Aging strengthening treatment of laser cladding Co-based alloy coating

Ouyang, Changyao; Wang, Rui; Bai, Qiaofeng; Chen, Zhi; Yan, Xianguo

doi:10.1016/j.matlet.2022.131746

Cited by 14 publications

(4 citation statements)

References 13 publications

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“…The rapid solidification of laser cladding suppressed the precipitation of carbide and promoted the alloy elements in the solid solution [32]. The microstructure changed greatly after the aging treatment of Cladding layer 5#.…”

Section: Microstructure Evolution Of the Cladding Layermentioning

confidence: 99%

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Failure Analysis of a Chromium Plating Layer on a Piston Rod Surface and the Study of Ni-Based Composite Coating with Nb Addition by Laser Cladding

Wang

Zhang

Shen

et al. 2022

Metals

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The failure of a chromium plating layer on the surface of a piston rod was analyzed, and an Ni-based alloy mixed with a niobium (Nb) composite coating was investigated by means of stereomicroscopy, metallographic microscopy, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), Vickers hardness testing, and wear testing. The results show that penetrating cracks were present in the chromium layer. Subsequently, the corrosion intensified, resulting in the bubbling, cracking, and peeling of the chromium layer. The cladding layer presented a structure morphology of planar crystalline at the bottom, dendritic at the middle, and equiaxial crystalline at the top. The solidification parameters, which were derived from simulation results, confirmed that the ratios between temperature gradient (G) and solidification speed (S) decreased, and the values of the cooling speeds increased from the bottom to the top of the cladding layer. With an increase in Nb content, the structure became gradually refined and uniformly dense. The cladding layer of the Ni-based alloy mixed with Nb was mainly composed of γ-Ni, Cr23C6, Cr7C3, NbC, and Ni3Nb. NbC could be formed in situ and presented itself in four forms: particles, dendrites, polyhedrals, and networks. The microhardness of the coating with 15% added Nb was enhanced to 400 HV0.2, and the wear resistance thereof was 11.14 times higher than the substrate. After the 15% Nb coating had aged for 16 h, the diffraction peak intensities of Cr23C6 and Cr7C3 significantly increased, and the volume fraction of granular NbC increased from 1.67% to 2.54%. The microhardness was enhanced to 580 HV0.2, and the wear resistance thereof was better than that of the chromium plating layer.

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Section: Microstructure Evolution Of the Cladding Layermentioning

confidence: 99%

“…However, when the aging time reached 24 h, the hardness slightly decreased. Such findings could be attributed to the weakening of solid-solution strengthening, the growth of the eutectic structure, and the coarsening of the precipitate [32].…”

Section: Hardness Analysis and Wear Mechanismmentioning

confidence: 99%

Failure Analysis of a Chromium Plating Layer on a Piston Rod Surface and the Study of Ni-Based Composite Coating with Nb Addition by Laser Cladding

Wang

Zhang

Shen

et al. 2022

Metals

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“…Researchers have used lasers to fabricate coatings with different alloy powders, such as Ni-based, Co-based, and Fe-based alloy powders [13][14][15][16][17][18][19], of which the Ni-based alloy powder is widely used due to its advantages. Zhang et al fabricated a Ni60 coating on a 45 steel substrate and investigated the friction and wear behavior of the cladding coating.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ceramic Particles on Ni-Based Alloy Coating Fabricated via Laser Technology

