Effect of Bead Overlapping on the Microstructure and Mechanical Properties of CoCrWC Alloy Coatings

Paes, Rodrigo Metz Gabriel; Martinazzi, Douglas; Falcade, Tiago; Scheid, Adriano

doi:10.1590/1980-5373-mr-2018-0274

Cited by 3 publications

(4 citation statements)

References 21 publications

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“…hardness and wear resistance) when a carbide former-containing alloy is deposited on a high-carbon content substrate [3][4][5] . Otherwise, high dilution processing on low carbon substrates usually induces a drop in mechanical properties 3,6,7 . Therefore, the above-mentioned works highlight the importance of material selection for both clad and substrate, once it usually helps to predict coatings microstructure and properties.…”

Section: Introductionmentioning

confidence: 99%

Effect of Laser Power and Substrate on the Hastelloy C276TM Coatings Features Deposited by Laser Cladding

et al. 2020

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Laser power influences the range of dilution with the substrate and thus, the microstructure and properties of the coatings. This work evaluated the effect of laser power on the dilution, microstructure, hardness and wear behavior of Hastelloy C276 TM alloy coatings deposited on AISI 304L stainless steel and GGG40 ductile iron. The microstructure was comprised of γ (Ni-FCC) dendrites and molybdenum-rich interdendritic regions containing carbides. The coatings showed similar second phase nature and fraction and equivalent hardness and wear behavior for the lowest laser power condition. Otherwise, higher power on 304L induced to a lower fraction of blocky-like M 23 C 6 /MC carbides; whilst on GGG40 led to a higher fraction of a predominantly lamellar M 6 C type carbide. Largely diluted coatings on ductile iron entailed differences in the strengthening mechanisms which led to higher hardness and lower wear rate. Moreover, wear tracks showed surface oxidation which in turn negatively influenced the performance of specimens with low dilution on both substrates. On the other way, with high dilution, this feature was only observed on stainless steel.

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Section: Introductionmentioning

confidence: 99%

Effect of Laser Power and Substrate on the Hastelloy C276TM Coatings Features Deposited by Laser Cladding

et al. 2020

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“…The experimental setup used for this work consists of a high-power diode laser (HPDL) of type SL8600 (co. Preco Inc.) connected to a three-axis CNC table as a positioning device and a powder feeder with a mechanical wheel as a transport unit. Considering previous studies, the process parameter laser power L P , travel speed v, focal distance d F , laser spot size d L , shielding gas flow _ V SG , nozzle angle a N , feeding rate _ m P and forming gas flow _ V FG were chosen ( 22). Single-and multi-beads were deposited on an 80 mm straight path with the substrate initially at room temperature.…”

Section: Process Setupmentioning

confidence: 99%

Coaxial Laser Cladding of Cobalt-Base Alloy Stellite™ 6 on Grey Cast Iron Analysis of the Microstructural and Mechanical Properties Depending on the Laser Power

Kiehl

Scheid

Graf

et al. 2022

J. of Materi Eng and Perform

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A high-power diode laser was used to generate single- and multi-bead coatings of Stellite™ 6 by coaxial laser cladding over flat grey cast iron (EN-GJLP-200) as a preliminary study to develop a wear and corrosion resistant coating for brake disks on a cost-effective substrate. In this article, we have focused on a detailed quantitative analysis of the effect of different laser powers (1.5, 2.0, 2.5, 3.0, 3.5, and 4.0 kW) on the bead geometry, dilution, microstructure, and hardness. Coatings dilution or composition depends directly on the laser power as well as bead geometry. The typical microstructure of the coatings comprises a solid solution of α (hcp)- and β (fcc)-Co with a dendritic structure as a metal matrix and an interdendritic lamellar eutectic, which contains predominantly β-Co, chromium carbides Cr7C3 and Cr23C6 as well as blocky tungsten carbide W2C. Coating hardness depends on the chemical composition and microstructure that is modified by the deposition parameters. Low laser power results in high carbide fraction and most refined microstructures, accounting for harder coatings.

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“…Otherwise, the deposition onto high-carbon substrates may lead to a significant increase in the coatings wear resistance 13,14 . Therefore, some works revealed the possibility of coating design by cladding with substrate material selection and dilution control [12][13][14][15][16][17][18] while many others indicated, as a research opportunity, the processing of composite coatings by laser cladding [2][3][4][5][6][7][8][9][10] . The latter involves an even more intricate task because of the need to select and manage the clad alloy, reinforcement particle type, and its amount, substrate, and laser processing parameters 19,20 .…”

Section: Introductionmentioning

confidence: 99%

“…Figure18. The hardness of composite coatings versus laser power and NbC feeding rate.Figure 19.Wear rate of the composite coatings versus laser power and NbC feeding rate.…”

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confidence: 99%

Microstructure and Wear Behavior of NbC-Reinforced Ni-Based Alloy Composite Coatings by Laser Cladding

et al. 2021

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This work aims to evaluate the influence of laser power and reinforcement feeding rate on the microstructure, hardness, and wear behavior of NbC-reinforced Hastelloy C276 TM alloy composite coatings. From a dual feeding system, one-step metal-matrix composite coatings were deposited with 10, 30, and 50% mass feeding of NbC powder with laser powers of 1.5 and 3.0 kW. Coatings deposited with 1.5 kW and 30% NbC showed some degree of porosity due to a combination of NbC feeding rate and melting pool temperature. Laser power and NbC feeding rate altered the melting efficiency and substrate burn-in shape, remarkably influencing the dilution. The composite microstructure was comprised of Ni-γ (FCC) dendrites with interdendritic network carbide which, in turn, ranged from lamellar-like M 6 C to blocky-like conjugated MC-M 23 C 6 carbide. Primary petaloid-like MC [Nb] carbide was formed from a 30% reinforcement rate on, whilst a considerable number of unmelted particles was observed for 50%. The higher the reinforcement feeding rate, the higher the carbide fraction and better wear performance of low heat-input specimens. Synthesis with high heat-input sheds a light on the deleterious effect of the dilution and is not an option to enhance the wear performance.

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Effect of Bead Overlapping on the Microstructure and Mechanical Properties of CoCrWC Alloy Coatings

Cited by 3 publications

References 21 publications

Effect of Laser Power and Substrate on the Hastelloy C276TM Coatings Features Deposited by Laser Cladding

Effect of Laser Power and Substrate on the Hastelloy C276TM Coatings Features Deposited by Laser Cladding

Coaxial Laser Cladding of Cobalt-Base Alloy Stellite™ 6 on Grey Cast Iron Analysis of the Microstructural and Mechanical Properties Depending on the Laser Power

Microstructure and Wear Behavior of NbC-Reinforced Ni-Based Alloy Composite Coatings by Laser Cladding

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