Research on Laser Cladding Co-Based Alloy on the Surface of Vermicular Graphite Cast Iron

Sun, Feng; Cai, Keqian; Li, Xiaoxu; Pang, Ming

doi:10.3390/coatings11101241

Cited by 11 publications

(7 citation statements)

References 24 publications

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“…For a deeper understanding of the corrosion performance of the substrate and the cladding layers, equivalent circuit models were employed, as shown in Figure 7, and Nyquist plots were obtained by fitting the data using ZView 3.1 software in both 3.5 wt.% NaCl and 0.5 mol/L H 2 SO 4 solutions. In an equivalent circuit model, CPE represents a constant phase angle difference element instead of an ideal capacitor, Rs represents solution resistance, and Rct represents the charge transfer resistance of the electrode [30]. The test results are presented in Table 5.…”

Section: Electrochemical Corrosion Performance Analysismentioning

confidence: 99%

“…Based on the band theory, the Fe 2p orbitals comprised peaks corresponding to Fe2O3 (708.92 eV), Fe3O4 (713.66 eV), Fe 0 (721.83 eV), and FeO (711.36 eV). Similarly, the Cr 2p orbitals had peaks corresponding to Cr2O3 (575.84 In an equivalent circuit model, CPE represents a constant phase angle difference element instead of an ideal capacitor, R s represents solution resistance, and R ct represents the charge transfer resistance of the electrode [30]. The test results are presented in Table 5.…”

Section: Xps Analysis Of Cladding Layersmentioning

confidence: 99%

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The Microstructure and Properties of Laser-Cladded Ni-Based and Co-Based Alloys on 316L Stainless Steel

Fang,

Huang,

Qian

et al. 2024

Metals

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To extend the service life of 316L stainless steel components in harsh environments, this study utilized laser cladding technology to enhance the hardness, wear resistance, and corrosion resistance of the 316L stainless steel surface. Nickel-based and cobalt-based cladding layers were prepared on the surface of the 316L stainless steel, and the microstructure and phases of the layers were analyzed using scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. In addition, the hardness of the substrate and the cladding layers was tested with a microhardness tester, the frictional wear performance was tested with a pin on disc wear tester, and the corrosion resistance was tested with an electrochemical workstation. The experimental results indicate that the nickel-based cladding layer primarily comprises the γ-(Fe, Ni), Cr7C3, and Ni3Si phases, with equiaxed and dendritic grains being the predominant morphologies. By contrast, the cobalt-based cladding layer mainly comprises the γ-Co, Cr7C3, and Co7W6 phases, with columnar and dendritic grains being the predominant morphologies. Both cladding layers displayed a significantly better microhardness, wear resistance, and corrosion resistance than the substrate. Between the two cladding layers, the nickel-based cladding layer demonstrated a superior microhardness, whereas the cobalt-based cladding layer slightly outperformed in wear resistance and corrosion resistance. The findings from our results are important for understanding the performance of laser-cladding layers and laying a scientific basis for the promotion and optimization of laser cladding technology in industrial applications. Moreover, our results showed that laser cladding technology is increasingly important in extending the service life of components and improving the material performance.

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Section: Electrochemical Corrosion Performance Analysismentioning

confidence: 99%

Section: Xps Analysis Of Cladding Layersmentioning

confidence: 99%

The Microstructure and Properties of Laser-Cladded Ni-Based and Co-Based Alloys on 316L Stainless Steel

Fang,

Huang,

Qian

et al. 2024

Metals

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“…At present, there are many processes used to prepare Ni 3 Al matrix composites, such as hot isostatic pressing [9], surfacing [10], thermal spraying [11], laser cladding [12], etc. Compared with other surface-strengthening technologies, laser cladding is an efficient and clean surface modification technology [13,14]. Chen et al [15] studied the microstructure characteristics and wear resistance of a Ni 3 Al alloy and a Ni 3 Al/Cr 3 C 2 laser cladding layer.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Laser Power on the Microstructure and Wear Resistance of a Ni3Al-Based Alloy Cladding Layer Deposited via Laser Cladding

