Microstructural evolution and bonding characteristic in multi-layer laser cladding of NiCoCr alloy on compacted graphite cast iron

Liu, Hao; Hao, Jingbin; Han, Zhengtong; Yu, Gang; He, Xiuli; Yang, Haifeng

doi:10.1016/j.jmatprotec.2016.02.001

Cited by 74 publications

(24 citation statements)

References 16 publications

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“…In the HAZ, the microhardness of the martensite reaches up to 780 HV. This unstable phase is of a high hardness, which can lead to a cracking behavior as proved by some authors [5]. In order to provide a crack-free coating, it is advisable to limit the HAZ by decreasing the laser input power (under 2300 W for example to maintain the presence of ferrite grains and limit the molten bath) or increasing the scanning speed.…”

Section: Gci Glass Moldmentioning

confidence: 97%

“…But from a power of 2300 W, the ferritic grains cannot be observed. Two kinds of martensite can be seen: the martensite formed after diffusion of carbon on the austenite and a very high cooling rate [5] (which is the case at a power under 1900 W) and a martensite formed after fusion of the substrate and a very high cooling rate (power of 2300 W). Far from the interface, the martensite is not observed.…”

Section: Gci Glass Moldmentioning

confidence: 99%

“…Some researchers have seen that the hardness in the HAZ reduces with a multilayer coating. In fact the martensitic structure transforms into tempered sorbite under the thermal influence after multilayer laser cladding [5]. This helped them to reduce the cracking behavior.…”

Section: Introductionmentioning

confidence: 99%

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Optimization of Microstructural Evolution during Laser Cladding of Ni Based Powder on GCI Glass Molds

Bourahima¹,

Helbert

et al. 2019

KEM

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In glass industry, laser cladding is an innovative surfacing technique allowing to deposit a layer of nickel to protect glass mold against corrosion, abrasion and thermal fatigue. This method (powder fusion by projection), well known in additive manufacturing represents a real technological leap for the glass industry. But during laser cladding of Ni-based powder on gray cast iron, cracks can be observed for some process conditions. These cracks are often due to the Heat Affected Zone that creates structural stresses linked to the development of a martensitic structure in the ferritic matrix of the lamellar graphite cast iron. The aim of this work is to observe the impact of laser cladding (without substrate pre-heating usually employed to limit cracking) on the coating behavior but also on the flake-graphite cast iron substrates. The microstructure and the mechanical properties were studied (SEM and microanalysis, microhardness) around the interface cladding/substrate. Also, the impact of the processing parameters (power P (1500-2300 W), scanning speed v (2.5-10 mm/s) and powder feeding rate PFR (24.5-32.5 g/min) was studied by using the ANOVA (ANalysis Of VAriance) technique. It has been observed that laser cladding on graphite cast iron is possible without cracks by limiting the linear energy induced by the process. Also, an optimization of the processing parameters (P, v, PFR) in order to obtain the industrial expected geometry of the coating has been proposed.

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Section: Gci Glass Moldmentioning

confidence: 97%

Section: Gci Glass Moldmentioning

confidence: 99%

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Optimization of Microstructural Evolution during Laser Cladding of Ni Based Powder on GCI Glass Molds

Bourahima¹,

Helbert

et al. 2019

KEM

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“…Because the growth of the crystal morphology during solidification mainly depends on the value of G/R [9], where 'G' means the temperature gradient of the liquid phase and 'R' is the solidification rate of solid phase, the instantaneous value of G/R changes with the distance to the solidification interface. The cladding layer is divided into three parts: bottom, middle and top, each having a different micro-morphology [24,25]. Figure 10b shows the bottom of the layer, and the input of laser energy.…”

Section: Microstructure Of Coatingmentioning

confidence: 99%

Properties of Curved Parts Laser Cladding Based on Controlling Spot Size

Huang

2020

Applied Sciences

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In this study, a method based on controlling the laser spot size was proposed in the process of curved parts laser cladding, and the coatings obtained by this method were analysed through investigation of the microstructure, microhardness, adhesion property and wear resistance properties. The nonuniform rational B-spline surface (NURBS) reconstruction method was used to obtain the workpiece geometrical characteristics of laser cladding, and through the establishment of a mathematical model, the process of the laser beam working on the curved surface was simplified as the intersection of the cylinder and curvature sphere. Then, the spot size was transformed into the area of a cylinder intersecting with a sphere, and by adjusting the laser head, the size of the laser spot was controlled in the threshold and interpolation points were obtained. The laser cladding trajectory was ensured by these interpolation points, and the experiment was carried out to study the properties of the coating. The results showed that the average coating thickness was about 1.07 mm, and the fluctuation of coating thickness did not exceed 0.05 mm; also, there were no cracks or pores in the layer after penetrant flaw detection. The SEM showed that the grains passed through the transition of plane crystal, cellular crystal, dendrite and equiaxed crystal from the bottom to the top of the layer. After 30 cycles of thermal shock tests, the cladding layer was still well bonded with the substrate and the microhardness and wear resistance were 2 times and 1.4 times higher than that of substrate, respectively.

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“…Figure 50 illustrates methods used in laser cladding. Figure 50: Laser cladding process using (a) by gravity [117], (b) injected powder [118], (c) preplaced powder [119] Scan direction Laser beam…”

Section: Laser Cladding Laser Cladding Laser Cladding Laser Cladding mentioning

confidence: 99%

Biomedical materials and techniques to improve the tribological, mechanical and biomedical properties of orthopedic implants – A review article

Ibrahim

Sarhan

Yusuf

et al. 2017

Journal of Alloys and Compounds

266

100

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Microstructural evolution and bonding characteristic in multi-layer laser cladding of NiCoCr alloy on compacted graphite cast iron

Cited by 74 publications

References 16 publications

Optimization of Microstructural Evolution during Laser Cladding of Ni Based Powder on GCI Glass Molds

Optimization of Microstructural Evolution during Laser Cladding of Ni Based Powder on GCI Glass Molds

Properties of Curved Parts Laser Cladding Based on Controlling Spot Size

Biomedical materials and techniques to improve the tribological, mechanical and biomedical properties of orthopedic implants – A review article

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