Investigation of the Microstructure and Properties of NiCrBSi Coating Obtained by Laser Cladding with Different Process Parameters

Hu, Guofang; Yang, Yong; Qi, Kang; Lu, Xin; Li, Jindong

doi:10.1007/s12666-020-02065-w

Cited by 14 publications

(6 citation statements)

References 22 publications

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“…The 2.4 kW laser power provided greater energy density, which increased the heat input into the cladding layer, increased the temperature of the molten pool, and prolonged the duration of the molten pool. Under other conditions, it was observed that the higher the laser power, the greater the energy injected into the cladding layer, the slower the solidification rate, and the larger and sparser the microstructure particles [ 31 ].…”

Section: Resultsmentioning

confidence: 99%

Study of the Microstructure and Corrosion Properties of a Ni-Based Alloy Coating Deposited onto the Surface of Ductile Cast Iron Using High-Speed Laser Cladding

Wang

Ouyang

et al. 2022

Materials

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To improve the surface corrosion resistance of ductile iron, Ni-based alloy coatings were prepared using a high-speed laser cladding technology with different levels of laser power. The microstructure, phases, and corrosion properties of the coatings were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), and an electrochemical workstation. Variations in laser power did not change the main phases of the coatings, which were composed of γ-Ni, Ni3B, Ni2Si, and Cr23C6. With an increase in power, the degree of segregation in the coating decreased, sufficient melting between elements was achieved, and the chemical composition became more uniform. Enhancement of the laser power resulted in more energy being injected into the cladding, which allowed adequate growth of tissue, and dendrites continued to grow in size as the power increased. The self-corrosion potentials of the coatings at laser power levels of 1.6, 2.0, and 2.4 kW were −625.7, −526.5, and −335.7 mV, respectively. The corrosion potential of the 2.4 kW coating was the highest, and the corroded surface of the cladding layer included mainly sizeable continuous structures with a light degree of corrosion and the highest corrosion resistance.

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Section: Resultsmentioning

confidence: 99%

Study of the Microstructure and Corrosion Properties of a Ni-Based Alloy Coating Deposited onto the Surface of Ductile Cast Iron Using High-Speed Laser Cladding

Wang

Ouyang

et al. 2022

Materials

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“…This may be attributed to the lack of a Ni-Cu interlayer in LGC and the higher energy input of the laser beam operating directly on the copper substrate increasing the substrate’s diluting effect on the coating and causing a large number of Cu elements to enter the coating, thus influencing the overall microhardness of LGC. On the other hand, the coating’s density lowering due to the existence of defects such as cracks and pores inside LGC as seen in Figure 6 b also impact its microhardness [ 8 , 44 ]. It is worth noting that the value of the average microhardness of the fourth layer of CLGC is 478.8 HV 0.5 , being almost eight times that of the Cu substrate.…”

Section: Resultsmentioning

confidence: 99%

“…However, the strength and wear resistance requirements of certain fields cannot be met by traditional copper alloys [ 3 , 4 , 5 ]. As an advanced surface modification technology, laser cladding (LC) forms high-performance coating with metallurgical bonding on Cu substrates by using a high-energy laser beam and thus improving the surface strength and wear resistance of the Cu substrate greatly [ 6 , 7 , 8 , 9 ]. Nevertheless, it is difficult to laser clad the surfaces of copper alloys with a crack-free, metallurgically bonded, wear-resistant cladding layer due to their low wettability with a variety of materials and the high reflectivity of the laser [ 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Properties of Nickel-Based Gradient Coatings Prepared Using Cold Spraying Combined with Laser Cladding Methods

et al. 2023

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A cold spray–laser cladding composite gradient coating (CLGC) was successfully formed on a Cu substrate. In comparison with traditional laser cladding gradient coatings (LGC), cold spraying the pre-set Ni-Cu alloy’s intermediate transition layer not only mitigates the negative impacts due to the high reflectivity of the copper substrate but also helps to minimize the difference in the coefficients of thermal expansion (CTE) between the substrate and coating. This reduces the overall crack sensitivity and improves the cladding quality of the coating. Besides this, the uniform distribution of hard phases in CLGC, such as Ni11Si12 and Mo5Si3, greatly increases its microhardness compared to the Cu substrate, thus resulting in the value of 478.8 HV0.5 being approximately 8 times that of the Cu substrate. The friction coefficient of CLGC is lowered compared to both the Cu substrate and LGC with respective values of 0.28, 0.54, and 0.43, and its wear rate is only one-third of the Cu substrate’s. These results suggest CLGC has excellent anti-wear properties. In addition, the wear mechanism was determined from the microscopic morphology and element distribution and was found to be oxidative and abrasive. This approach combines cold spraying and laser cladding to form a nickel-based gradient coating on a Cu substrate without cracks, holes, or other faults, thus improving the wear resistance of the Cu substrate and improving its usability.

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“…When the laser energy density (E) is low, the molten coating powder may not melt sufficiently, leading to an increased rate of coating cracking. Increasing the laser energy density (E) ensures sufficient melting of the metal in the molten pool, reducing the susceptibility of the coating to cracking [106,107];…”

Section: Main Process Parametersmentioning

confidence: 99%

Crack Formation Mechanisms and Control Methods of Laser Cladding Coatings: A Review

Li¹,

Huang²,

Yi³

2023

Coatings

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Laser cladding, a novel surface treatment technology, utilizes a high-energy laser beam to melt diverse alloy compositions and form a specialized alloy-cladding layer on the surface of the substrate to enhance its property. However, it can generate substantial residual stresses during the rapid cooling and heating stages, due to inadequate selection of cladding process parameters and disparities in thermophysical properties between the clad layer and substrate material, leading to the formation of various types of cracks. These cracks can significantly impact the quality and performance of the coating. This paper presents a comprehensive review of crack types and their causes in laser cladding coatings, and identifies that three primary sources of residual stresses, thermal stress, organizational stress, and restraint stress, are the fundamental causes of crack formation. The study proposes several strategies to control coating cracks, including optimizing the coating layer material, refining the coating process parameters, incorporating heat treatment, applying auxiliary fields, and utilizing numerical simulations to predict crack initiation and propagation. Additionally, the paper summarizes crack control methods for emerging structural materials and novel preparation processes. Lastly, the paper analyzes the prospects, technical approaches, and key research directions for effectively controlling cracks in laser cladding coatings.

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Investigation of the Microstructure and Properties of NiCrBSi Coating Obtained by Laser Cladding with Different Process Parameters

Cited by 14 publications

References 22 publications

Study of the Microstructure and Corrosion Properties of a Ni-Based Alloy Coating Deposited onto the Surface of Ductile Cast Iron Using High-Speed Laser Cladding

Study of the Microstructure and Corrosion Properties of a Ni-Based Alloy Coating Deposited onto the Surface of Ductile Cast Iron Using High-Speed Laser Cladding

Microstructure and Properties of Nickel-Based Gradient Coatings Prepared Using Cold Spraying Combined with Laser Cladding Methods

Crack Formation Mechanisms and Control Methods of Laser Cladding Coatings: A Review

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