Influence of Cu on microstructure and wear resistance of TiC/TiB/TiN reinforced composite coating fabricated by laser cladding

The synthesis of hard composite coating on titanium alloy by laser cladding of Al/Fe/Ni+C/Si3N4 pre-placed powders has been investigated in detail. SEM result indicated that a composite coating with metallurgical joint to the substrate was formed. XRD result indicated that the composite coating mainly consisted of γ- (Fe, Ni) , FeAl , Ti3Al , TiC , TiNi , TiC0.3N0.7 , Ti2N , SiC , Ti5Si3 and TiNi . Compared with Ti-3Al-2V substrate, an improvement of the micro-hardness and the wear resistance was observed for this composite coating.

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Research on Microstructure and Hardness of Laser Cladding Using the Mixed Powder of Nano-TiC and Ni-Based Alloy

Materials Science Forum ◽

10.4028/www.scientific.net/msf.976.9 ◽

2020 ◽

Vol 976 ◽

pp. 9-14 ◽

Cited By ~ 1

Author(s):

Wei Zhang ◽

Qiu Hong Feng ◽

Wei Zhong Zhang

Keyword(s):

Solid Solution ◽

Wear Resistance ◽

Composite Coating ◽

Laser Cladding ◽

High Speed ◽

Scanning Speed ◽

Mixed Powder ◽

Reinforced Composite ◽

Average Hardness ◽

Cladding Material

Aiming at the problem of poor high-temperature wear-resistance of rope clamp used in super-high speed elevators, the experiments of laser cladding to prepare carbide reinforced composite coating were made. nanoTiC powder, Ni-based alloy powder were used as cladding material. The microstructure and hardness of composite coating were tested by relevant equipments. The research results show that the composite coating is made up of TiC, Cr3C2, Fe3C and Fe-Ni-Cr-C HYPERLINK "javascript:void (0);" solid solution. When the content of TiC is 10%, 30%, the morphology of TiC is presented as dendrite-like and the morphology of HYPERLINK "javascript:void (0);" solid solution is presented as cellular-like. When the content of TiC is 50%, the morphology of TiC is presented as block-like, lath-like. There are some microcracks on grain boundaries. At the content of 30%, laser power 1.5KW, scanning speed 600mm/min, the laser cladding has no crack and hole. The average hardness of composite coating is 701HV0.2. Using this technology to the surface strengthening of elevator parts, the wear resistance and service life can be greatly improved.

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Microstructure evolution and properties of a laser cladded Ni-Based WC reinforced composite coating

Materials Testing ◽

10.1515/mt-2020-621104 ◽

2020 ◽

Vol 62 (11) ◽

pp. 1078-1084

Author(s):

Dang Kaifang ◽

Jiang Zhiqiang

Keyword(s):

Wear Resistance ◽

Fiber Laser ◽

Dilution Rate ◽

Composite Coating ◽

Laser Cladding ◽

Mass Fraction ◽

X Ray Diffraction ◽

Cladding Layer ◽

Reinforced Composite ◽

Average Hardness

Abstract Laser cladding Ni-based WC reinforced composite coating was fabricated on the surface of Q235 steel using 6 KW fiber laser. The morphology, composition, microhardness and wear resistance of the composite coating at varied contents of WC particles were studied using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), microhardness tester and a wear tester. The results show that the dilution rate of the cladding layer decreases first and then increases with an increase of WC content. When the WC content is 20 wt.-%, the dilution rate is the smallest. In the process of fiber laser cladding Ni-based WC reinforced composite coating, WC particles partially dissolve and interact with other elements to form eutectics, which exist as lumpy shapes, strips and as spherical shapes. By increasing the WC content, the structure of the cladding layer appears to be refined. The main phases of the laser cladding layer are γ-Ni, M7C3, M23C6, CrB, WC and W2C. As the WC content increases, the hardness of the cladding layer increases. When the WC mass fraction reaches 40 wt.-%, the average hardness of the composite coating can be more than five times the substrate. When the mass fraction of WC is 20 wt.-%, the wear resistance of the cladding layer is best, which is more than three times that of Ni60A coating.

