研究目的
Investigating the mechanical and tribological performance of fiber laser cladded h-BN + SS316 composite on SS316 surface.
研究成果
The study successfully applied SS316 + h-BN composite coating on SS316 substrate by fiber laser processing, achieving good metallurgical bonding without cracks and pores. The coating exhibited enhanced mechanical and tribological properties due to the formation of intermetallic compounds. The micro-hardness of the composite coating was found to increase with an increase in h-BN content, and the coefficient of friction decreased significantly. The research concludes that the laser cladding of h-BN + SS316 composite on SS316 surface is a promising technique for improving surface properties.
研究不足
The study was limited to the effects of h-BN content and laser processing parameters on the mechanical and tribological properties of the clad surface. The research did not explore the performance of the coating under varying environmental conditions or long-term wear behavior.
1：Experimental Design and Method Selection
Laser cladding was used to apply h-BN + SS316 composite coating on SS316 substrate surface. The process involved varying laser power densities and scanning speeds to examine their effects on the coating's properties.
2：Sample Selection and Data Sources
SS316 substrate surface of size (25mm*25mm*5mm) was used. Commercial grade h-BN (purity > 99% of average particle size of 70 nanometers) and SS316 (purity > 99%, of average particle size 30-40 micron) powders were used as cladding material.
3：List of Experimental Equipment and Materials
Continuous mode fiber laser source (model No-SMS00051 make: SPI Lasers, UK), CNC controller (SIEMENS 828D), Vickers micro hardness tester (Model: Economet VH-1 MD, Make: Chennai Metco, India), Field emission scanning electron microscope (FESEM) (Model: Supra 55, Make: Zeiss, Germany), Micro Computed Tomography (Micro CT) setup (Make and model: GE phoenix v|tome|x, Germany).
4：Experimental Procedures and Operational Workflow
The blended powder was mixed with a solution of distilled water + polyvinyl alcohol (PVA) to prepare a paste, which was applied on the polished and cleaned SS316 substrate surface. The laser beam was panned over the preplaced powder layered surface with an overlap of 50%. The clad surface was sectioned using wire electrical discharge machining (WEDM) for characterization.
5：Data Analysis Methods
Micro-hardness was measured using a Vickers micro hardness tester. X-ray diffraction (XRD) technique was used for phase analysis. FESEM was used to study the microstructure and to do the elemental analysis. Micro CT test was conducted to find the volume percentage of pores in the clad layer.
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