroshahi et al 13 They showed that the high value of microhardness was resulted, which could be attributed to grain refinement associated with laser melting and rapid solidification. Laser melt injection of WC particles on aluminium surface was studied by Li et al 14 They demonstrated that the powder should be fed from the back side of the laser beam to achieve appropriate surface enhancement effect and the depth of the melt layer increased first and, then, decreased with increasing laser power. Laser processing of TiC reinforced composite layer on Al-Si alloy surface was investigated by Viswanathan et al 15 The findings revealed that the layer was free from pores and TiC and Al-Si phases were almost uniformly distributed in the Ni-Al matrix.…”

Section: Introductionmentioning

confidence: 99%

Laser ablation of phosphor bronze for superhydrophobic surface

Yilbaş

2016

Surface Engineering

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Copper alloys have antibacterial characteristics and improved hydrophobicity of alloy surface minimises the strains left over by the infected fluids, which is vital for hygienic concerns in medical applications. In the present study, laser ablation of phosphor bronze surface is carried out to improve surface hydrophobicity. Morphology and metallurgy of the laser ablated surfaces are characterised using scanning electron microscope, energy dispersive X-ray spectroscopy, and X-ray diffraction. The surface texture is analysed incorporating atomic force microscopy. Surface hydrophobicity is assessed through the contact angle measurements. Residual stress formed in the ablated region is determined using the X-ray diffraction technique and the friction coefficient of the ablated surface is evaluated via scratch tests. The findings reveal that laser ablation of phosphor bronze provides superhydrophobic surface, high hardness, reasonably low residual stresses and low friction coefficient. The average contact angle of 140u is resulted at the laser ablated surface, which is significantly higher than that of as received surface.

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Arc enhanced laser melt injection WC particles on Al surface

Cited by 12 publications

References 7 publications

Wear Resistance Enhancement of Al6061 Alloy Surface Layer by Laser Dispersed Carbide Powders

Wear Resistance Enhancement of Al6061 Alloy Surface Layer by Laser Dispersed Carbide Powders

Corrosion Resistance of High Temperature Plasma Nitrided X12CrMoWVNbN10-1-1 Martensitic Stainless Steel

Laser ablation of phosphor bronze for superhydrophobic surface

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