Erosion behaviour of laser cladded Inconel 625 — Vanadium carbide metal matrix composites coatings manufactured with different reinforcement contents

Verdi, Davide; Cortés, Rocío; Chia, Guo Yong; Tay, Grace

doi:10.1016/j.surfcoat.2023.130282

Cited by 1 publication

(1 citation statement)

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“…Currently, the materials used in laser cladding are mainly metal powders, and the feeding methods include pre-positioned powder spreading [ 15 , 16 ] and coaxial powder feeding [ 17 , 18 ]. The powder feeding, laser cladding laser energy absorption rate is high, easy for automating the control, but the powder utilization rate is not high, and the quality of the powder requirements are high.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Wear Resistance of Si-TC4 Composite Coatings by High-Speed Wire-Powder Laser Cladding

Men,

Sun,

et al. 2024

Materials

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The hardness and wear resistance of the surface of TC4 titanium alloy, which is widely used in aerospace and other fields, need to be improved urgently. Considering the economy, environmental friendliness, and high efficiency, Si-reinforced Ti-based composite coatings were deposited on the TC4 surface by the high-speed wire-powder laser cladding method, which combines the paraxial feeding of TC4 wires with the coaxial feeding of Si powders. The microstructures and wear resistance of the coatings were analyzed using X-ray diffraction (XRD), scanning electron microscopy (SEM), Vickers hardness tester, and friction and wear tester. The results indicate that the primary composition of the coating consisted of α-Ti and Ti5Si3. The microstructure of the coating underwent a notable transformation process from dendritic to petal, bar, and block shapes as the powder feeding speed increased. The hardness of the composite coatings increased with the increasing Si powder feeding rate, and the average hardness of the composite coating was 909HV0.2 when the feeding rate reached 13.53 g/min. The enhancement of the microhardness of the coatings can be attributed primarily to the reinforcing effect of the second phase generated by Ti5Si3 in various forms within the coatings. As the powder feeding speed increased, the wear resistance initially improved before deteriorating. The optimal wear resistance of the coating was achieved at a powder feeding rate of 6.88 g/min (wear loss of 2.55 mg and friction coefficient of 0.12). The main wear mechanism for coatings was abrasive wear.

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