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MICROSTRUCTURES AND DRY SLIDING WEAR RESISTANCE OF THE LASER CERAMICS COMPOSITE COATING ON PURE Ti

Surface Review and Letters ◽

10.1142/s0218625x12500175 ◽

2012 ◽

Vol 19 (03) ◽

pp. 1250017 ◽

Cited By ~ 4

Author(s):

PENG LIU ◽

YUANBIN ZHANG ◽

HUI LUO ◽

YUSHUANG HUO

Keyword(s):

Wear Resistance ◽

Composite Coating ◽

Laser Cladding ◽

Dry Sliding Wear ◽

X Ray Diffraction ◽

Phase Constituent ◽

Fine Grain ◽

Fine Grain Strengthening ◽

Modification Technique ◽

Surface Performance

In this study, Al–Ti–Co was used to improve the surface performance of pure Ti . Laser cladding is an important surface modification technique, which can be used to improve the surface performance of pure Ti . Laser cladding of the Al–Ti–Co + TiB2 pre-placed powders on pure Ti can form ceramics reinforced the composite coating, which improved the wear resistance of the substrate. Characteristics of the composite coating were investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), microhardness and wear tests. And the laser-cladded coating can also have major dilution from the substrate. Due to the action of the fine grain strengthening and the phase constituent, the wear resistance and microhardness of pure Ti surface were greatly improved.

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Microstructure and properties of in-situ synthesized ZrC-Al3Zr reinforced composite coating on AZ91D magnesium alloy by laser cladding

Surface and Coatings Technology ◽

10.1016/j.surfcoat.2017.12.007 ◽

2018 ◽

Vol 334 ◽

pp. 471-478 ◽

Cited By ~ 14

Author(s):

Yu Guo ◽

Yingqiao Zhang ◽

Zhiyong Li ◽

Shouzheng Wei ◽

Tao Zhang ◽

...

Keyword(s):

Magnesium Alloy ◽

Composite Coating ◽

Laser Cladding ◽

Microstructure And Properties ◽

Az91d Magnesium Alloy ◽

Reinforced Composite

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Laser Cladding of Ni-Co-W Composite Coating on Stainless Steel to Enhance Wear Resistance

Materials Science ◽

10.5755/j02.ms.28686 ◽

2021 ◽

Author(s):

Linlin ZHANG ◽

Dawei ZHANG

Keyword(s):

Stainless Steel ◽

Wear Resistance ◽

Composite Coating ◽

Laser Cladding ◽

Composite Coatings ◽

Eutectic Structure ◽

Wear Properties ◽

Fine Grained ◽

Noticeable Improvement ◽

Enhance Wear Resistance

Ni-Co-W composite coatings modified by different contents of Co-based alloy powder in the Ni-based alloy with 35 wt.% WC (Ni35WC) were deposited on stainless steel by laser cladding. The influence of compositional and microstructural modification on the wear properties has been comparatively investigated by XRD, SEM, and EDS techniques. It was found that the austenite dendrites in the modified coating adding 50 wt.% Co-based alloy were refined and a lot of Cr23C6 or M23(C, B)6 compounds with fine lamellar feature were formed around austenitic grain boundaries or in the intergranular regions. The contribution of element Co to the modification of Ni35WC coating is that it cannot only promote the formation of more hard compounds to refine austenite grains, but also refine the size of precipitates, and change the phase type of eutectic structure as a result of disappeared Cr boride brittle phases. A noticeable improvement in wear resistance is obtained in the Ni35WC coating with 50 wt.% Co-based alloy, which makes the wear rate decreased by about 53 % and 30% by comparison to that of the substrate and the Ni35WC coating, respectively. It is suggested that the improvement is closely related to the composite coating being strengthened owing to the increase of coating hardness, formation of a fine-grained microstructure caused by Co, and fine hard precipitate phases in the eutectic structure.

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