Zhang,

Wang,

Wang

et al. 2023

Lubricants

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Laser cladding is a new technology for fabricating coatings with good properties, such as wear resistance, lubrication, and corrosion resistance. Usually, parts of 45 steel are used as a shaft under conditions of high-speed rotation or friction and wear, and they have a short service life and sometimes cause accidents. In order to avoid serious accidents, a cladding coating made from a Ni-based alloy with ceramic particles was fabricated via laser technology on a substrate of 45 steel in this research. The microstructure and properties were investigated via SEM, EDS, XRD, and a wear and friction tester. The results show that there was an obvious boundary between the cladding coating and the substrate. The main phases were γ(Fe, Ni), WC, TiC, Cr2Ti, and Cr23C6. In the middle of cladding coating, the microstructure was composed of dendrite and cellular crystals, while the microstructure was composed of equiaxial crystals in the bonding region. Inside the cellular crystal, the main phase was γ~(Fe, Ni), which occasionally also showed the appearance of some white particles inside the cellular crystal. Compared with the cellular crystal, the boundary had less of the Fe and Ni elements and more of the Cr and W elements. The amount of C element around the dendrite crystal was more than that around the boundary of cellular crystal due to the long formation time of dendrite. The white particles around the boundary were carbides, such as WC and Cr23C6 phases. Meanwhile, the segregation of the Si element also appeared around the boundaries of the crystal. The maximum microhardness was 772.4 HV0.5, which was about 3.9 times as much as the substrate’s microhardness. The friction coefficients of the 45 steel substrate and Ni-based alloy coating were usually around 0.3 and 0.1, respectively. The Ni-based coating had a smaller coefficient and more stable fluctuations. The wear volume of the cladding coating (0.16 mm3) was less than that of the substrate (1.1 mm3), which was about 14.5% of the wear volume of 45 steel substrate. The main reason was the existence of reinforced phases, such as γ~(Fe, Ni), Cr23C6, and Cr2Ti. The added small WC and TiC particles also enhanced the wear resistance further. The main wear mechanism of the cladding coating was changed to be adhesive wear due to the ceramic particles, which was helpful in improving the service life of 45 steel.

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“…However, the low hardness and poor wear resistance make it easy to wear on the contact surface. Recently, reinforced layers such as Fe-based [1], Ni-based [2], and Co-based [3] coatings were reported to have been fabricated on Al alloy to improve the physical properties, such as tensile strength, corrosion resistance, high-temperature resistance, contact resistance, etc. [4,5], among which Cu alloy has the characteristics of high conductivity, excellent ductility, and good wear resistance [6], which makes it one of the most ideal coatings for Al alloy.…”

Section: Introductionmentioning

confidence: 99%

Crack-Free Copper Alloy Coating on Aluminum Alloy Fabricated by Laser Cladding

Jin,

Lu,

Tang

2023

Coatings

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Crack-free Cu alloy coating has been fabricated on Al alloy substrate with the existence of a Ag buffer layer. The Cu alloy coating had 12 at.% Al and 45 at.% Ag, which contributed to the formation of Cu solid solution and the eutectic phase (transformation temperature 780 °C). The eutectic phase was characterized as finer Cu solid solution and finer Ag solid solution. The Ag buffer layer had the main contents of Ag2Al and Ag solid solution, and it not only hindered the formation of brittle intermetallic compounds (IMCs)but also reduced the thermal stress as its intermediate coefficient of thermal expansion (CTE). Furthermore, the plastic deformation of Ag solid solution in the Ag buffer layer and Cu solid solution in Cu alloy coating also relieved the thermal stress which was generated during the cladding process. All these three aspects inhibited crack generation. And the hardness of the Cu alloy coating increased to approximately 275 HV due to the strengthening effect of Al solid solution, grain boundary within the finer eutectic phase, and nano twin in the Cu solid solution of the eutectic phase.

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Aging strengthening treatment of laser cladding Co-based alloy coating

Cited by 14 publications

References 13 publications

Failure Analysis of a Chromium Plating Layer on a Piston Rod Surface and the Study of Ni-Based Composite Coating with Nb Addition by Laser Cladding

Failure Analysis of a Chromium Plating Layer on a Piston Rod Surface and the Study of Ni-Based Composite Coating with Nb Addition by Laser Cladding

Effect of Ceramic Particles on Ni-Based Alloy Coating Fabricated via Laser Technology

Crack-Free Copper Alloy Coating on Aluminum Alloy Fabricated by Laser Cladding

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