研究目的
Investigating the microstructural formation and wear performance of Cobalt and Nickel alloy powders cladding on steel 316L by Yb:YAG disk laser.
研究成果
The study concluded that Nickel-based clad surface showed higher wear resistance as compared to Cobalt cladding and substrate, attributed to γ-Ni rich matrix mixed with carbides-interdendritic borides. The wear mechanisms were identified as abrasive and adhesive. Nickel cladding exhibited significant reduction in roughness compared to Cobalt and unclad specimens.
研究不足
The study focuses on the comparison of tribological behavior of cobalt and nickel-based laser cladding on SS 316L using high power Yb:YAG disk laser. The limitations include the specific focus on these materials and the laser cladding method, without comparison to other surface modification techniques.
1：Experimental Design and Method Selection:
The study used a high power Yb:YAG disk laser for cladding Cobalt and Nickel based layers on 316L stainless steel substrate. The coatings were analyzed for phase characterization, microstructure, and hardness using X-ray diffraction analysis, electron microscopes, and microhardness tester. A tribo-test was performed using a ball-on-plate machine to analyze wear properties.
2：Sample Selection and Data Sources:
Commercially available Cobalt and Nickel based alloy powders were used as cladding material. 316L stainless steel was used as the substrate.
3：List of Experimental Equipment and Materials:
Yb:YAG disk laser (Trumpf disk laser-4002), X-ray diffraction analysis equipment, electron microscopes, microhardness tester, ball-on-plate tribometer, SEM, white-light interferometer.
4：Experimental Procedures and Operational Workflow:
The powders were deposited on the substrate metal with a track width of 3 mm, 6 passes and 50% overlapping to reach the thickness of 300 microns. The process parameters were optimized for good metallurgical bonding, lower porosity, good adhesion properties, and fine surface finishing.
5：Data Analysis Methods:
The observed patterns from XRD were analyzed using X-pert high score software. Microhardness was measured using Wolpert Wilson micro indentation examination. Wear mechanisms and surface roughness were analyzed using SEM and white-light interferometer.
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