Cai,

Dong,

Zhao

et al. 2024

Coatings

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A coating prepared via laser cladding has the advantages of a high-density reinforced layer, a low matrix dilution rate, and combination with matrix metallurgy. In this study, Ni3Al-based alloy cladding layers with Cr7C3 were prepared via laser cladding, and the corresponding microstructures and wear resistance were studied in detail. The results show that the Ni3Al-based cladding layer prepared using laser cladding technology had good metallurgical bonding with the matrix, and there were no pores, cracks, or other defects on the surface. The microstructures of the laser cladding layer were mainly γ′-Ni3Al, β′-NiAl, and in situ C7C3. As the laser power increased, the heat input increased, resulting in an increase in the dilution rate. Simultaneously, the carbide size in the laser cladding layer increased. With the increase in laser power, the hardness of the laser cladding layer of the Ni3Al-based alloy decreased, and the wear resistance of the laser cladding layer first strengthened and then weakened. When the laser power increased to 2.0 kW, the wear rate of the laser cladding layer decreased to 0.480 × 10−5 mm3/N·m. When the laser power increased to 2.4 kW, the wear rate of the laser cladding layer increased to 0.961 × 10−5 mm3/N·m, which was twice the rate at 2.0 kW. This could be attributed to small Cr7C3 particles, which could not effectively separate the wear pairs, resulting in more serious adhesive wear. Large Cr7C3 particles caused the surface of cast iron material with lower hardness to be damaged, which suffered more serious particle wear. The generation of short rod-shaped carbides should be avoided because, in the process of friction and wear, carbides with these shapes are easy to break, thus leading to crack initiation.

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“…The unreasonable selection of laser process parameters such as laser power, scanning speed, and powder feeding rate is the main reason for the poor forming characteristics of the cladding layer [9]. Scholars have carried out a lot of research on various methods to optimize the process parameters of laser cladding, including the response surface method (RSM) [10][11][12], grey relational analysis [13,14], optimization algorithm [15], and linear regression method, etc.…”

Section: Introductionmentioning

confidence: 99%

Multi-Objective Process Optimization of Laser Cladding Co-Based Alloy by Process Window and Grey Relational Analysis

Yue

Guo

et al. 2023

Coatings

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To determine the optimal process parameters for the preparation of a Co-based alloy cladding layer, the experimental research of laser cladding Co-based alloy was carried out based on the optimal process window and grey relational analysis methods with 42CrMo as the substrate. The analysis of variance (ANOVA) was used to explore the influence laws of laser process parameters on the forming characteristics of the cladding layer within the optimal process window range. Furthermore, the optimal process parameter combination was obtained by grey relational analysis, and the experimental verification of the optimization results was conducted. It was found that the process parameter interval determined by the optimal process window was laser power 1300–2100 W, scanning speed 6–14 mm/s, and powder feeding rate 17.90–29.84 g/min. The influence order of each process parameter was: laser power > scanning speed > powder feeding rate. The optimal process parameters of laser power 2100 W, scanning speed 6 mm/s, and powder feeding rate 17.90 g/min were obtained. The experimental verification results of optimal process parameters proved that the grey correlation grade of the optimized parameters was improved by 0.260 compared with the initial parameters and agreed well with the prediction value with an accuracy of 96%. After optimization, the cross-sectional area, the ratio of the width to height, cladding efficiency, and powder utilization rate of the cladding track increased by 4.065 mm2, 1.031, 19.032, and 70.3%, respectively, and the fluctuation ratio decreased by 60.9%. The optimal cladding track was well bonded to the substrate without cracks, holes, and evident element segregation, and included the phases of Cr3C7, CoCx, fcc-Co, and WC.

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Research on Laser Cladding Co-Based Alloy on the Surface of Vermicular Graphite Cast Iron

Cited by 11 publications

References 24 publications

The Microstructure and Properties of Laser-Cladded Ni-Based and Co-Based Alloys on 316L Stainless Steel

The Microstructure and Properties of Laser-Cladded Ni-Based and Co-Based Alloys on 316L Stainless Steel

The Effect of Laser Power on the Microstructure and Wear Resistance of a Ni3Al-Based Alloy Cladding Layer Deposited via Laser Cladding

Multi-Objective Process Optimization of Laser Cladding Co-Based Alloy by Process Window and Grey Relational Analysis

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