Effect of carbon nanotubes content on microstructure and properties of WC/Ni laser cladding coatings

Liu, Jinduo; Huang, Yong

doi:10.1080/02670844.2020.1812481

Cited by 18 publications

(7 citation statements)

References 28 publications

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“…Moreover, this work indicates the presence of carbide formation in the microstructure of SS 304L-CNT composite, which may be responsible for grain refinement. Similar observations were done by Liu et al 14 in the microstructure of Ni-WC laser cladding coatings with CNTs content ranging from 0 to 5 wt%.…”

Section: Introductionsupporting

confidence: 87%

Effects of CNTs addition on the microstructure and microhardness of stainless steel alloy/carbon-manganese non-alloyed steel welding

Reis

Sousa

Ferreira

et al. 2021

Journal of Composite Materials

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In recent years some progress has been made about the addition of Carbon Nanotubes (CNTs) in the stainless steel metal matrix by pulsed Gas Tungsten Arc Welding (P-GTAW). Despite that, there is lack of information regarding to microstructural modifications induced by CNTs in dissimilar welding. In this sense, we present the welding of nanocomposite based on Nickel/Carbon Nanotubes-stainless steel 316L alloy (Ni/CNTs-SS 316L), as the welding metal, on carbon-manganese (C-Mn) non-alloyed structural steel, as the base metal. The microstructure of manufactured specimens with/without nanocomposite was characterized by: optical microscopy; Raman spectroscopy; scanning electron microscopy with energy dispersive spectroscopy (SEM-EDS) and electron backscattering diffraction (EBSD). Moreover, Vickers tests were performed from the welding metal (WM) to the base metal (BM) before/after temper treatment in order to investigate the microhardness changes. The results show that dilution rate and grain size for specimen with nanocomposite was higher than without nanocomposite; the CNTs affected the misorientation angle and texture of the WM; the topside microhardness from WM with Ni-CNTs was on average 30.40% higher than BM; and, in transverse cross-section microhardness was 31% higher than control sample on average at fusion line zone. These results indicate that addition of CNTs in the metallic matrix by dissimilar welding is a fertile ground for new studies applicable to manufacturing industry.

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Section: Introductionsupporting

confidence: 87%

Effects of CNTs addition on the microstructure and microhardness of stainless steel alloy/carbon-manganese non-alloyed steel welding

Reis

Sousa

Ferreira

et al. 2021

Journal of Composite Materials

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“…The wave shape appears at the interface between the coating and the substrate, which is caused by the gradual decrease of the laser energy density distribution from the center to the periphery. Therefore, the bottom boundary of the heat affected zone also presents a shallow wave shape [21]. After five measurements for each sample, the average thickness of the coating and HAZ is obtained, and the thickness results are shown in Figure 5.…”

Section: Microstructurementioning

confidence: 99%

Effect of High-Speed Powder Feeding on Microstructure and Tribological Properties of Fe-Based Coatings by Laser Cladding

Wang

Qian

et al. 2021

Coatings

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In order to improve the wear resistance of 27SiMn steel substrate, Fe-based alloy coatings were prepared by laser cladding technology in the present study. In comparison to the conventional gravity powder feeding (GF) process, high-speed powder feeding (HF) process was used to prepare Fe-based alloy coating on 27SiMn steel substrate. The effect of diversified energy composition of powder materials on the microstructure and properties of coatings were systematically studied. X-ray diffractometer (XRD), optical microscope (OM) and scanning electron microscope (SEM) were used to analyze the phase structure and microstructure of Fe-based alloy coatings, and the hardness and tribological properties were measured by the microhardness tester and ball on disc wear tester, respectively. The results show that the microstructure of conventional gravity feeding (GF) coatings was composed of coarse columnar crystals. In comparison, owing to the diversification of energy composition, the microstructure of the high-speed powder feeding (HF) coatings consists of uniform and small grains. The total energy of the HF process was 75.5% of that of the GF process, proving that high-efficiency cladding can be achieved at lower laser energy. The refinement of the microstructure is beneficial to improve the hardness and wear resistance of the coating, and the hardness of the HF coating increased by 9.4% and the wear loss decreased to 80.5%, compared with the GF coating. The wear surface of the HF coating suffered less damage, and the wear mechanism was slightly adhesive wear. In contrast, wear was more serious in the GF coating, and the wear mechanism was transformed into severe adhesive wear.

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“…The dissimilar MMC coating is quite challenging because MMC coating has fundamental qualities such as rapid heating and rapid cooling, which generates high thermal stresses. This, in turn, gives rise to the development of cracks, voids and pores near the interfacial zone, which is undesirable [15]. These defects lead to the minimization of coating strength, which ultimately fails the material and makes it non-functional.…”

Section: Introductionmentioning

confidence: 99%

Composite coating by TIG cladding with different rare earth oxides

Kumar

Jha

et al. 2022

Surface Engineering

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In this study, composite coating with different rare earth oxides has been performed to enhance the surface, mechanical and tribological properties of titanium alloy using the TIG cladding process. Three different rare earth oxides, CeO 2 , La 2 O 3 and Y 2 O 3 were used in pairwise combination with WC and Ni powder. The cladding thickness, microstructure, phase analysis, microhardness and friction wear of coated samples were examined. The experimental results showed that mainly hard phases like NiTi and AlTi 2 C were found in coatings. The sample prepared with RE oxides refines the coating grains and enhances the mechanical and tribological properties. The wear test analysis reveals a considerable decrease in coefficient of friction (COF). The mechanism for the wear of coating was adhesion. The coating done with CeO 2 and La 2 O 3 has the highest microhardness (870 HV 0.5 ) and wear resistance (COF of 0.22), which confirmed that this combination of RE oxide is appropriate for surface modification.

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Effect of carbon nanotubes content on microstructure and properties of WC/Ni laser cladding coatings

Cited by 18 publications

References 28 publications

Effects of CNTs addition on the microstructure and microhardness of stainless steel alloy/carbon-manganese non-alloyed steel welding

Effects of CNTs addition on the microstructure and microhardness of stainless steel alloy/carbon-manganese non-alloyed steel welding

Effect of High-Speed Powder Feeding on Microstructure and Tribological Properties of Fe-Based Coatings by Laser Cladding

Composite coating by TIG cladding with different rare earth oxides

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