Research on the Wear Resistance of Laser-Clad JG-2/cBN Composite Coatings on GH4169 Nickel-Based Alloy

Xina Wang

doi:10.62051/ijmee.v8n3.10

Authors

Xina Wang

DOI:

https://doi.org/10.62051/ijmee.v8n3.10

Keywords:

Laser Cladding, Cubic Boron Nitride (cBN), Wear Resistance, Friction Behavior

Abstract

To enhance the surface wear resistance of GH4169 nickel-based superalloy components under extreme service conditions, this study investigates a laser-clad JG-2/cBN composite coating. The composite coating was fabricated on the GH4169 substrate using a high-power fiber laser with optimized processing parameters (laser power: 1.5 kW, scanning speed: 5 mm/s, powder feed rate: 15 g/min). The JG-2 nickel-based alloy powder was mechanically mixed with cubic boron nitride (cBN) particles at a 1:1 volume ratio as the cladding material, with a pure JG-2 coating prepared under identical conditions as the control group. The microstructure, phase composition, microhardness, and tribological properties of the coatings were systematically characterized. Friction and wear tests were conducted using a ball-on-disc configuration under a 50 N load at room temperature for 60 minutes. Three-dimensional laser confocal microscopy, wear volume measurement, and two-dimensional profilometry were employed to evaluate wear track morphology and wear mechanisms. Results demonstrate that the JG-2/cBN composite coating exhibits superior tribological performance compared to the monolithic JG-2 coating. The friction coefficient of the composite coating remained stable between 0.25 and 0.30 throughout the test, significantly lower than that of the JG-2 coating (approaching 0.9 with severe fluctuations). The maximum wear depth decreased from approximately 97 μm (JG-2 coating) to 20 μm (composite coating), while the wear volume was reduced by approximately 80.1% (from 188,881,542 μm³ to 37,626,995 μm³). Two-dimensional wear scar profiles revealed shallower and narrower grooves with smoother contours for the composite coating, indicating suppressed plastic deformation and material detachment. The incorporation of cBN hard particles enhances the load-bearing capacity, micro-cutting resistance, and interfacial stability of the coating, effectively mitigating adhesive wear, plowing, and oxidative wear mechanisms. This study provides a theoretical foundation and experimental reference for surface strengthening and remanufacturing of critical nickel-based alloy components, demonstrating the potential of cBN-reinforced composite coatings for demanding tribological applications.

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