Development mechanism and solidification morphology of molten pool generated by laser cladding

Song, Baoyan; Yu, Tianbiao; Jiang, Xingyu; Xi, Wenchao; Lin, Xiaojun

doi:10.1016/j.ijthermalsci.2020.106579

Cited by 56 publications

(9 citation statements)

References 27 publications

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“…The first type corresponds interface between the molten pool and the partially melted substrate. The secon pertains to suspended impurities with high melting points, where non-uniform nuclei adhere to nucleate, consequently enhancing the nucleation rate of grain achieving the desired strengthening effect by refining the microstructure [23]. The melting and solidification of the laser cladding pool constitute a dynamic process involving two types of solid-liquid boundary surfaces.…”

Section: Dilution Rate η = H H + Hmentioning

confidence: 99%

Research on the Process of Laser Cladding Ni60 Coating on High-Nickel Cast Iron Surfaces

Chen,

Feng,

Chen

et al. 2024

Processes

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In order to achieve high-performance coatings on the surface of electric submersible pump impellers, it is crucial to optimize the laser cladding process parameters. Using Ansys 2021 R1 commercial software, a numerical simulation of laser cladding Ni60 powder on high nickel cast iron was conducted. The simulation utilized a 3D Gaussian heat source, parametric language, and life–death unit technology to replicate the characteristics of synchronous powder delivery laser cladding. The study focused on analyzing the temperature field cloud map and molten pool size under different laser power and scanning speeds, narrowing down the process parameter window, selecting optimized laser power and scanning speed, and assessing the changes in surface morphology, melting height and width, dilution rate, microhardness, and microstructure of the laser cladding coating. Results indicate that the coating width and thickness increase with higher laser power and lower scanning speeds. The microstructure consists primarily of dendritic, block, short rod, and long strip formations, and exhibits a tightly distributed and uniform grain structure. Furthermore, the microhardness of the coating shows a negative correlation with laser power and scanning speed. The optimal process parameters were determined to be a laser power of 1100 W and a scanning speed of 6 mm/s. A comparison with the simulation confirmed the effectiveness of the simulation in effectively guiding actual production.

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Section: Dilution Rate η = H H + Hmentioning

confidence: 99%

Research on the Process of Laser Cladding Ni60 Coating on High-Nickel Cast Iron Surfaces

Chen,

Feng,

Chen

et al. 2024

Processes

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show abstract

“…By applying a laser cladding layer to the hydraulic cylinder, the substrate undergoes localized heat treatment at different temperatures and depths, resulting in significant changes in its mechanical properties [3][4] . The best scanning speed ensures that there are no cracks and pores in the cladding layer, and it has a good metallurgical bond [5][6] . In conclusion, taking into consideration the cylinder's service environment, for the laser cladding strengthening technology of the hydraulic cylinder surface, the coating preparation process is very important [7] .…”

Section: Introductionmentioning

confidence: 99%

Microstructure and properties of 316L cladding layer on Hydraulic support cylinder

Xu,

Zhang,

Liu

et al. 2024

J. Phys.: Conf. Ser.

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Scanning speed refers to the motion of the laser beam on the surface of the substrate. The transformation of heat affected zone and microstructure of the matrix were observed by increasing the motion speed and martensite content. The effect of scanning speed on the microstructure and properties of the coating was studied. In addition, the electrochemical properties and hardness of the workpiece are also improved.

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“…assumed the cladding powder and the substrate to be the same material when establishing the numerical simulation model [4] ; Song B.X. and Heng G. considered the temperature change characteristics of the clad material, the Marangoni effect of the melt pool surface tension and the effect of buoyancy on the molten metal flow for the numerical simulation of the laser cladding process [5] [6] . Chai Q. calculated the profile of the molten cladding layer using a cellular automata approach [7] .…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation and experimental study of melt pool morphology for laser cladding of inclined substrates

Huang

Luo

Zhou

et al. 2023

Second International Conference on Advanced Manufacturing Technology and Manufacturing Systems (ICAMTMS 2023)

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In order to investigate the effect of substrate on the shape of the laser cladding pool, this paper established the numerical simulation model of laser cladding on inclined substrates based on multiphase flow theory. VOF method was adopted to capture the gas-liquid interface. The effect of substrate incline on energy distribution and powder concentration is considered, and the mass and energy input are simulated by adding a source term to the melt pool surface. Finally, comparative experiments are designed to validate the model. The results show that the molten pool showed an obvious inward flow pattern. As the incline angle increases, the laser energy density and powder concentration distribution decreases, and the height and width of the cladding layer decreases. The average deviation between the experimental and simulated values was controlled at 5.8% and 3.7%, respectively, and the model had good explanatory power.

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Development mechanism and solidification morphology of molten pool generated by laser cladding

Cited by 56 publications

References 27 publications

Research on the Process of Laser Cladding Ni60 Coating on High-Nickel Cast Iron Surfaces

Research on the Process of Laser Cladding Ni60 Coating on High-Nickel Cast Iron Surfaces

Microstructure and properties of 316L cladding layer on Hydraulic support cylinder

Numerical simulation and experimental study of melt pool morphology for laser cladding of inclined substrates

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