Laser remelting of WC-CoCr surface coated by HVOF: Effect on the tribological properties and energy efficiency

Castro, Richard de Medeiros; Curi, Elvys Isaías Mercado; Inácio, Luiz; Rocha, Alexandre da Silva; Pereira, Milton; Silva, Rafael Gomes Nunes; Pereira, Adriano de Souza Pinto

doi:10.1016/j.surfcoat.2021.127841

Cited by 16 publications

(5 citation statements)

References 87 publications

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“…The beads with the lowest dilution values, without defects and/or discontinuities such as cracks, pores, and detachments at the interface substrate-coating, were pre-selected. In sequence, the acceptance criteria for single bead selection were: 9 height (h0.3 mm), 10 width (w1.0 mm), area, 11 penetration depth (p -lowest possible), and 12 wettability angle (β<less than 90°) to avoid porosity formation when overlapping beads in the subsequent steps. Three of the 24 parameter combinations evaluated were chosen for overlapping stage.…”

Section: Deposition Procedures and Single Bead Parametrizationmentioning

confidence: 99%

“…The addition of different Cr-carbide types in the Nimatrix has demonstrated to be a viable alternative to the conventional replacement of hard-Cr, which is known to cause environmental and health issues [7]. Literature also highlights the use of laser post-processes to improve the properties of these coatings, such as laser remelting (e.g., surface finish enhancement [9], pores, voids and cracks mitigation [10], tribological and corrosion enhancement [11]), laser power modulation [12], and laser surface texturing (e.g., friction coefficient and wear reduction [13], adhesion and corrosion improvement [14]).…”

Section: Introductionmentioning

confidence: 99%

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Tribological performance of Ni-Cr-B-Si coatings deposited via laser cladding process

Sousa¹,

Pereira²,

Silva³

et al. 2022

Surf. Topogr.: Metrol. Prop.

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Ni-Cr-B-Si alloy coatings deposited by the laser cladding process have high tribological resistance, good metallurgical bonding with the substrate, and an interesting set of mechanical properties. Aiming to correlate microstructure and the mechanical behavior of coatings in wear environments, three coatings were deposited over an ASTM A36 carbon steel substrate, them being C1 (1.05 kW-5 mm/s), C2 (1.40 kW-21.7 mm/s), and C3 (1.75 kW-30 mm/s). The microstructure and microhardness of the coatings were analyzed, the former by using SEM and EDS. Ball-on-disk tests were performed to determine wear and friction coefficients. In order to evaluate the worn surfaces, SEM-EDS techniques were also employed. The different solidification rates affected the behavior of microstructure and microhardness. Coating C1, deposited with a lower cooling speed, provided a longer dwell time for the nucleation and growth of Cr-carbides (CrC) in the Ni-matrix, a factor that gave it a lower dilution, higher carbide concentration, and higher microhardness when compared to C2 and C3. In the ball-on-disk test, coatings with higher concentration and CrC size presented a higher variaton of their friction coefficient, but a lower volumetric loss and wear coefficient. Analysis of the worn surfaces showed that the CrC characteristics, deterioration of tribolayers, and coating material detachment close to the solidification cracks were the main features that change the coatings’ tribological performance.

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Section: Deposition Procedures and Single Bead Parametrizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tribological performance of Ni-Cr-B-Si coatings deposited via laser cladding process

Sousa¹,

Pereira²,

Silva³

et al. 2022

Surf. Topogr.: Metrol. Prop.

