Experimental and numerical simulation studies of the flow characteristics and temperature field of Fe-based powders in extreme high-speed laser cladding

Zhang, Wei; Liu, Yan; Hu, Dengwen; Lv, Hang; Yang, Qiling

doi:10.1016/j.optlastec.2023.110317

Cited by 6 publications

(2 citation statements)

References 19 publications

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“…Most of the laser energy is absorbed by the powders before they reach the substrate; only a small melting pool is formed on the substrate surface by residual laser energy. As a result, powder particles are melted by the laser beam before hitting the substrate, entering the melting pool in a molten or semi-molten state [4,5]. Consequently, the EHLD has the advantages of high depositing speed, rapid cooling rate, and minimal dilution rate, providing high economic benefits and satisfactory material performance [2,6].…”

Section: Introductionmentioning

confidence: 99%

“…A fine equiaxial dendritic structure could be obtained under a high laser cladding rate. Zhang et al [4] established a powder flow model by using a transient bidirectional coupling calculation method to investigate the effects of laser power, carriergas flow rate, and shielding-gas flow rate on particle temperature profiles during the EHLD process. According to their results, the carrier-gas and protective-gas flow rates are key factors for determining the maximum elevation angle of the powder flow.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and Microhardness of High-Strength Aluminium Alloy Prepared Using High-Speed Laser Fabrication

Wu,

Chen,

et al. 2024

Metals

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As a recently developed high-strength aluminium alloy used specifically for laser additive manufacturing, AlMgMnSc alloy possesses superior mechanical properties and excellent processability. Extreme high-speed laser deposition (EHLD) is a novel surface-modification technique, which is characterised by high depositing speed, rapid cooling, rate and minimal dilution rate. To offer a new method for surface repairing high-strength aluminium alloys, an AlMgMnSc alloy coating, containing two deposition layers, is prepared on a 6061 aluminium-alloy axle using the EHLD technique. Meanwhile, the microstructure, composition distribution, and microhardness variation of the fabricated coating are studied. The results reveal that the coating is dense and crack-free, which is well-bonded with the substrate. Additionally, layer 1 is mainly composed of large columnar and equiaxed grains, while layer 2 consists of a fully equiaxed grain structure with an average grain size of about 4.5 μm. Moreover, the microhardness of the coating (about 104~118 HV) is similar to the substrate (about 105 HV), proving the feasibility of repairing high-strength aluminium alloys using AlMgMnSc alloy powders through the EHLD technique.

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