研究目的
Investigating the microstructure and hardness of laser cladding using the mixed powder of nano-TiC and Ni-based alloy to improve the high-temperature wear-resistance of rope clamps used in super-high speed elevators.
研究成果
The cladding layer was composed of TiC, Cr3C2, Fe3C and Fe-Ni-Cr-C multielement solid solution. The hardness of the cladding layer increased with the increase of TiC content and scanning speed. Optimal results were obtained with 30% TiC content, laser power of 1.5KW, and scanning speed of 600 mm/min, producing a compact cladding layer with an average hardness of 701HV0.2.
研究不足
The study is limited to the analysis of microstructure and hardness of the composite coating. Other factors such as strength and high temperature resistance are mentioned as being tested but not detailed in the paper.
1：Experimental Design and Method Selection:
Laser cladding technology was used to prepare carbide reinforced composite coating on 45 steel matrix using nano-TiC powder and Ni-based alloy powder as cladding materials.
2：Sample Selection and Data Sources:
The mass percentages of TiC in mixed powders were 10%, 30%, and 50%.
3：0%. List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: LASERLINE LDF4000-1000 fiber-coupled semiconductor laser, KUKA KR 120 R2500 Pro six-axis industrial robot, Zeiss SUPRA 55 scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), and HXS-1000AY vickers hardness tester.
4：Experimental Procedures and Operational Workflow:
Single-channel cladding process was adopted with laser power range of
5：5-5 kW, beam diameter of 2 mm, and scanning rate of 300-600 mm/min. Data Analysis Methods:
SEM and EDS were used to analyze the morphology and energy spectrum composition of the samples, and vickers hardness tester was used to measure the hardness distribution.
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