Self Cite

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“…However, the phase-change-hardening depth of this method is relatively shallow, and the processing allowance reserved for the project is small. In order to improve the depth of the modified area, some scholars use the high energy density of the laser to achieve the rapid heating and solidification of the local area, so as to realize the fine crystallization of the molten area and increase the surface hardness and wear resistance [13][14][15][16][17]. This method can greatly improve the modification depth.…”

Section: Introductionmentioning

confidence: 99%

Simulation Study on the Influence of a Laser Power Change on the Residual Stress of a Laser-Melting RuT300 Valve Seat

Tan,

Pang

2023

Lubricants

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In order to effectively suppress the cracking induced by the excessive residual stress of a laser-melting RuT300 valve seat, the influence of a laser power change on the residual stress was studied by constructing a finite element simulation model of a new power valve seat. The absorption rate of the laser energy on the surface of the material and the change in thermophysical parameters with temperature were taken into account in the model. The results show that the melting and phase-change-hardening areas can be obtained by the laser-melting process. With the increase in laser power, the peak temperature of the molten pool increased almost linearly. The melting zone area and the phase-change-hardening zone depth increased. When the laser power was increased from 2000 to 2600 W, the peak temperature of the laser-melting RuT300 valve seat increased from 2005.09 to 2641.93 °C, the maximum depth of the melting area increased from 0.55 to 0.86 mm, the maximum width of the melting area increased from 3.42 to 4.21 mm, and the maximum depth of the phase-change-hardening area increased from 0.55 to 0.64 mm. The circumferential residual tensile stress in the melting area was much higher than in the radial and axial directions. Along the laser scanning direction, the residual stress in the melting area increased as a whole, and the residual stress in the laser-scanning finishing area greatly increased. With the increase in laser power, the circumferential residual stress at the previous scanning moment decreased, and at the closing moment of the scan, the circumferential residual stress increased with the increase in laser power.

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“…Plasma spraying, a coating technique that combines physical vapor deposition (PVD), chemical vapor deposition (CVD), and slurry processes, is a reliable way to create thick ceramic coatings because of its benefits including a quick processing time and a larger range of spray and base materials [ 13 ]. For the purpose of overcoming structural flaws such as fracture, low adhesion strength, and porosity caused by thermal stress after plasma spraying, a laser can successfully modify the surface of the coating, so as to control the microstructure, reduce porosity, surface roughness, and improve durability [ 14 ]. Laser micromelting is primarily influenced by the laser sintering parameters, the laser beam’s optical characteristics, and the photothermal-mechanical characteristics of the substrate being treated.…”

Section: Introductionmentioning

confidence: 99%

Tuning the Surface Characteristics and Mechanical Properties of Y2O3 Coatings on a Graphene Matrix via Laser Micro Melting

Líu

Chen

et al. 2022

Materials

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The effects of laser parameters on the microstructure and properties of plasma-sprayed yttrium oxide coating on the graphite matrix were investigated. Tensile strength, porosity, roughness, and scratch meter tests were carried out to evaluate the critical load and mechanical properties of the coating after spraying and laser micro-melting. When the porosity and surface roughness of the coating are minimum, the critical load of the coating is 7.85 N higher than that of the spraying surface. After laser micromelting, the crystal phase of Y2O3 coating surface does not change, the crystallinity is improved, and fine grain strengthening occurs. When the laser power density is 75 W/mm2, the scanning speed is 30 mm/s, and the defocusing distance is 40 mm, the film base bonding performance and wear resistance of the material reach the maximum value. The failure of Y2O3 coating is mainly due to the degradation of mechanical properties such as film base bonding strength, surface porosity, and surface roughness, which leads to the local collapse of the material. The coating after laser micro-melting only presents particle disintegration at the end of the scratch area.

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Laser remelting of WC-CoCr surface coated by HVOF: Effect on the tribological properties and energy efficiency

Cited by 16 publications

References 87 publications

Tribological performance of Ni-Cr-B-Si coatings deposited via laser cladding process

Tribological performance of Ni-Cr-B-Si coatings deposited via laser cladding process

Simulation Study on the Influence of a Laser Power Change on the Residual Stress of a Laser-Melting RuT300 Valve Seat

Tuning the Surface Characteristics and Mechanical Properties of Y2O3 Coatings on a Graphene Matrix via Laser Micro Melting

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