Experimental research on the influence of ultrasonic vibrations on the laser cladding process of a disc laser

Han, Xing; Li, Chang; Yang, Youwen; Gao, Xing; Hang, Gao

doi:10.1016/j.surfcoat.2020.126750

Cited by 35 publications

(9 citation statements)

References 16 publications

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“…Other novel methods have been proposed for grain orientation control, and they have also shown promising potential to assist the AM processes for epitaxial growth of SX structure, such as using laser inclination and defocusing, [40,84,107] applying external magnetic field, [108][109][110] adopting hybrid laser manufacturing processes, [111] and applying ultrasound. [112][113][114] Since competitive grain growth condition can be significantly affected under different melt pool morphology, [55,87,115] researchers have been exploring other methods for modulating melt pool morphology in addition to optimizing process parameters and improving substrate properties. One of the effective methods is adjusting the beam defocus distance.…”

Section: Auxiliary Methods Facilitating Epitaxial Grain Growthmentioning

confidence: 99%

Section: Epitaxial Growth For Single Crystals By Am Processesmentioning

confidence: 99%

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Epitaxial Growth and Stray Grain Control toward Single‐Crystal Metallic Materials by Additive Manufacturing: A Review

Liu

Shi

2023

Adv Eng Mater

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Additive manufacturing (AM) possesses tremendous potential in controlling epitaxial growth of deposited materials, and thus attempts have been made to employ AM technology to fabricate or repair single‐crystal (SX) metal parts in recent years. One of the key issues in producing SX structures is the elimination of stray grain (SG) formation, but the layer‐wise fabrication nature of AM processes makes SGs difficult to avoid. Herein, the state‐of‐the‐art developments in this emerging research area are surveyed. It introduces the fundamental mechanisms of epitaxial growth in AM, summarizes the recent innovations and findings on using AM techniques to assist epitaxial growth and avoid SGs for SX metallic materials, discusses the relation of stray‐grain avoidance and crack‐free microstructure, and reviews the analytical and numerical modeling efforts for epitaxial growth and texture control. In addition, the challenges in achieving defect‐free SX microstructure are discussed, such that future research directions are pointed out. It is believed that this critical review provides insights on microstructure control for AM‐produced metallic materials and lays a solid foundation to stimulate more rigorous research.

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Section: Auxiliary Methods Facilitating Epitaxial Grain Growthmentioning

confidence: 99%

Section: Epitaxial Growth For Single Crystals By Am Processesmentioning

confidence: 99%

Epitaxial Growth and Stray Grain Control toward Single‐Crystal Metallic Materials by Additive Manufacturing: A Review

Liu

Shi

2023

Adv Eng Mater

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“…Figure 9 shows the main effect mechanism of ultrasonic vibration changing the microstructure of laser cladding coating, including the initial cavitation bubble, cavitation bubble oscillation, cavitation bubble collapse, and dendrite fracture. The ultrasonic cavitation effect caused the cavitation bubble in the molten pool to collapse [26], the highspeed micro-shock wave was generated at the moment of bubble collapse [27], high-speed microjets caused by micro-shock wave broke the growing TiB dendrites, and then many TiB granular crystal grains formed. Figure 9 shows the main effect mechanism of ultrasonic vibration changing the microstructure of laser cladding coating, including the initial cavitation bubble, cavitation bubble oscillation, cavitation bubble collapse, and dendrite fracture.…”

Section: Effect Of Ultrasonic Vibration On Microstructure Of the Coatingsmentioning

confidence: 99%

Microstructure and Mechanical Properties of TiC/TiB Composite Ceramic Coatings In-Situ Synthesized by Ultrasonic Vibration-Assisted Laser Cladding

Chen

Deng

et al. 2022

Coatings

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Laser cladding coating has many advantages in surface modification, such as a small heat-affected zone, and good metallurgical bonding. However, some serious problems such as pores, and poor forming quality still exist in the coating. To suppress these problems, a novel process of ultrasonic vibration-assisted laser cladding process was adopted to in-situ synthesize TiC/TiB composite ceramic coating on the surface of titanium alloy. Results showed that the introduction of ultrasonic vibration effectively improved the surface topography of the coating, reduced the number of pores in the coating, refined the crystal grains of the coating, decreased the residual tensile stress in the coating, and increased the micro-hardness of the coating. The tribological properties of the coating were significantly improved by the ultrasonic vibration, the wear resistance of the coating fabricated with ultrasonic vibration at power of 400 W increased about 1.2 times compared with the coating fabricated without ultrasonic vibration, and the friction coefficient decreased by 50%.

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“…Ultrasonic vibration, as a type of auxiliary field, has been applied in the solidification process of molten metal to refine the growth of microstructures via the synergistic effect of ultrasonic cavitation and acoustic streaming [19,20]. Based on mathematical deduction and analysis, Zhu et al [21] proposed that the degree of undercooling and nucleation rate of the molten pool increase with increasing amplitude and frequency of the ultrasonic vibration.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic-Induced Grain Refinement in Laser Cladding Nickel-Based Superalloy Reinforced by WC Particles

et al. 2023

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Laser cladding was used to prepare three composite coatings, i.e., Inconel 718 nickel-based superalloy (IN718), IN718-50 wt.% WC created by adding tungsten carbide (WC) particles and IN718-50 wt.% WC assisted by ultrasonic vibration. The phase composition, microstructure evolution, microhardness, residual stress and tribological properties of the three coatings were studied. The addition of WC enhances hardness and improves tribological properties, but also causes aggregation and considerable formation of carbides associated with rough structure. Ultrasonic vibration greatly refines the solidification microstructure, as it can break the growing dendrites, reduce the aggregation of reinforced particles and refine solidified structure. The average microhardness of the latter two composite coatings was increased by 36.37% and 57.15%, respectively, compared with the first IN718 coating, and the last composite coating (ultrasonic assistance) had the lowest COF (0.494). The WC particles and refined carbides converted the wear mechanism from adhesive wear to abrasive wear. In addition, the resultant stress on the surface of the composite coating roughly doubled after adding 50 wt.% WC, and only increased by 49.53% with ultrasonic treatment. The simulation results indicate that acoustic cavitation mainly occurs in the middle and bottom of the molten pool and proper frequency ultrasonic is conducive to the generation of the cavitation effect.

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Experimental research on the influence of ultrasonic vibrations on the laser cladding process of a disc laser

Cited by 35 publications

References 16 publications

Epitaxial Growth and Stray Grain Control toward Single‐Crystal Metallic Materials by Additive Manufacturing: A Review

Epitaxial Growth and Stray Grain Control toward Single‐Crystal Metallic Materials by Additive Manufacturing: A Review

Microstructure and Mechanical Properties of TiC/TiB Composite Ceramic Coatings In-Situ Synthesized by Ultrasonic Vibration-Assisted Laser Cladding

Ultrasonic-Induced Grain Refinement in Laser Cladding Nickel-Based Superalloy Reinforced by WC Particles

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